[krita] [Bug 413125] Color to alpha makes the image loses its original color
https://bugs.kde.org/show_bug.cgi?id=413125 --- Comment #7 from acc4commissi...@gmail.com --- https://imgur.com/yabotQ4 Hope this help to reproduce the process. -- You are receiving this mail because: You are watching all bug changes.
[krita] [Bug 413125] Color to alpha makes the image loses its original color
https://bugs.kde.org/show_bug.cgi?id=413125 --- Comment #6 from vanyossi --- This a link to the original xcf: https://drive.google.com/open?id=1YjfmfWuiI5AMiR7QuYGsZjKx_Wxr-q4u Im not familiar with the mode you mention in the gimp, but the gimp docs suggests it is a switch to activate legacy blending modes for the dropdown list. If that is the case that would explain why chaning the "mode" does nothing to the ouput of color to Alpha in gimp when I tried out. -- You are receiving this mail because: You are watching all bug changes.
[krita] [Bug 413125] Color to alpha makes the image loses its original color
https://bugs.kde.org/show_bug.cgi?id=413125 --- Comment #5 from acc4commissi...@gmail.com --- (In reply to vanyossi from comment #4) > Created attachment 123448 [details] > Alpha to color effect > > Logic tells me you are right, it should only affect the alpha channel, but > In reality as we make a color more transprent it looses saturation to the > white below. I don't know how is implemented in gimp 2.10 but it gives me > the same results. > > Attached image is from gimp Color to alpha. the first two panels I applied > Color to alpha, then converted the alpha from the channel directly into a > transparency mask: The first one has the mask turned off, the second one has > mask on (in the first on e you see black on fully transparent colors) There > is loss in color. The third and last panel: after applying color to alpha I > made a selection from that alpha information and applied it as an > transparency mask to the original image. The third is with the transparency > mask on, and the last one with the transparency mask off (Here we only > affect the alpha but we also see loss of color). > > Doing the exact same in Krita will yield the same results. Color to Alpha -> > Split Alpha -> Alpha into Mask. For the second: Color to Alpha -> Ctrl + > Click on layer thumbnail (or Select -> Select Opaque) -> right click on > layer: Add Transparency Mask. > > However in Krita the preview does seem to shift color. This seems to happen > as the Threshold is less agressive and affects much more softly other colors > which in turn gives the apperance of a shift in color (less saturated). In > Gimp this effect can also be seen but to a lesser extent since the threshold > is much more contrasted, in fact its in Krita it is not possible to adjust > the threshold to affect the colors in the same way as the gimp. Can you provide me the original picture of this? In my gimp it only affects the opacity and gives me 0 loss of color. (Remember : You need to change mode of the target layer from 'Default' to 'Legacy' on the top right of the layer docker!) -- You are receiving this mail because: You are watching all bug changes.
[krita] [Bug 413125] Color to alpha makes the image loses its original color
https://bugs.kde.org/show_bug.cgi?id=413125 --- Comment #4 from vanyossi --- Created attachment 123448 --> https://bugs.kde.org/attachment.cgi?id=123448=edit Alpha to color effect Logic tells me you are right, it should only affect the alpha channel, but In reality as we make a color more transprent it looses saturation to the white below. I don't know how is implemented in gimp 2.10 but it gives me the same results. Attached image is from gimp Color to alpha. the first two panels I applied Color to alpha, then converted the alpha from the channel directly into a transparency mask: The first one has the mask turned off, the second one has mask on (in the first on e you see black on fully transparent colors) There is loss in color. The third and last panel: after applying color to alpha I made a selection from that alpha information and applied it as an transparency mask to the original image. The third is with the transparency mask on, and the last one with the transparency mask off (Here we only affect the alpha but we also see loss of color). Doing the exact same in Krita will yield the same results. Color to Alpha -> Split Alpha -> Alpha into Mask. For the second: Color to Alpha -> Ctrl + Click on layer thumbnail (or Select -> Select Opaque) -> right click on layer: Add Transparency Mask. However in Krita the preview does seem to shift color. This seems to happen as the Threshold is less agressive and affects much more softly other colors which in turn gives the apperance of a shift in color (less saturated). In Gimp this effect can also be seen but to a lesser extent since the threshold is much more contrasted, in fact its in Krita it is not possible to adjust the threshold to affect the colors in the same way as the gimp. -- You are receiving this mail because: You are watching all bug changes.
[krita] [Bug 413125] Color to alpha makes the image loses its original color
https://bugs.kde.org/show_bug.cgi?id=413125 Bug Janitor Service changed: What|Removed |Added Resolution|WAITINGFORINFO |--- Status|NEEDSINFO |REPORTED --- Comment #3 from Bug Janitor Service --- Thanks for your comment! Automatically switching the status of this bug to REPORTED so that the KDE team knows that the bug is ready to get confirmed. In the future you may also do this yourself when providing needed information. -- You are receiving this mail because: You are watching all bug changes.
[krita] [Bug 413125] Color to alpha makes the image loses its original color
https://bugs.kde.org/show_bug.cgi?id=413125 --- Comment #2 from acc4commissi...@gmail.com --- (In reply to vanyossi from comment #1) > did you adjust the trheshold too high?? > > If you only want to remove pure white you have to adjust threshold to > something around 30, any value higher than that will probably make color to > alpha remove other colors near white, like yellows. > > I do loose some color information if threshold is high. > > Tested on 8bit RGB ColorSpace. The point is that 'the color shouldn't change as I move the silder'. Sorry for mentioning other applications but in gimp it only scrapes opacity and not the color. -- You are receiving this mail because: You are watching all bug changes.
[krita] [Bug 413125] Color to alpha makes the image loses its original color
https://bugs.kde.org/show_bug.cgi?id=413125 vanyossi changed: What|Removed |Added Resolution|--- |WAITINGFORINFO Status|REPORTED|NEEDSINFO CC||ghe...@gmail.com --- Comment #1 from vanyossi --- did you adjust the trheshold too high?? If you only want to remove pure white you have to adjust threshold to something around 30, any value higher than that will probably make color to alpha remove other colors near white, like yellows. I do loose some color information if threshold is high. Tested on 8bit RGB ColorSpace. -- You are receiving this mail because: You are watching all bug changes.
