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What is Alpha Mask?

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The alpha masks are just simple images, most of the times black and white and they are used to set the alpha value of the image you're working on. let's start with one pixel, the first of both your original image and the mask: let's say your original image's alpha value is 255: not transparent and the average of red, green and blue of the mask's image is 0, the alpha value of the first pixel is set to 0. Then the same is done with the next pixel.

Short version: Alpha value=(mask's red value + mask's green value + mask's blue value)/ 3

To use an alpha mask you download the alpha mask plugin (search) and save an image you want to be your alpha mask, then in your other image you use the alpha mask plugin with your mask and press the ok button.


History repeats itself, because nobody was paying attention the first time.

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