Resizing causing pixallation

[AnyaB]

Hi all,

I've read the tutorials and also a previous thread on this topic but still have not found an answer.

I wish to resize a PNG file for use on a website - decreasing the dpi from 521px to 85px in size. It's something I do a lot in photoshop but I'm fairly new to Affinity.

The problem is that the resize is completely pixallated (see attached). It's not the Nearest Neighbour problem as I have checked that I am resizing to the best quality and nothing to do with the view. Can anybody help me please?

Thanks

[MEB]

Hi AnyaB,

Welcome to Affinity Forums

If you are resizing the image on export you have to select an appropriate Resample algorithm from the resample dropdown. Try using Bicubic or Lanczos 3 (separable) and check if you get a better result. Note that since the output size you need/want is quite small (just 85px), even the best resample algorithms may not give a perfect result but should improve what you already have.

 

For cases like this (small images, text, icons etc) it may be preferable to create/draw them at the intended output size, that is, creating a document with just 85px in your case and drawing them with the vector tools setting the View Mode to Pixels in the View menu so you can control/view the exact output you will get when you export the file (without resizing obviously).

[AnyaB]

Hi MEB,

Many thanks for your response. I'd tried all the different algorithms from the dropdowns and none of them make any difference to the quality. It's something that I do regularly in photoshop (including with the same set of icons) but I guess that this is not an option with Affinity unless you can think of anything else I could be doing wrong.

 

 

[lepr]

.

[Oval]

On 6. September 2017 at 10:41 PM, AnyaB said:

tried all the different algorithms from the dropdowns and none of them make any difference

 

AnyaB, the different algorithms result in different qualities:

  Could be better, but this is a different point. [The small rectangle shows the scaling ratio.]

  a PS result for comparison

 

So it is still very unclear what you expect from such small high contrast pictures. But bigger sizes, the use as a font or just lower contrasts would possibly help in that unclear case.