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Posterize or make contour lines by defined colours
#5
Again using indexed mode, slightly different to above:
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Not much you can do with that image. First lose the border, It does not help. You can put it back later.

Screenshots for reference - all in Gimp 2.8 https://i.imgur.com/yGbbi5O.jpg

1. Convert to indexed mode with 6 colours. Image -> Mode -> Indexed

that gets just 6 colours but the border are a bit 'jagged'

2. Back to RBG mode Image -> Mode RGB the apply a Gauusian blur - quite strong about 20

3. Repeat stage 1 Image -> Mode -> Indexed with 6 colours. That smooths the borders a bit. If you want to change any of the colours, edit the colormap

Then if you need to back to RGB mode, you will still have just 6 colours.

I did look around for suitable scripts or plugins but nothing much different to changing the colour mode
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RE: Posterize or make contour lines by defined colours - by rich2005 - 06-19-2020, 05:13 PM

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