COMPRESSION ARTIFACT ?

Post questions on how to use or achieve an effect in Inkscape.
klyuchnikovart
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Joined: Wed Apr 01, 2009 6:04 am
Location: Russia

COMPRESSION ARTIFACT ?

Postby klyuchnikovart » Wed Apr 01, 2009 6:21 am

done by inscape 0.46 in linux
Image
so my asking is about my problem about compression artifact (maybe?) i'm not specialist in this stuff, so you can watch it here
Image
in png format after exporting there is a lot of lines on the light effect (so the effect of light seems to be not smooth..)
why it's like this?
thank's for help

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aho
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Re: COMPRESSION ARTIFACT ?

Postby aho » Wed Apr 01, 2009 7:49 am

This effect is called banding. Since PNG is lossless it isn't to blame. The reason for this kind of artifacts is the way Inkscape calculates the gradient's colors - or more precisely: Inkscape only calculates a specific amount of colors (1000 or 2000 or something like that) and it also doesn't bother with dithering.

Currently there are only 2 options: You can either break up the banding with some noise or try a different SVG renderer.

klyuchnikovart
Posts: 14
Joined: Wed Apr 01, 2009 6:04 am
Location: Russia

Re: COMPRESSION ARTIFACT ?

Postby klyuchnikovart » Wed Apr 01, 2009 8:06 am

aho wrote:This effect is called banding. Since PNG is lossless it isn't to blame. The reason for this kind of artifacts is the way Inkscape calculates the gradient's colors - or more precisely: Inkscape only calculates a specific amount of colors (1000 or 2000 or something like that) and it also doesn't bother with dithering.

Currently there are only 2 options: You can either break up the banding with some noise or try a different SVG renderer.


Oh Thnks! I've found the 3rd option is ->smoothing tool in GIMP
so now i belive it looks better =)
Image

I'D SAY MORE LIVELY =)

Image
Last edited by klyuchnikovart on Fri Apr 03, 2009 8:28 am, edited 3 times in total.

SureWhyNot
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Re: COMPRESSION ARTIFACT ?

Postby SureWhyNot » Wed Apr 01, 2009 2:12 pm

Glad you were able to solve your problem. Nice work too!

And aho, do you know if that issue is going to be fixed in version .47?

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aho
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Re: COMPRESSION ARTIFACT ?

Postby aho » Thu Apr 02, 2009 7:50 am

>And aho, do you know if that issue is going to be fixed in version .47?

Unfortunately I don't know if anyone is working on this. But I'm pretty sure it's going to be addressed at some point (at least for PNG export).


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