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Double-check selections before making alpha channels

Added on Sunday 22nd of June 2008 07:29 am EST
 
Application:
Adobe Photoshop CS/CS2/CS3
Operating Systems:
Microsoft Windows, Macintosh


I was editing an image and I saved a selection as an alpha channel. However, when I saved the alpha channel, the selected area displayed as black and the rest of the image displayed as white. I was expecting the selected area to display as white. Do you know why this happened and how can I fix it?

You’re correct in your expectations: When you save a selection as an alpha channel, Photoshop displays the selected area as white, and the non-selected, or masked area, as black. It sounds like you inadvertently selected the inverse of what you intended to select.
               This is a common mistake when you need to select an object that has a single-colored background, such as the racecar shown in Figure A. The easiest way to select the racecar is to select the white area, and then inverse the selection. However, if you select the white background, forget to inverse the selection, and then make an alpha channel based on your selection, the selected area will still display as white in the alpha channel, as shown in Figure B—it’s just not the selection you wanted.