The code would be a little different in CIKernel
Slang, as texture coordinates are handled differently.
This code does a similar thing, in CIKernel slang:
kernel vec4 lut(sampler image, sampler LUT)
{
// Input pixel
vec4 inPix = unpremultiply(sample(image,
samplerCoord(image)));
// Output pixel
vec4 outPix;
outPix.r = unpremultiply(sample(LUT, vec2(inPix.r *
255.0,0.0))).r;
outPix.g = unpremultiply(sample(LUT, vec2(inPix.g *
255.0,0.0))).g;
outPix.b = unpremultiply(sample(LUT, vec2(inPix.b *
255.0,0.0))).b;
outPix.a = unpremultiply(sample(LUT, vec2(inPix.a *
255.0,0.0))).a;
// Output
return premultiply(outPix);
}
alx
--- vade <[EMAIL PROTECTED]> wrote:
> I would suggest creating a look up table as a
> texture, feed that in to
> a CIKernel, and have it map the r/g/b vales to the
> r/g/b values of the
> original image, something in GLSL like:
>
> // define our rectangular texture samplers
> uniform sampler2DRect tex0;
> uniform sampler1D tex1;
>
> // define our varying texture coordinates
> varying vec2 texcoord0;
> varying vec2 texcoord1;
>
> void main (void)
> {
> vec4 inputColor = texture2DRect(tex0, texcoord0);
>
> vec4 colorout;
>
> colorout.r = texture1D(tex1, inputColor.r).r;
> colorout.g = texture1D(tex1, inputColor.g).g;
> colorout.b = texture1D(tex1, inputColor.b).b;
> colorout.a = inputColor.a;
>
> gl_FragColor = colorout;
> }
>
>
> On Jan 15, 2008, at 10:10 PM, David Giovannini
> wrote:
>
> > Hello,
> >
> > Let me describe what I am trying to do a little
> better than before.
> > Every avenue I try comes up short.
> >
> > My daughter got a LEGO Mosaic set for Christmas. I
> am working on a
> > pattern maker application using QC. I have the
> pixellating and LEGO
> > impressions all working. The mosaic set comes with
> 12 colors where
> > three are black, dark gray, and white. I need to
> have the colors in
> > the resulting image limited to the 12.
> >
> > I keep trying to solve this problem using core
> image kernels and not
> > getting the results I am looking for. I keep
> looking for "grayish"
> > and attempting to find either the correct color or
> the correct gray.
> > There is nothing linear about the LEGO colors and
> "grayish" is very
> > subjective
> >
> > Given a set of 12 arbitrary colors, with fixed
> HBS, how would I
> > color match an image?
> >
> > Any thoughts would be appreciated.
> >
> > Cheers,
> > Dave
> >
> > On Jan 13, 2008, at 12:40 PM, Stephanie Giovannini
> wrote:
> >
> >> Hello,
> >>
> >> I am nearly done with a composition but I am
> stuck solving a color
> >> matching problem. I want to apply a palette of 12
> fixed colors
> >> (intensity, luminosity, saturation, etc all
> predetermined) to an
> >> image. The palette includes 3 greys. ColorMap
> seems to be close
> >> but not quite.
> >>
> >> What should I be using?
> >>
> >> Cheers,
> >> Dave
> >>
> >>
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