What's wrong with this RGB to XYZ color space conversion algorithm?

Question

My goal is to convert an RGB pixel into CIELab color space for some special calculations only possible in CIELab. For this, I must convert RGB to XYZ first, which is the rea

Answer 1

I believe here is your problem, this is truncating to an integer:

CGFloat var_R = (*inR / 255); //R from 0 to 255
CGFloat var_G = (*inG / 255); //G from 0 to 255
CGFloat var_B = (*inB / 255); //B from 0 to 255

Try this:

CGFloat var_R = (*inR / 255.0f); //R from 0 to 255
CGFloat var_G = (*inG / 255.0f); //G from 0 to 255
CGFloat var_B = (*inB / 255.0f); //B from 0 to 255

I haven't checked the rest of the code for other problems.