Adobe Photoshop CS3 Tutorials
Channels / The Channels Palette
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Subtitles of the Movie (Adobe Photoshop CS3 / Channels / The Channels Palette)
Photoshop CS3 works in what are known as channels when it comes to combine your image in a composite like this. Now when you're working in Photoshop behind the scenes you have this guy right here that's keeping track of what pixels live in what channel. The best way to think of a channel is that each one of these sheets here or channels is what contains the pixels that Photoshop needs to create the final image. For example when I click on the red channel we are looking at greyscale right? But these pixels when Photoshop finally gets to putting your image together will be filled with red. These pixels on this layer are going to be green and these pixels are going to be the blue pixels and then when its put together in RGB, which is red green and blue Photoshop is gonna give you this composite. So think of it this way as well it's like when you go to the printer I'm gonna go to image mode and I'm gonna go to CMYK color. When you go to CMYK what's happening is you are giving your printer a color image like this for your book cover or whatever it is. Let me tear this off real fast and show you. And what your printer is going to do is he's going to take some put it on his plates and one plate is going to be the one where the cyan ink hits and think of cyan as kind of blue OK. So when the the drum is spinning like this OK the drum is spinning and your image is going to go through and cyan is going to cover this plate with blue and then it's gonna go through again and this time the ink that's going to hit the drum or the plate is going to be magenta cause we're gonna go through again and this ones gonna be the yellow pixels and then it's going to add the black. Once all these have been combined your book cover is finished. So Photoshop in essence is actually a greyscale editor which then takes the images pixels from these channels and then once it's done it combines them to give you your final composite. So another we're going to talk about later on is how to create an alpha channel which is kinda like a special channel that contains transparency information which is useful for masking out parts of the images you don't want to see and you want to somehow manipulate and and with a filter or a special affect. So once again just to reiterate a channel is a layer that for all intents and purposes contains greyscale information that will represent when it's done the pixels that will take up that color. So this will be cyan, magenta, yellow, black and when combined it gives you CMYK or RGB.
Tutorial Information
| Course: | Adobe Photoshop CS3 |
| Author: | Dwayne Ferguson |
| SKU: | 33782 |
| ISBN: | 1-933736-98-4 |
| Release Date: | 2007-08-02 |
| Duration: | 9 hrs / 161 lessons |
| Work Files: |
Yes |
| Captions: | No |
| Compatibility: |
Vista/XP/2000, OS X, Linux QuickTime 7, Flash 8 |
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