Paint.Net doesn't handle scaling properly (gamma error)

[Ilko]

Since I do fansub, I work with avisynth+ and came to something very interesting. Most of softwares in the world don't handle scaling properly (even very expensive softs), including PDN. It seems to be an error of gamma interpretation.

 

If you try to resize this image :

 

You'll get this result, or worse :

 

Also, try scaling this one to 1:2 :

 

 

Here is the source, a full detailed article on how it works and possible solutions :

http://www.ericbrasseur.org/gamma.html

 

[Rick Brewster]

Yeah, this is verrrrrrrrry old news. Fixing this requires an enormous amount of work -- likely inspecting and recoding every single piece of rendering code within the app. Highly unlikely it'll happen. (Just trying to set reasonable expectations ...)

[Ilko]

lol I wasn't aware of this issue before recently ! But I'm wondering, it's possible to write a resize plugin that will do it correctly, right ?

[toe_head2001]

55 minutes ago, Ilko said:

But I'm wondering, it's possible to write a resize plugin that will do it correctly, right ?

 

No, plugins aren't able to change the canvas size.

[Ego Eram Reputo]

A plugin could resize down, leaving a blank/colored margin. You'd have to manually crop that.

 

Resizing up will run into the problem that the larger image will be cropped at the current canvas edge unless you expand the canvas before running the plugin ?

[Ilko]

Hmm I see. Thank you.