How to get the alpha channel data information?

Thread View: adobe.photoshop.scripting

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2 total messages Started by Prabudass Mon, 16 Mar 2009 14:29

#201

Author: Prabudass
Date: Mon, 16 Mar 2009 14:29

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How to get the alpha channel data information. Sometimes alpha channel also contains data(information). So i need to know wheather the alpha channel contains data or not through scripting. Could you please advice me.

Re: How to get the alpha channel data information?

#202

Author: Michael_L_Hale
Date: Mon, 16 Mar 2009 19:13

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880 bytes

All channels contain data. You can tell if an alpha channel is black, white, or greyscale by the histogram.

For example if activeDocument.channels.getByName('myAlpha').histogram[0] == the number of pixels in the doc the alpha is all black. use histogram[255] to test for white.

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