DMND: A gamma-correct, energy-preserving, subpixel image resizer

dmnd.io

21 points·atemerev··8 comments

In the example picture of the guy in white shirt with the blackboard, bicubic looks best.

DMND with subpixels off has weird aliasing on the blackboard drawins, and with subpixels on it's the same, plus zooming in makes the subpixel "trickery" visible as color artifacts.

That is, of course, subjective. There are ppl out there who like it clean and sharp - but without "ringing", and there are ppl who prefer smooth lines and hate aliasing.

But most imaging software only offers the second option, that's why I have made the other one :)

Of course. :)

With antialiasing the pure dmnd version does indeed look better to me, which is funny, as in games i hate anti-aliasing and love my little discrete pixels.

Now there's a second weird issue: I can't actually see any differences between 1 and 2. Maybe my vision is not good enough, or my Samsung 245B+ has too much DPI for where i'm sitting at, but i honestly can't tell a difference in that image. With the Z-machine image the difference is extremely visual though. Maybe that would be a better front page example?

Take a closer look at the enlarged fragment: https://tvori.info/jit/subpixel-resize/halos4x.png

What I am trying to avoid are the black rings around white-on-gray lines, which sharpening causes to images.

Oh, and your display _might_ try sharpening everything by itself, so you can't see any difference at 1:1 size :)

Added the 'antialias' option for you - check it out. There is a ton of knobs under the hood :)

Update: Changed color for transparent images from bright magenta to white %)

How does it work?

Well, just applying textbook signal processing algorithms properly, without optimizations commonly done to speed things up.

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