Chromatic Aberration Filters Proposal
Hi all,
I released some filters that allow emulating a very basic chromatic aberration effect. They are available here with some explanations: < https://inkscape.org/da/~fabien.fellay/%E2%98%85chromatic-aberration-filters
They come with some animated examples as well: < https://inkscape.org/en/~fabien.fellay/%E2%98%85chromatic-aberration-rgb-cmy...
< https://inkscape.org/en/~fabien.fellay/%E2%98%85chromatic-aberration-rc-cr-d...
< https://inkscape.org/en/~fabien.fellay/%E2%98%85chromatic-aberration-with-ro...
I later noticed that Inkscape already has similar filters available in the menu Filters > Color > Nudge RGB/CMY... However, the proposed filters here differ slightly regarding the alpha channel management and they do not flood the background with any color. If one just want to apply quickly a basic chromatic aberration effect, I think those filters may come in handy.
In the hope that someone will like them or find them useful.
Best regards, Fabien
Those are great, thank you very much! makiimai
2018-01-28 10:50 GMT+10:30 Fabien Fellay <fabien.fellay@...155...>:
Hi all,
I released some filters that allow emulating a very basic chromatic aberration effect. They are available here with some explanations: https://inkscape.org/da/~fabien.fellay/%E2%98% 85chromatic-aberration-filters
They come with some animated examples as well: https://inkscape.org/en/~fabien.fellay/%E2%98%85chromatic-aberration-rgb- cmy-demo https://inkscape.org/en/~fabien.fellay/%E2%98% 85chromatic-aberration-rc-cr-demo https://inkscape.org/en/~fabien.fellay/%E2%98% 85chromatic-aberration-with-rotating-figures-demo
I later noticed that Inkscape already has similar filters available in the menu Filters > Color > Nudge RGB/CMY... However, the proposed filters here differ slightly regarding the alpha channel management and they do not flood the background with any color. If one just want to apply quickly a basic chromatic aberration effect, I think those filters may come in handy.
In the hope that someone will like them or find them useful.
Best regards, Fabien
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Works fine for me too ! On the other hand you can remove the background of the existing filters afterwards : select the first primitive (Fill) in the Filters Editor and put the Fill opacity to zero. ivan
Le dimanche 28 janvier 2018 à 02:55:13 UTC+1, makiimai # <makiimai092@...155...> a écrit :
Those are great, thank you very much! makiimai 2018-01-28 10:50 GMT+10:30 Fabien Fellay <fabien.fellay@...155...>:
Hi all,
I released some filters that allow emulating a very basic chromatic aberration effect. They are available here with some explanations: <https://inkscape.org/da/~ fabien.fellay/%E2%98% 85chromatic-aberration-filters >
They come with some animated examples as well: <https://inkscape.org/en/~ fabien.fellay/%E2%98% 85chromatic-aberration-rgb- cmy-demo> <https://inkscape.org/en/~ fabien.fellay/%E2%98% 85chromatic-aberration-rc-cr- demo> <https://inkscape.org/en/~ fabien.fellay/%E2%98% 85chromatic-aberration-with- rotating-figures-demo>
I later noticed that Inkscape already has similar filters available in the menu Filters > Color > Nudge RGB/CMY... However, the proposed filters here differ slightly regarding the alpha channel management and they do not flood the background with any color. If one just want to apply quickly a basic chromatic aberration effect, I think those filters may come in handy.
In the hope that someone will like them or find them useful.
Best regards, Fabien
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Thank you very much for your feedback.
As long as the background can be easily removed when using the existing filters, I am now figuring out that my proposed chromatic aberration filters do not bring something fundamentally new (except from the behavior with the alpha channel, which is different).
However, I see 2 issues with the existing filters that can be improved:
1) Aliazing issue with the 'nudge RGB' filter: The 'nudge CMY' and the 'nudge RGB' filters do not have a totally symmetrical behavior. While the 'nudge CMY' filter is perfectly fine, by careful examination, one will notice that the 'nudge RGB' filter suffers from a subtle aliasing effect at the border of the 3 decomposed layers (present in all browsers rendering and Inkscape itself). However, I found a nice (not so easy to figure out) solution to this. Replace the 3 color matrices: red: 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 green: 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 blue: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 by the following new ones (in short: add the 1 -1 at the end of the last lines): red: 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 1 -1 green: 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 -1 blue: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 -1 and you will see that the weird aliasing effect just vanishes. Moreover, that way, the 'nudge RGB' filter recovers a totally symmetrical behavior compared to the 'nudge CMY' filter and everything is fine.
2) Offset issue with the 'nudge RGB' and 'nudge CMY' filters: The 2 first offsets are (logically) applied to the source graphic while the third offset is (surprisingly) applied to the blended results of the first 2 layers. This is rather counter-intuitive. It seems more logical that the third offset also applies to the source graphic (my filters just do that).
And, voilà: if those 2 issues are corrected, one will not really need my filters anymore. As long as the existing filters are actually built-in filters, I'm going to open a bug report (with solution) to < https://bugs.launchpad.net/inkscape/%3E.
Warm regards, Fabien
participants (3)
-
Fabien Fellay -
Ivan Louette -
makiimai #