On Mar 6, 1:49 am, Robert Bradshaw <rober...@math.washington.edu> wrote:
> We're talking about adding and scaling colors here--there arguably > isn't a "right" answer here, though we do want what we do to be good > and consistent, and it is documented what it does. That is probably true, but surprisingly, there are "wrong" answers. There are good arguments to be made that the average of 2 colors should be defined such that a dither pattern of two colors is perceived as the same color as their average. Apparently, the RGB values of a picture are purposely not interpreted in a way that is perceived as "linear", and different choices are made for different pictures (the gamma value). That means that averaging colors is not just the arithmetic mean. some entertaining illustrations: http://www.4p8.com/eric.brasseur/gamma.html As far as I can see, arithmetic of colors has not been implemented, but if someone does that, it would probably be good to take the gamma value into account. -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
