Google needed foreign techies to figure out that less colors = smaller file

Re:Google needed foreign techies to figure out that less col... by neilk on Monday April 13, 2009 @01:15PM (#560050)

You have to find a limited number of colors that mostly approximates the original, to the human eye. This is how every GIF encoder works. Maybe there is something about your question that I am missing?

http://en.wikipedia.org/wiki/Color_quantization

I don't know what you mean by adapting it to Google's infrastructure. I think you meant to say "shared nothing". Tile serving is perfectly suited to such an architecture already. There's no shared state across tiles, for instance.

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Re:Google needed foreign techies to figure out that less col... by eugenejen on Monday April 13, 2009 @03:46PM (#560341)

I doubt naive gif encoder will do the job.

in http://en.wikipedia.org/wiki/Graphics_Interchange_Format it mentions:

"The algorithms used to select the palette and to perform the dithering vary widely in output quality. Additionally, dithering significantly reduces the image's compressibility and thus works contrary to GIF's main purpose."

So to goal is to get the best color palette that satisfies

1. The resulting image quality is close to original image,

2. The compressed image has to be smaller than original

3. The color quantization can be automated without too much human supervision.

I think the general color quantization algorithms may solve the point 1 and 3 but not necessary point 2.

Never mind, I am an idiot sometime.

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