вс, 30 окт. 2022 г., 17:21 Phyllis Smith <[email protected]>:
> The below is very possible (except for the gimp comparison) meaning we > may be making black where it should be white. But as Andrew implied old > projects may suddenly provide different unexpected results if we change it. > >> I think you see, we are making black areas where gimp was making white >> areas... >> > or may be i get layers order wrong / > Much work was performed to follow one of many versions of the Overlays > from various other software packages. In the Description section of the > Overlays chapter in the manual, it states: > Divide: Divides source color by destination color. If the source color is > white, the > result color is the underlying color. The resulting image is often > lighter. > *Mathformula used is different than that used by Gimp*; there is no SVG > equivalent. > https://cinelerra-gg.org/download/CinelerraGG_Manual/Arithmetic_Group.html > > I believe that CinGG when rewriting the code several years ago attempted > to follow the algorithm that currently existed in Cinelerra HV version at > the time, but the image I had included earlier comparing CinGG with HV > 4.6.1 is so different. One or the other is inconsistent. Changing it to > match Gimp is not desirable, however it would be great to fix an obvious > bug. > I found some python description of Adobe's blend modes .... also, blending and compositing can be two stages of more complex process?? https://github.com/psd-tools/image-blender/blob/master/src/image_blender.pyx see divide/subtract grouped together ... > On Sun, Oct 30, 2022 at 1:59 AM Andrew Randrianasulu via Cin < > [email protected]> wrote: > >> but should we blindly follow gimp ? Again, gimp tend to have bigger mode >> list ) may be right thing to do is leave some of our modes intact (they >> might be buggy but graphics art can utilize that, too) and add >> gimp/svg/oldcin compatible modes ? >> > > >> >> ---------- Forwarded message --------- >> От: Андрей Рандрианасулу <[email protected]> >> Date: сб, 29 окт. 2022 г., 18:43 >> Subject: cingg vs gimp 2.10 compositing mode divide >> To: randrianasulu <[email protected]> >> >> >> >> I think you see, we are making black areas where gimp was making white >> areas... >> -- >> Андрей Рандрианасулу >> -- >> Cin mailing list >> [email protected] >> https://lists.cinelerra-gg.org/mailman/listinfo/cin >> >
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