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Re: Cross-developing artwork
On Sun, 25 Nov 2012, BLuRry wrote:
Best thing to do is make a custom gimp palette. Load a sample image
with all 6 colors and then convert it to an indexed color image (if it
isn't already) -- and make sure to limit the size of the palette to 6.
Once you have that, you can go to the palette menu and save it. It's a
bit tricky to find all the right menu options (the palette management in
Gimp exists but it's not easy to find for some screwy reason -- I think
I had to use an eyedropper and build a custom palette). You can then
apply this palette to other pictures as needed. If you're feeling
tricky you can do some optimizations like doing two 4-color palettes
(one with green/purple and one with blue/orange) and interleave the two
resulting images using layers and some creative masking tricks to
alternate so as to avoid the hi/lo color boundaries. This would help
you simulate the result without having to play guess & check.
I am not far away from having a better conversion routine to eliminate
the roundtrip through gimp for color conversion -- except that Java only
has a pattern diffusion and lacks a Floyd-Steinberg implementation (and
the FS dither yields WAY better results when reducing colors.) I found
some FS java implementations but the code was hard to read and wasn't
using the most optimal Java graphics classes (e.g. drawing points with
Java 2D instead of just touching the framebuffer directly, which is
several times faster.)
Anywho, if you're really crafty you can skip using Gimp and use Image
Majick "convert" to do (at least most of) this, but I imagine it may be
more bother than its worth. The advantage of using convert is that once
you have it, you just reuse the same script and you can apply it to a
stack of images rather quickly. I used Image Magick to do palette
conversions in the past as well as rescaling and gamma correction and
was very pleased with the results. I was not pleased that I was writing
a java program that offloaded half its work via a forked process though.
:-)
Well, I'm actually a fan of ImageMagick and use it a lot. :)
-uso.