On Sun, Jan 24, 2016 at 10:25 PM, Simon Fraser <smfr@me.com> wrote: > > On Jan 23, 2016, at 9:37 pm, Rik Cabanier <cabanier@gmail.com> wrote: > > On Sat, Jan 23, 2016 at 10:23 AM, Simon Fraser <smfr@me.com> wrote: > >> >> This has been discussed several times in the past; we all agree that >> interpolating in non-premultiplied colors >> is better, but this is not supported by the graphics frameworks on some >> platforms (e.g. by CoreGraphics on Mac) >> so the spec is not able to mandate it. >> > > You have it reversed. The graphics frameworks in the browsers all > interpolate in non-premultiplied data. I had to add emulation code to all > the browsers to make this happen. > > > Are you sure? > Yes, I am sure. Although it looks like I forgot to add the emulation code to Safari If you open this in Safari: https://jsfiddle.net/2ff05z2y/ you will see that the gradient is not in premultiplied space. > Gradients with a transparent endpoint in Safari look grayish near the end, > because alpha premultiplication has caused loss most of the RGB > information. We need to interpolate with non-premultpliied alpha to be able > to interpolate the color components and the alpha independently. > Yes, they are gray-ish because the interpolate with transparent black. Transitions should interpolate alpha and color indepently (unless you mean straight opacity?)Received on Monday, 25 January 2016 07:23:12 UTC
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