> > Hi Ashi > > On Sun, Apr 08, 2012 at 10:18:48PM +0800, 阿四 wrote: > > Hi,all. > > I'm curious about how the indexed mode in gimp is implemented. Because I > > implemented a function which change a RGB colorspace image to indexed color > > image before, but my implementation is extremely slow. The algorithm is > > trivial, the runtime is about O(n^k), where n is number of pixels, k is the > > size of index. However, I tried indexed mode in GIMP on same image on same > > computer, it's really faster than my implementation. > > Could anyone give me some information about the indexed mode in GIMP? > > See this article (and the linked articles from there). Floyd Steinberg > is very simple to implement and has a linear runtime: > > http://en.wikipedia.org/wiki/Floyd%E2%80%93Steinberg_dithering > Mukund,thanks for your reply. However, dithering is not I want. I just want to know the pure index color. Best regards --ashi > > Kind regards, > > Mukund
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