Comments on: Image Filter Theatre: HSB Mixer http://www.losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/ smarter than your average squirrel, on most non-acorn related topics Mon, 08 Sep 2008 06:49:29 +0000 http://wordpress.org/?v=2.5 By: Ahruman http://www.losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/#comment-24367 Ahruman Tue, 02 Oct 2007 20:21:09 +0000 http://www.losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/#comment-24367 Never mind, I found my answer. :-) Never mind, I found my answer. :-)

]]> By: Ahruman http://www.losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/#comment-24366 Ahruman Tue, 02 Oct 2007 20:05:49 +0000 http://www.losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/#comment-24366 I came here by searching for cikernel HSVRGB conversion code. You’ve got just what I was looking for. Unfortunately, no license appears to be specified…? Incidentally, the behaviour people are likely to expect from this type of filter can be achieved by changing the clamp line for the h channel to: hsvPixel.r = mod(hsvPixel.r + inputHue, 6.0); Then again, the standard Hue Adjust filter already does this. “Notice that the vec4 data type always assumes rgba…” You can also refer to the components as xyzw or stpq. I’ll be using xyz and a to avoid confusing HSV and RGB values. I came here by searching for cikernel HSVRGB conversion code. You’ve got just what I was looking for. Unfortunately, no license appears to be specified…?

Incidentally, the behaviour people are likely to expect from this type of filter can be achieved by changing the clamp line for the h channel to:
hsvPixel.r = mod(hsvPixel.r + inputHue, 6.0);
Then again, the standard Hue Adjust filter already does this.

“Notice that the vec4 data type always assumes rgba…”
You can also refer to the components as xyzw or stpq. I’ll be using xyz and a to avoid confusing HSV and RGB values.

]]> By: John C. Randolph http://www.losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/#comment-3640 John C. Randolph Fri, 26 Jan 2007 15:43:50 +0000 http://www.losingfight.com/blog/2007/01/25/image-filter-theatre-hsb-mixer/#comment-3640 FYI, you can also try out your GLSlang code in a "Core Image Kernel" patch in Quartz Composer. Can't beat that immediate feedback! -jcr FYI, you can also try out your GLSlang code in a “Core Image Kernel” patch in Quartz Composer. Can’t beat that immediate feedback!

-jcr

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