Questions tagged [color-indexing]

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Gimp - How do you specify a maximum number of colors when using a custom palette?

In GIMP, when converting the color mode of an image into indexed, you are presented with the following dialog: When you let GIMP create the palette for you, you are able to specify the maximum number ...
0
votes
3answers
255 views

Non-contiguous stroke (pixels touching diagonally) in Photoshop

I need to make a few custom subtitle bitmaps for a DVD. The trouble is that DVDs support only 3 colours, which gives me one colour for letters, one for anti-aliasing and one for outline. What I've ...
1
vote
2answers
76 views

What is the most efficient (size-wise) lossless format to store 2 bit color depth indexed image, preferably in Gimp?

Using Gimp, I reduced an image to 4-colors indexed mode. I actually need only 3 colors: black, blue and white/background, but due to the 2^n constraint I went for black, white and 2 shades of blue. ...
0
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2answers
320 views

How can I apply Indexed colour to a large number of animation frames

I would like to create an animated gif from a number of frames in Indexed Color (or otherwise with a limited palette + dithering). However, changing the Mode to Indexed Color flattens the image. Thus, ...
1
vote
1answer
346 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 ...
3
votes
1answer
754 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 ...
8
votes
6answers
109k 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 ...
6
votes
3answers
2k 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
2answers
91k 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
420 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 ...