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kinwolf

[By Design] Image scaling lose quality(pixelaetd)

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Hi,

 I am trialing Affinity Photo 1.6.5 on windows 10 and I'm having problem scaling imported image.  basically, when I shrink an image it becomes pixelated.  This happen both with "resize document" and while dragging the corner.  The It does it with any algorithm chosen.    I tried to do the same in krita and it scaled perfectly, never losing quality.  Known problem?.

 

Edit: I've attached scaled down image as an example of the pixelated result.

 

 

scaled Down.jpg

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Hi @kinwolf,

Welcome to the forums. 

Do you preview the image at 100% zoom?

I would say this is expected, as you're shrinking the image, and therefore, you will have fewer pixels. 

Thanks,

Gabe. 

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Hi,

   Thanks for the welcome :)

Yes, I was zoomed in at 200%, but mostly to show the pixelation clearly.  It was noticeable to the eye without the zoom. 

If I try the same thing in krita, there is no problem, here is the same image scaled down to a much smaller ratio, and zoomed in at 400%, there is no loss in quality.  That's why I was wondering if it was a bug in affinity photo.

krita.jpg

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Can you attach the actual image, rather than a screenshot? 


-- Walt

Windows 10 Home, version 1903 (18362.356), 16GB memory, Intel Core i7-6700K @ 4.00Gz, GeForce GTX 970
Affinity Photo 1.7.3.481 and 1.8.0.486 Beta   / Affinity Designer 1.7.3.481 and 1.8.0.486 Beta  / Affinity Publisher 1.7.3.481 and 1.7.3.475 Beta

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Hi,

 

Sure.  The original. 

Scaledown -> scaled down in affinity photo and exported using bicubic.

ScaledownL -> scaled down in affinity photo and exported using Lanczos.

krita-> You know what?  when I exported the scaled down version in krita, it actually "changed" the image on screen, and it now looks just as pixelated as in affinity.  So it seems krita is "cheating" on the display until you actually save the file.  That was interesting to watch.

So, I guess it's normal behavior and I got fooled by a small display cheat in krita. 

 

original.png

scaledown.png

scaledownL.png

krita.png

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Other software might do smoothing preview when zooming, which is generally a bad practice for Pixel work. We will close this as "by design". 

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