32bit floats have a precision of 24bits*. The exact size of the ulps** (unit in the last place) in the range [0.0, 1.0] is more complex because the exponent will give you more precision as you approach 0. This gets even more complicated because actually doing any math most likely gives you some rounding error, e.g. the gamma conversions are not precise to 24bits but are to more than 16bits.
We have never done an error analysis of the entire gimp pipeline, but 16bits is already beyond human perception (in my unscientific opinion). The real value of using floating point is that it can hold out of gamut values. * https://en.wikipedia.org/wiki/Single_precision#IEEE_754_single-precision_binary_floating-point_format:_binary32 ** https://en.wikipedia.org/wiki/Unit_in_the_last_place _______________________________________________ gimp-developer-list mailing list List address: gimp-developer-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://gnome.org/archives/gimp-developer-list
