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Old 31st March 2004, 02:02   #1
Junior Member
Join Date: Mar 2001
Posts: 29
Photoshop experts help, please!

I have a question about Photoshop, so I hope that the combined expertise on these forums can help me clarify my question!

My question has to do with transparency: where exactly is the transparency information of a particular channel or image stored? Most images have multiple channels, such as RGB or CYMK. In a Photoshop RGB image, there are three channels, each one cabable of containing 256 shades of red, green, or blue. I noticed that each channel also contains transparency information. This makes it seem like there is also some sort of hidden alpha channel or information that determines each channel's transparency. However, in a standard RGB image, there is no displayed alpha channel, even though individual layers, and even the image itself, can have transparency. How does this work--where is each layer or channel's transparency information stored?

The reason I have this question is because I'm creating images with alpha channels, and wondered how I could use photoshop's existing ("hidden"?) channel information to directly create an alpha channel. (clicking "select layer transparency", making a new channel, and filling the selection with white is my current method, but it is not 100% accurate)
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