Summary: It is my very strong opinion that values should not be clamped by default. If you are writing an operation (a "node") that is broken by negative or values breaks, do not clamp the input and output without carefully considering the possible impact on the entire toolchain. Very very carefully: Clamping values can have surprising side-effects (as the Blender community apparently discovered through experience). If it is likely that your operation will be fed, for example, negative values, try to write your operation so it does something sensible with them. Clamping should be a last resort. ----- Of course when you are dealing with specific color spaces you may know "what's what" and, for example, that negative values are totally meaningless. This business is almost as messy as dealing with the fact that colorspace handling is colored by "intent". I wish I had figured out a simple "Always do this and you'll be fine." or "Never do this and you'll be fine". GIMP is too complex an application for me to be able to make such pronouncements. And this question of "Shouldn't we clamp negative values?" is intertwined with colorspace conversion issues, which is really difficult to get just right in all situations without user intervention. Layers have meaning, colorspace are linked to intent and purpose, and automating processes based on hidden semantics is not trivial. _______________________________________________ gimp-developer-list mailing list List address: gimp-developer-list@xxxxxxxxx List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://mail.gnome.org/archives/gimp-developer-list
