Indexed mode is reducing image to only 2 colors

Question

I created a new palette in gimp using my original RGB image (containing shades of yellow and black) which gave me about ~200 colors (with interval=2 in Import dialog). Then I changed the mode from RGB to Indexed using the palette I created above, but the resulting image contains only 2 colors - black and yellow. All the dark-greys, light-greys and different yellows are absent.

I want my indexed image to resemble the RGB as much as possible but the result looks disastrous. Please help.

Visual illustration of my problem : http://i49.tinypic.com/w1tchw.png

score 1 · Accepted Answer · answered Jul 13 '12 at 18:15

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Judging by the original image, it looks like you're working with layers where the top layer is a greenish yellow and the bottom layer is black, and the shapes and patterns are defined by their transparency. You would need to combine the two layers into one. I'm afraid I don't know Gimp so I can't give specific instructions.

answered Jul 13 '12 at 18:15

Mark Ransom

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You were right, there were just two colors with varying transparency as opposed to multiple shades like i had assumed. I had to 'flatten' the image to proceed, which worked. Thanks for the insight! – soundswaste Jul 14 '12 at 11:47

score 0 · Answer 2 · answered Jul 13 '12 at 17:54

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When converting to Indexed Mode select a Dithering option.

answered Jul 13 '12 at 17:54

pmoleri

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That's just going to give you a pattern of the same 2 colors, isn't it? – Mark Ransom Jul 13 '12 at 18:10
Yes, that gives just 2 colors again. The problem was the alpha channel. – soundswaste Jul 14 '12 at 11:49

Indexed mode is reducing image to only 2 colors

2 Answers2