What is a "fixed-point float"? That sounds like a contradiction.
And what sort of transfer function are you referring to?
And what sort of transfer function are you referring to?
Transfer function is the nonliner transformation used to more effectively use the limited resolution of integer values. Most typical is sRGB gamma (luminance ~ (value / 255) ^ 2.2) or Perceptual Quantization (PQ, smpte2084) for HDR videos. If you want to perform filtering in linear domain (i.e. for your color transformations to look natural) you need to linearize the signal.