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Resizing bitmaps could be better


hal07
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Hi, we use Paint.Net to some extent, and I try install Paint.Net to all my users. I like it a lot.

Just one thing, could you see if you can work on the smoothing/resizing on bitmaps?

E.g. if I take a screenshot of a normal Windows program, and then I try resize it, then it often becomes far too smoothed. I've tried experimenting with the different resamplings but I cannot find a resampling that compares to the quality of "an expensive competitor product" ;)

So, I wonder if it's possible to look into this? Maybe add a separate resampling that works best for bitmaps like screenshots of windows and menus?

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Sure. Attached is the examples.

I'm not sure if this is the best example, but it indicates the problem. All paint.net resizes are from 419 to 390 horizontal (keeping aspect ratio), using various filters.

I think there's no question that the pshop image is by far sharper than the paint.net resizes. There might be other examples I could give you if this ain't enough. Notice that all resizes from paint.net gives shadows/smoothing on some of the letters in fonts, whilst photoshop resize seem to detect this and gives a sharper result.

examples.zip

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Photoshop doesn't "detect" anything, it merely incorporates the sharpen filter as part of its resizing.

So in Paint.NET, just run Effects -> Photo -> Sharpen after dong a resize.

The Paint.NET Blog: https://blog.getpaint.net/

Donations are always appreciated! https://www.getpaint.net/donate.html

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Speaking as a Photoshop user, it has one of the dumbest resize functions I've ever witnessed. It's hard to find and way too feature heavy in the standard dialog box.

That said, Rick is right. It just sharpens after it resizes. If you don't like Paint.NET's default sharpen effect, there are several others available for download as plugins. Just go to searchpaint.net and look for the Unsharp Mask and Sharpen+.

 

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Umm, ok? There's only so much I can do man, I offered up my explanation for why Photoshop has "sharper" results, and how you might get similar results in Paint.NET. I'm not sure what more you can really expect on such short notice.

Photoshop has 3 different bicubic implementations. It also requires you to be psychic and choose which one is the best. Ed Harvey knows the difference between them better than I do, and was asking about trying them out in Paint.NET. But the code wasn't working right and I haven't had a chance to look at it again.

The Paint.NET Blog: https://blog.getpaint.net/

Donations are always appreciated! https://www.getpaint.net/donate.html

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