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  • Numbers 2 and 3 are absolutely true if you've correctly implemented your HLS or HSV conversions. Is it possible that the feColorMatrix filter uses radians instead of degrees?
    – user1118321
    Commented Oct 5, 2013 at 2:13
  • 2
    No, since rotating feColorMatrix by 360 indeed yields the original color. Rotating twice by 180 doesn't, as shown in the example. The difference is much larger than a simple rounding error, in both webkit-filters and SVG filters
    – Maros Urbanec
    Commented Oct 5, 2013 at 6:53
  • So I took the image made by your code into an image manipulation program, and what I'm seeing is that the hue is correct on all the color swatches, but the saturation and value (or luminance if you prefer) are not correct. In order to get them to match, I had to turn the saturation up from 1 (meaning no change) to 3, and the value down to about 0.6. Then the swatches mostly matched. So it looks like the issue isn't the hue, but the other two channels, from what I can tell.
    – user1118321
    Commented Oct 5, 2013 at 14:04