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Subject: Layer filtering through alpha channel?

shadowdragonlord opened this issue on Apr 17, 2003 · 5 posts
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shadowdragonlord ( ) posted Thu, 17 April 2003 at 8:51 PM · edited Sun, 02 February 2025 at 2:07 PM

This may be a silly question, but I'm trying to run effects on an image, and would like to base the strength of the effect on a grayscale "Alpha Channel" image. Is this possible? Either with the layers OR with filters themselves? I think it's the same effect one might use to blend wireframe-to-rendered images, for modeling? I'm using Photoshop 5... Does anyone know how to do this?

antevark ( ) posted Thu, 17 April 2003 at 9:29 PM

i've got a lot running right now, so I can't open PS, but try selecting the alpha channel(ctrl/cmd-click on alpha?) then using the filter. If the selection's the opposite of what you want, then inverse selection(ctrl/cmd-shift-i)

shadowdragonlord ( ) posted Thu, 17 April 2003 at 10:48 PM

No no, it's not really the selection I was after, what I mean is that can I tell Photoshop to apply the given effect in different levels, based off of the 8-bit grayscale image? Does this make any sense...?

antevark ( ) posted Fri, 18 April 2003 at 1:07 AM

have you tried masking?

antevark ( ) posted Fri, 18 April 2003 at 1:08 AM

layer masking, that is.

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