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Possible problem with OctreeQuantizer?

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The OctreeQuantizer constructor checks if maxColors > 255 and maxColors < 2. Shouldn't the first be maxColors > 256?

In GetPalette, you invoke _octree.Palletize(_maxColors - 1); I think the unmodified _maxColors should be passed instead.

In a test case I made with a gradient, the GIF only saved with 254 colors and the PNG had 256 (reported by pngout).

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