What are the benefits of establishing channels? Thank you for your help.

Channel [Edit this paragraph] Computer vocabulary ① Data channel for transmitting information. ② Equipment for transmitting information and data in computer system. There are mainly main memory read-write channels and input-output channels. It can receive commands from the central processor, independently execute channel programs, and assist the central processor in controlling and managing external devices. (3) Up and down roads or stairs. A dedicated input/output control processor independent of CPU. The control device directly exchanges data with the memory. It has its own channel command, which the CPU can execute to start the channel and send an interrupt signal to the CPU at the end of the operation. The format of channel instruction generally consists of operation code, counting segment, memory address segment and end flag. A system can set three types of channels: byte multi-channel, array multi-channel and selection channel. First of all, the most fundamental difference between the channel layer and the image layer is that the attribute of each pixel in the layer is expressed by the numerical value of the three primary colors of red, green and blue, while the pixel color in the channel layer is composed of the brightness values of a group of primary colors. Let's talk about the popular point first: there is only one color with different brightness in the channel, which is a gray image. A channel can actually be understood as a mapping of a selection area. Channels were originally used to store selections and other information in image files. The well-known transparent GIF diagram actually contains a channel to tell the application (browser) which parts need to be transparent and which parts need to be displayed. Having said that, what can the channel do? For example, you have painstakingly sketched out some extremely irregular selection areas from the image, and these choices will soon disappear after being saved. At this point, we can use the channel to store the selection in an independent channel layer; When you need any options, you can easily call them from the channel. This function has been fully applied in the photo coloring example of special effects. Are you sure? You can save the selection as a different layer, but this is far less convenient than the channel. 4 bits, and the channel layer is 8 bits, saving as a channel will greatly save space; Most importantly, a multi-layer image can only be saved as a special format of Photoshop, and many standard image formats, such as TIF and TGA, can contain channel information, which greatly facilitates information sharing between different applications. In addition, another main function of the channel is to calculate and synthesize with the image layer, thus generating many incredible special effects. This function is mainly used for the production of special effects characters. In addition, there are many functions of the channel, so I won't list them one by one here, and then explain them in detail in the example operation. In short, the concept of channel is broad and profound, and it can't be said in one or two sentences. Need to be carefully understood in actual operation. _ _ _ _ _ _ _ _ _ _ [Edit this paragraph] Place name: Tongdao Dong Autonomous County is located in the southwest of Hunan, at the southern end of Huaihua City, adjacent to Chengbu in Shaoyang in the east, Liping County in Guizhou in the west, Jingzhou in the north, Longsheng Sanjiang in Guangxi in the south and the junction of six counties in Hunan, Guizhou and Guangxi. Shuangjiang county people's government. The county seat is 230 kilometers away from Huaihua and 0/95 kilometers away from Guilin/KLOC. The whole territory is 68 kilometers long from north to south and 53 kilometers wide from east to west. Now it has jurisdiction over 7 towns, 14 townships and 216,900 people, of whom the Dong people account for 73%. It is the earliest autonomous county in Hunan with Dong as the main body and Dong, Han, Miao and Yao living in harmony. Historically, the corridor separating Chu and Yue has been known as "the polar region of South Chu" and "the throat of Baiyue". Since 1956 established the county, the autonomous county has gone through more than 40 years, and has made great progress in all aspects of economy and society. The infrastructure is gradually improved, the transportation in Tongdao County is convenient, and domestic railways and highways extend in all directions. Liu Zhi Railway runs through six towns in the north and south, with several railway stations such as Tongdao, Yatunbao, Jiangkou, Tangbao and Xiangping, with a mileage of 44.3 kilometers, among which Yatunbao Station is the intersection of Guangzhou Bureau and Liu Ju Bureau. Highway mileage reaches 1 0,000 km. 209 national highway and 1.805 provincial highway pass through the territory from east to west, and all towns and 90% villages are connected with highways. Postal telecommunications and radio and television are developed. Ten thousand program-controlled telephones and mobile telephone service have been opened, which can reach all parts of the world directly; 32 sets of encrypted TV programs have been launched. The economy is growing steadily. The adjustment of agricultural structure has been gradually improved, and the development pattern of four major industries, namely bamboo and wood, animal husbandry, fruits and vegetables in mountain products and Chinese herbal medicines, has gradually taken shape. Industry has grown from scratch. Self-contained system, focusing on wood series processing, hydropower, building materials series, food series and agricultural machinery manufacturing, township enterprises have developed in an all-round way. And formed the economic belt along the "Road" (Liu Zhi Railway, 209 National Highway, 1805 Provincial Highway). Tongdao is a minority area where the Dong people live in compact communities, with splendid Dong cultural heritage and simple folk customs. Dong's unique architecture, embroidery and costumes are dazzling in the treasure house of Chinese culture and art, among which Drum Tower, Pavilion and Huaqiao are the most outstanding buildings, which can be called the "three treasures" of Dong architecture, and some of them have been listed as national or provincial cultural relics protection units; Dong Brocade and Dong Pa are the most famous embroideries. Tongdao Dong Township is known as the "hometown of singing and dancing", among which Pipa, Dong Opera, Dong Song, Duokouye and Lusheng are the most popular. The territory is beautiful, the scenery is beautiful, and there are miracles everywhere. There are 100 square kilometers of Danxia landform Wanfoshan scenic spot, which is praised by geographers as "the natural Great Wall of Wan Li"; Dilong has a well-preserved primitive secondary forest and 654.38+0 million mu of Songtao forest scenery; There is a unique rock peak that stands tall, comparable to Guilin's unique Xiufeng; There is Yangdongtan Waterfall, which "flies down three thousands of feet, and it is suspected that the Milky Way has fallen for nine days"; There are rich and colorful cultural landscapes here, such as the ancient buildings in Shantou Dong Village, which retain the original ethnic characteristics of the Dong people, the colorful "Baili Dong Cultural Corridor" with ethnic customs, the magnificent Martin Drum Tower, the magnificent and magical Baiyi Taoist Temple, the exquisite and chic Huilong Bridge, the simple and simple military bookstore, the magnificent Puxiu Bridge and the Xiaoshui Campaign Monument. All of them are antique and fascinating, and now they have become the latest tourist attractions. Among them, Shantou Dongzhai Ancient Architecture Complex and Matian Drum Tower have been listed as national key cultural relics protection units. The natural geographical passage is located in the transition zone from the eastern edge of Yunnan-Guizhou Plateau to Nanling Mountains, and the southwest remnant vein of Xuefeng Mountain extends in its territory, forming a terrain towering in the east, south and west, and slightly lower in the middle and north. The landform is dominated by mountains and hills, of which mountains account for 78%, hills account for 15%, and the altitude is generally 300-700 meters, with the highest 1.620 meters and the lowest 1.76 meters, mainly red soil and yellow soil. The origin of geological history of geological transformation channel can be traced back to Mesoproterozoic more than one billion years ago. According to geological data, it can be divided into three development stages: middle and late Proterozoic to early Paleozoic. In Mesoproterozoic, the territory was in the pre-Wuling period, and the plate subducted to form the geosyncline on the edge of the ancient geosyncline. At the end of the middle period of Late Proterozoic, the Xuefeng movement caused the geosyncline to rise in the Xuefeng period, and the Madiyi Formation and Wuqiangxi Formation were folded and fractured, with regional metamorphism, magmatic intrusion, diagenesis and mineralization, and the county was on the syncline, forming Wuqiangxi Formation deposits, including mineralization of copper, nickel, diamond, chromium, uranium and palladium. In the early Late Proterozoic Sinian, the county was in the stagnation and reduction environment of continental slope, and carbonaceous clay, sand inclusion, silt and carbonate lens were deposited. The early and middle Ordovician belongs to the continental slope environment of the South China Sea. Mesozoic is from late Paleozoic to early Triassic. It is an environment where straits and bays appear repeatedly, and it has experienced many transgressions and regressions. The early to late Early Carboniferous was a coastal environment, and the back crust was confined to shallow platform environment and shallow platform basin. & lt Third, from Late Triassic to Cenozoic in Mesozoic. After Anyuan Movement at the end of Mesozoic Triassic, the whole county reached Huaihua and the whole province built mountains and land, ending the history of transgression. After the Early Cretaceous, some depressed basins deposited continental red formations under the hot and semi-arid subtropical paleoclimate, which is now called Danxia landform. Stratigraphic distribution channel is located in the transition between Yangtze paraplatform and Nanling geosyncline, with complex geological structure, overlapping folds, vertical and horizontal faults and extensive stratum exposure. Branches: Banxi Group, the oldest stratum, distributed in the southwest, mainly exposed in towns such as Boyang and Dupo; Wuqiangxi Formation, distributed in the south of the county seat, is widely exposed in urban and rural areas of Gansu. According to the lithologic combination, it can be divided into four lithologic stages: metamorphic sandstone and conglomerate, metamorphic tuff, banded slate, metamorphic sandstone and slate; Sinian system is distributed in north-central, east and north-central, with wide distribution range, large sedimentary thickness and complex lithologic combination. The general trend is from north to south, and the thickness changes from thin to thick; Cambrian, reflecting the transition from Taiwan area to trough area, exposed in the eastern part of the county, distributed in northeast belt; Devonian, located in the southwest of Cambrian in this county, is distributed in a strip shape, and it is not large in western Jiangxi, Longcheng, Malong and rural areas. Triassic, Jurassic and Cretaceous distributed sporadically. In the eastern part of the county, there are obviously Cretaceous purple sandy argillaceous rock formations along the line from Huangbai, Zhongtuan to Shanmuqiao Longtang, forming a unique "Danxia" landform; Tertiary, sporadic exposure, limited to Paleogene Paleocene and Miocene, lacking Eocene, Oligocene and Pliocene; Quaternary, mainly distributed in canal water and tributary valleys, small mountain basins, mainly alluvial materials. The county boundary of geological structure channel is located in the south section of Jiangnan axis, the transition zone between Dongtai Oblique in Caledonian and Yanshan Platform Fold Belt, which can be divided into two geological structure units according to the main formation period of the structure. ① Syncline, anticline and a series of composite anticline structures formed by folds. From east to west: Tongchang Street compound syncline, located in Liuzhou, from Liuyuan to Shuikou, Suining County, with a distribution length of 48 kilometers and a width of 9 kilometers. Due to the destruction of Longcheng fault, its shape is incomplete; Xikou compound syncline is located in Guangxi Shuituan, Shantou in the county, Xikou to Lanjia in Suining County, with a length of 75km and a width of10km. The center of syncline is Sinian system, and the strata are sandwiched with Cambrian sandstone shale. The two wings are Banxi Group strata, which were broken by a series of NE-trending thrust faults. Egongling anticline is located in Jinkeng, Jingwuzhou and Egongling. It is 30 degrees from east to west, 50 kilometers long and about 5 kilometers wide. The anticline is well preserved, the bedrock on the shaft is not seriously damaged, and the fault is not developed. The whole anticline is composed of Proterozoic Banxi stratum, which intrudes into basic rocks locally, forming Zhongshan and middle-low mountains. Diyangping syncline consists of Santuan syncline, Pailou syncline, Longlin syncline, Chaxi syncline, Bao Li syncline, Yangjia syncline and Guantuan syncline from south to north. Generally, it extends from 30 degrees north latitude to 40 degrees east longitude, and faults are developed, forming low mountains and medium-low mountains; Huangbai syncline is located in Shuangjiang, Huangbai, Zhongtuan and Longdou, extending 30 degrees from north to east, and is composed of Cretaceous purple sandstone, forming a unique "Danxia" landform. (2) Fault zones, all over the county. The east-west main fault is Longcheng deep fault, which extends northward from Luoweng through Suining to Longcheng and enters Guangxi, and the county is18 km long; Tuantou deep fault belongs to a section of Xupu-Tuantou deep fault, which coincides with Anhua-Liping deep fault in the north, and extends into Guangxi through Tuantou in the south, in a northeast direction; Zhongtuan fault, 60 kilometers long, striking southwest-northeast; Jinkeng fault is 90 kilometers long and extends from southwest to northeast. Where the fault passes, the bedrock often breaks to form deep ditches and deep valleys, which are distributed in belts among the mountains, which is the basic framework of the regional structure of the county and lays the foundation of modern landscape. Geomorphological features The mountains are winding and the terrain is undulating. The mountainous area of the county accounts for 77.67% of the total land area of the county, and the altitude is generally between 400 and 800 meters. The highest peak is the mud world (cowhide world) at the junction of the east and Chengbu, with an altitude of1620m. The lowest point is the big fish pond at the exit of Qushui River to the north of the watershed, with an altitude of 305 meters; The elevation of Xinhe Estuary in Pingyang Township south of the watershed is only168m. The main mountain ranges are basically consistent with the regional tectonic direction, extending in the northeast-south-west direction, with vertical and horizontal valleys and steep slopes, and the mountainous areas often remain multi-level peeling surfaces, showing mountainous characteristics. The central and northwestern parts of the county are low-lying, with an altitude of 300-500 meters, which are low mountains, hills and river valleys; The terrain south of Badoupo is steep, with high mountains and deep valleys; The eastern terrain rises strongly, with an altitude of more than 800 meters. There are 82 peaks at an altitude of 1000 meters, which constitute a magnificent natural barrier. The three provincial slopes in the southwest, Jiangjunpo, Dashan, Taiping Mountain and Dingqing Mountain in the north are all above 1000 meters above sea level. Second, there are hills, hills and flat land, and Danxia landform is unique and diverse. Due to the long-term repeated geological tectonic movements and the influence of external factors, the landforms in the county are complex and diverse, with mountains accounting for 77.67%, hills accounting for 15.39%, hills accounting for1.965,438+0% and flat land accounting for 3.08%. There is also a special landform type-"Danxia" karst landform. Danxia landform is mainly distributed in the area from Shuangjiang to Taiping Rock in Linkou, with an area of *** 168 square kilometers. There are many types of natural sculptures, mainly including wedge landforms, block landforms, wall landforms, linear landforms and columnar landforms. Various combinations are orderly distributed, relatively concentrated according to a certain spatial area, with dense vegetables and dense combinations of sub-vegetables, which are unique and very high. < third >, strong surface shear, large fluctuation frequency. The county is criss-crossed with valleys, dense water network, strong river cutting and high surface cutting density. Due to the imbalance of neotectonic movement and the multi-cycle influence of crustal movement. In addition, the lithology of each water basin is different, which makes the landform of each valley different. On the general terrain trend, the ridges and valleys and the basins and mountains are staggered or interdependent, which not only reflects the horizontal ups and downs, but also has vertical gradient levels. From the watershed to the valley, or from the basin to the middle of the basin, from high to low, the cutting depth is: Zhongshan 600- 1 100 meters, middle and low mountains 400-600 meters, and low mountains 200-400 meters. Multi-level intrusion, melting, stripping and river cutting are common in this county. Because it is located in a mountainous area with abundant precipitation, the vegetation is well protected, the water is rich, the water quality is neutral fresh water, and the sediment content is less. Huangzhushan Huangzhushan is located at the junction of Mujiao Township and Chengbu County, with an altitude of1740m (the main peak is in Chengbu). Mud mud is named because it is close to mud. It is located in the key area between shangdong village in the east of Linkou Town and Chengbu Miao Autonomous County, about 1 1 km away from the town government. The mountain range is southwest-northeast, about 5 kilometers long, and the main peak is 1620 meters above sea level, which is the highest elevation in the county. Chang Da Ping, a robber in the plain, is also known as Xiang Taoping. Located at the southeast end of Xiaxiang Township, about 1 1 km away from the township government. Near the border of Pingxiang, Longsheng County, Guangxi, it runs northeast-southwest and is about 10 km long. The elevation of the main peak is1548.8m, which is the second highest peak in Tongdao County. Daguangjie Daguangjie is located at the junction of Mujiao Township and Suining County with an altitude of 1346 meters. Sanshengpo is located in the southeast of Dupo Township, about 10 km away from the township government. It is named after its border with Liping County of Guizhou Province and Sanjiang Dong Autonomous County of Guangxi Province. Northeast-southwest trend, belonging to three uplift zones of Neocathaysia. It is mainly composed of Sinian gravelly slate and gravelly sandstone, and its main peak is1337m above sea level. It is the watershed between canal water and Liujiang River. There are many arrows on the top of the mountain and many natural secondary forests and broad-leaved trees on the mountainside. There are mushrooms, auricularia auricula and a variety of precious medicinal materials here, and there have also been precious animals such as musk deer, bears and golden roosters. Before liberation, due to the separation of warlords and gentry, the land was located at the junction of three provinces, with high mountains and dense forests. It is called "the land where the three provinces are divided" and is often used by the poor to avoid debts and men. After liberation, the old look took on a new look. People of all ethnic groups in the three provinces bordering Hunan, Guangxi and Guizhou have built "Unity Reservoir" under the slopes of the three provinces, and many touching stories of national unity have emerged. 1973, People's Daily published the article "Unity Flowers Bloom on the Hillsides of Three Provinces". Yanchong Yanchong is located at the northeast end of Mujiao Township, about 1 1 km away from the township government. It is about 2 kilometers long and its main peak is 1282 meters above sea level. Wujiashan Wujiashan is named after its proximity to Wujiaao in Shangdong Village. Located in the southeast of Linkou Town, about 9 kilometers away from the town government. The mountain is east-west, about 2 kilometers long, and the main peak is 1252 meters above sea level. Three ridges have three natural hills, hence the name. Located at the southern end of Shanmuqiao Township, it is 3 km away from the township government/kloc-0. The mountain range runs from northeast to southwest, about 2 kilometers long, and the main peak is 1220 meters above sea level. The skyscraper is located in the east-northeast of Mujiao Township, 8 kilometers away from the township government. The mountain runs in the north-south direction, about 2 kilometers long, and the main peak is 1 146. 1 meter above sea level. The mountain is high and big, with the main peak at an altitude of 1077.9 meters. Located in the southeast of Dagaoping Miao township, it is east-west and about 4 kilometers long. Clear sky Wan Li climbs the main peak, overlooking the north. The winding canal water extends northward like a silver belt, and the Dongjiang area in Jingzhou County is faintly visible. Wanfoshan scenic spot in the northeast of the county has a panoramic view of all kinds of peak forests. It is refreshing to look around, and the permanent leveling point of the national geodetic mark has been built on the flat ground of the peak. Badoupo Badoupo is located in the south of Longcheng Town, about 4 kilometers away from the township government, and consists of 8 bucket slopes. The mountain runs from north to south, about 2 kilometers long, and the main peak is 935.6 meters above sea level. It is the dividing line between the Yangtze River and the Pearl River. The water collected on the southern slope of the mountain range is injected into the Jiangxun River, a tributary of the Pearl River system, and the water collected on the northern slope is injected into the branch canal water in the upper reaches of Yuanshui River in the Yangtze River system. Now there is a county microwave TV differential transfer station. Fog beam Fog beam Dong called, beam is a mountain beam. Mongolian is fog in Dong language, which means mountain. Dawuliang is located at the junction of Didiao Village in Dagaoping Miao Township and Meng Chong in Huangbai Village at the junction of Hunan, Guangxi and Guizhou provinces (regions), with an altitude of 890 meters. Daqiuliang is not a famous mountain, but since ancient times, it has been famous for thousands of young men and women from the border areas of Hunan, Guangxi and Guizhou on the first May Day of the third lunar month every year. Therefore, fog light beam is also called big beam. Wanfoshan Wanfoshan is located in Taipingyan Village, Linkou Town, 20 kilometers from Chengshuangjiang County, with an altitude of 597.9 meters. The whole mountain is a big stone mountain composed of purple gravel, which is triangular, beautiful and elegant from a distance and magnificent from a close look. From the foot of the mountain to the top of the mountain, the steep place has a slope of 90 degrees. There is a temple site halfway up the mountain, which is said to be the former residence of the seventy-two nunnery elders who presided over the main circle. 1996, the county tourism bureau chiseled stones along Beiling, opening up a tortuous cement ladder path leading to the top of the mountain. The top of the mountain is densely covered with vegetation and the ground is flat. Standing on the top of the mountain, you can see the Wanshi Peak and the magical scenery of Danxia landform. There are two popular sayings about the origin of Wanfo Mountain: First, Wanfo Mountain is surrounded by forest-like stone mountains, just like a pilgrimage to Wanfo Mountain, hence the name; 2. On the rock of Wanfoshan, because the parent rock of Shifeng is purple gravel, after long-term weathering, tens of thousands of Buddha statues with strange shapes and different sizes have been formed on the stone wall, so it is called Wanfoshan. Qingyun Mountain Qingyun Mountain (Du Yan) is located one kilometer south of Shuangjiang, the county seat. Only a few dozen stone mountains have risen from the ground, and the stone mountains are towering and steep, vying for the glory. The highest rocky mountain is called Du Yan Peak, with a middle diameter of about 100 m and a peak elevation of 602 m, which is similar to the Duxiu Peak in Guilin. People who have been to Shuangjiang are amazed at Du Yanfeng's tall and straight posture. The predecessors praised it as "unique rock is beautiful" and it is one of the famous scenic spots in Tongdao Dong Township. At the foot of the solitary rock peak, the stream is gurgling and the flowers are overflowing. There is a cave on the cliff at the foot of the mountain, which can accommodate hundreds of people. Once upon a time, there was a Buddhist temple at the entrance of the cave. There are many doors in the Buddhist temple. Every time you open a door, you can see a bodhisattva. After the Third Plenary Session of the Eleventh Central Committee, the religious policy was implemented, and the masses donated money to build a new Buddhist temple-Qingyun Temple. Every holiday, people often visit it, which is a tourist area in the suburbs of the county. There is an interesting legend about the origin of Du Yanfeng: During the Hongwu period of the Ming Dynasty, the Dong people, under the leadership of Wu Mian, launched a peasant uprising against oppression and exploitation and occupied Liping, Tongdao and Jingzhou. Ming room was frightened and sent to be brutally suppressed by heavy troops. Wu Mian was very weak, so he turned the Rocky Mountains around Guilin into a pigsty to stop Ming soldiers. When I arrived in Shuangjiang, I was caught by a woman. You Zhu became the Rocky Mountain, and one of the sows became the Gufengyan. Wu Mian, who was anxious and angry, slapped the woman in the face and pulled back her hair, so now the hair of Dong women in the corridor is pulled back, unlike that of Dong women in Guizhou. Qixing Mountain Qixing Mountain is located in Guantuan Village, Linkou Town, which is 0/0 km away from Wanfoshan/Kloc. Like the Big Dipper, this mountain has seven peaks, and the main peak is 567 meters above sea level. Tang and Song Dynasties were Buddhist resorts. According to legend, in ancient times, seven birthday stars descended to play chess on the slate at the top of the main peak. A shepherd boy passed by, fascinated by watching the birthday boy play chess. It has been seven years since he came home. Later, people called this main peak Qixing Mountain. In order to commemorate the descent of the Seven Stars, the ancients built an Antang on the mountain and named it Qixing Temple. Antang is famous all over the world for its exquisite architectural structure and exquisite craftsmanship, and it used to be a heyday of incense. It is said that it was rebuilt in the 20th year of Qing Daoguang, Xianfeng 10 and Tongzhi 10. There are lush fruit trees and lush green trees around Antang, with quiet environment and beautiful scenery. There is a gazebo on the mountainside, and there are Seven Stars Well, Seven Star Altars and Stone Columns on the top of the mountain. To climb Qixing Temple, you have to climb 998 steps and pass two Qixingzhai gates. The road is steep, so people can't get in, and they are guarded by one person. Goutoushan Goutoushan is located in the northeast corner of Shanxi Village, Linkou Town, at the junction of Xiaxianglinkou and sanxiang town, Jingwuzhou in the east of the county, with an altitude of 623.9 meters. The mountain is steep and looks like a running hound. Standing on the top of the mountain and looking down, I saw Fiona Fang dozens of miles away, with rolling mountains and boundless forests, just like a green ocean with rolling waves. Although the altitude of Goutou Mountain is not high, it is surrounded by dense forests and easy to hide, which has always been valued by military strategists. The Taiping Army led by Shi Dakai once fought here, destroying several military camp cards. The Chinese Red Army of Workers and Peasants passed through here on the Long March. 1949 After Chiang Kai-shek fled Taiwan Province Province after the defeat, it was regarded as the key area for air dropping and airborne. 1952 sent planes to drop a large number of reactionary leaflets in this area. 1953 In April, Hunan Military Region and Qianyang Military Division of China People's Liberation Army set up a key air defense post in Goutou Mountain, which was guarded by the public security forces of Tongdao County of China People's Liberation Army. 1955 After the reorganization of the public security forces, the defense was taken over by the waterway detachment of the Chinese People's Armed Police Force. 1978 was revoked. During the period when the troops were stationed, there were 250 alarms, including 3 attacks by enemy planes and 247 fires. Because the alarm was accurate and timely, it quickly hit the invading enemy, put out the mountain fire and defended the safety of people's lives and property.