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1
vote
1answer
29 views

Use specific color map index as transparent in a .gif file

Is there a way of setting the color to be used as transparent in a .gif file to a specific index in the color map? I have tried ImageMagick. For example, if I want to make all red in the image to use ...
2
votes
1answer
137 views

Generating 8-bit versions of images

I want to generate decent-looking 8-bit versions of existing images for a project I am working on. The current method I am using involves changing the mode of the image to Indexed Color with the ...
3
votes
4answers
15k views

How do I set a Photoshop image to just pure black and white, no grayscale?

i'd been googling for answers for this, all guides point me to make it grayscale, but actually it is still not enough, it still allows non-black(gray gradient). What I want is Suppose I ended up ...
4
votes
3answers
317 views

Why can I create layers, but not layer groups in the indexed color mode in gimp?

I'm making some pixel art in gimp and I so I figured I should use the indexed color mode since I won't be using very many colors. About halfway through my project I realized that I wanted to be able ...
1
vote
1answer
37k views

How to change index image to background image in Photoshop

I have recently opened some images and in the layers palette, instead of saying "background" it says "Index". I have been unable to figure out why it says "index" and cannot do anything to the image ...
4
votes
3answers
294 views

Should I scale an image first, or index it?

I have an image, it's the Backtrack_5_PitchBlack.jpg found at http://www.backtrack-linux.org/screenshots/, and I'd like to get it down to 640*480 for a Grub4DOS splash screen. Unfortunately, this also ...