Alpha Channels (Alpha Channels) can be used to correct very, browse. to create meshes (marquees). Especially in conjunction with smooth transitions between transparent and robust use alpha channels, but what is it really?
An alpha channel is defined in black and white and is actually “invisible” information you can store a picture for you to use them afterwards.
An alpha channel does not have to be a black and white version of the photo Monday just looking; Actually, an alpha channel is completely different than the picture. As stated earlier, to use alpha channels to define the transparency, but we also use them to make selections / marquees. In conjunction with the mapping of 3D applications is also using alpha channels to define Specular & Highlights, bump & displacement, and much more.
Try it!
In Photoshop you can see the R (Red) G (Green) and B (Blue) channels by pressing the tab “channels” which stands beside the “Layers”.
Try to create a new channel by pressing the small “Create new channel” icon.
There is now a full black layer, called “Alpha 1″:
Character somewhere with a white brush – anything on this new layer.
Hold now CTRL on your keyboard while clicking on the alpha layer “Alpha 1″ with the left mouse button. As you note does the new alpha channel as a selection – where the variety is “not chosen” (no selection), white is selected (selection) and grayscale are partially selected. Your selections outline appears with an animated stiblet line.
Release the CTRL and select the top layer – it just says “RGB. "
Try. To run something “Brightness / Contrast” so you can see how it affects your image:
