12:20 a.m.
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-...
<
https://inkscape.org/en/~fabien.fellay/%E2%98%85chromatic-aberration-rc-c...
<
https://inkscape.org/en/~fabien.fellay/%E2%98%85chromatic-aberration-with...
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
1:53 a.m.
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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2:13 p.m.
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
------------------------------ ------------------------------ ------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
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1:19 a.m.
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/>;.
Warm regards,
Fabien
2139
days inactive
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inkscape-user@lists.inkscape.org
3 comments
3 participants
participants (3)
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Fabien Fellay -
Ivan Louette -
makiimai #