Filter Forge - Wrong HSY Model documentation?

Sphinx.

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Documentation wrote: The HSY color model is similar to the well-known HLS model â€“ the H and S channels for a given color have equal values in both models.

In the attached image you see the difference blend of the saturation channels of the two models. As the blend result is not black, the two channels are not the same.

So how is the saturation channel of the HSY model constructed? (The link to the PDF article in the documentation is not working)

Njyldgarkn init/prepare process x no. of render blocks x no. of passes

Posted: December 7, 2008 6:39 am

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onyXMaster

Filter Forge, Inc.

Posts: 350

The HSY color model is similar, but not equal to HLS one. While the Hue component is the same, the two others are, in fact, completely different. The main purpose of the HSY color model is the elimination of interdependence between the "brightness" and "saturation" values.
As for original paper, please take a look at the HSY.pdf.

Posted: December 8, 2008 5:13 am

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Sphinx.

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Ah.. interesting paper. So you could really use any type of brightness channel in this approach (i.e. max RGB, weighted rgb, median rgb etc). Thanks

Njyldgarkn init/prepare process x no. of render blocks x no. of passes

Posted: December 8, 2008 6:15 am

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