Shader files for hue\saturation\brightness

Question

I am new to write a shader files(.fx), how can i write shader file to set hue\brigtness\contrast.

Answer 1

take a look at

• http://www.nathanm.com/photoshop-blending-math/
• http://mouaif.wordpress.com/2009/01/05/photoshop-math-with-glsl-shaders/

Answer 2

also see

• http://svetoslavsavov.blogspot.com/2009/07/using-gpu-accelerated-shader-effects-in.html