How to change hue of a texture with GLSL?

Question

Is there a way to efficiently change hue of a 2D OpenGL texture using GLSL (fragment shader)?

Do someone have some code for it?

UPDATE: This

Answer 1

Andrea3000, in comparing YIQ examples on the net, i came across your posting, but i think there is an issue with the 'updated' version of your code.... i'm sure your 'mat3' definitions are flip/flopped on the column/row ordering... (maybe that's why you were still having troubles)...

FYI: OpenGL matrix ordering: "For more values, matrices are filled in in column-major order. That is, the first X values are the first column, the second X values are the next column, and so forth." See: http://www.opengl.org/wiki/GLSL_Types

mat2(
float, float,   //first column
float, float);  //second column