Fast branchless RGB to HSV conversion in GLSL

Some time ago I devised an original algorithm to convert from RGB to HSV using very few CPU instructions and I wrote a small article about it.

When looking for a GLSL or HLSL conversion routine, I have found implementations of my own algorithm. However they were almost all straightforward, failing to take full advantage of the GPU’s advanced swizzling features.

So here it is, the best version I could come up with:

vec3 rgb2hsv(vec3 c)
{
    vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
    vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
    vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));

    float d = q.x - min(q.w, q.y);
    float e = 1.0e-10;
    return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
}

Update: Emil Persson suggests using the ternary operator explicitly to force compilers into using a fast conditional move instruction:

    vec4 p = c.g < c.b ? vec4(c.bg, K.wz) : vec4(c.gb, K.xy);
    vec4 q = c.r < p.x ? vec4(p.xyw, c.r) : vec4(c.r, p.yzx);

And because a lot of people get it wrong, too, here is the reverse operation in GLSL. It is the algorithm almost everyone uses (or should use):

vec3 hsv2rgb(vec3 c)
{
    vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
    vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
    return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}

Porting to HLSL is straightforward: replace vec3 and vec4 with float3 and float4, mix with lerp, fract with frac, and clamp(…, 0.0, 1.0) with saturate(…).

  • Posted: 2013-07-27 15:23 (Updated: 2013-07-28 11:54)
  • Author: sam
  • Categories: glsl optim

Comments

1. jhincapie@gmail.com -- 2014-02-23 21:54

Hello Sam, thanks for the code. Do you have a similar GLSL snippet for RGB2HSL?

2. ian@chilliant.com -- 2014-04-23 23:23

Thanks for sharing the optimization, Sam. It really is very elegant. Though am I right in thinking there's a faster HSV-to-RGB? http://blog.chilliant.com/2014/04/rgbhsv-in-hlsl-5.html

@jhincapie: I've put HLSL snippets, including the RGB-to-HSL conversion, on http://www.chilliant.com/rgb2hsv.html

3. anonymous -- 2014-04-24 04:13

Thanks again for this. Just wanted to point out that obviously length(hsv2rgb(foo)) varies, so if you are accumulating the output (as I often do in some kind of glow effect), you'll notice that cyan, magenta, yellow, especially pastels, and of course whites are overexposed much sooner than mostly-saturated red, green, or blue. I work around this by normalizing the last mix before applying the gain, like so:

return c.z * normalize(mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y));
4. anonymous -- 2014-09-05 01:03

I am looking to manipulate only the v channel of an image and do not need to touch the h and s channels. So I only need the h and s to get back to RGB after modifying the v. I am wondering if there is a way in this case to save computation by not fully computing h and s and instead only compute enough information which can be combined with the updated v value to get back to RGB?

5. anonymous -- 2014-10-28 18:33

@anonymous -- 2014-09-05 01:03

If you need only V, why not just compute "max(r, max(g, b))"?

I doubt there is anything faster than that if you need nothing else.

6. anonymous -- 2014-11-13 23:14

@anonymous -- 2014-09-05 01:03

also if you don't need to know what V is before you change it, you can just multiply your RGB vector by a float to linearly scale it, then V is the only hsv-space component that changes (unless any RGB component goes out of range and gets clamped at 0 or 1, that *will* change H and/or S). Look at the last line of rgb2hsv(): c.z is the incoming V component, applied linearly to the intermediate RGB result from mix(). simplest part, really

7. anonymous -- 2014-12-02 21:05

P.S. I meant last line of hsv2rgb() not rgb2hsv(), sorry :( Also Anon.#5's answer is right, max(r, max(g, b)) is essentially the V extraction in sam's linked article about fast rgb to hsv. If you intend to increase V by multiplying then the maximum that will preserve H and S is 1/max(r, max(g,b)).

8. anonymous -- 2016-04-18 00:50

Thanks!

I need RGB 2 HSV but I only need the "VALUE". Is there way to do this with less code so to save a bit on computations?

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