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What is the difference between Lanczos seperable and non-seperable.

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Irident Developer is doing the right thing!

 

Lanczos2 (smooth) = separable, 2 lobes

Lanczos3 (sharp) = separable, 3 lobes

Lanczos5 (sharper) = separable, 5 lobes

 

The number of lobes = the sharpness. Common values are 2 (almost zero ringing artifacts) and 4 (best tradeoff between sharpness and ringing).

 

Again, AFP is misimplementing Lanczos by having a pointless, slow non-separable mode and by not providing varying lobe (sharpness) settings.

 

I wish we had Irident developer's menu. It's like an A-Z of all good scaling algorithms!

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Thanks for the lighthouse and single pixel image comparisons.

 

 

Whenever I scan newspapers or magazines: I end up with a moire pattern. However a quick fix, is to use a very low amount of Gaussian Blur. That generally does the trick. 

 

Are there any other tricks like this?..faulty image/name of filter/amount of filter applied.

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Ok I'm just a poor graphic designer, up in years, who has used PS for color correction, resizing and setting up to print ready for a web press.

 

Can anyone compare the Affinity settings to the ones in PS?

 

That's all I need...... Don't care about x and y. Never much cared for algebra anyway

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Can anyone compare the Affinity settings to the ones in PS?

That's all I need...... 

 

That would be all most of us need!  :-)

 

But no, I've not seen a comprehensive comparison on a single chart.  I myself have just been trudging through the Affinity apps trying to compare what is what.  Thankfully, some keyboard shortcuts are the same, but not all.  Although I bought Designer and Photo, neither app is still an Illustrator and Photoshop replacement yet.  I am hopeful that day will come and come soon though.  And toward that end I am searching the apps to see what can be improved.  We should all remember that Photoshop and Illustrator have been around FOR DECADES and are very refined apps.  That makes the Affinity apps all the more surprising because they are really good after only 5 years of engineering.  Perhaps in another year or two, if we all submit well thought out feature requests, we can retire Adobe for good in 2016 or 2017.  Fingers crossed.

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Since no one knows what the difference is between Lanczos 3 "separable" and "non-separable" may I suggest that Serif put something more meaningful and descriptive into those parenthesis instead?

 

In my testing, Lanczos 3 (separable) enlargements and reductions a tad sharper than Bucubic, and Lanczos 3 (non-separable) is much sharper.

 

So I would think the Resample popup should read as follows:

  • Nearest Neighbor
  • Bilinear
  • Bicubic
  • Lanczos 3 (sharp)
  • Lanczos 3 (sharper)

Because, quite honestly, "separable" and "non-separable" may appeal to the left-brainers, but isn't Affinity Photo appealing to our right-brain creative side?  Yes.  So make the descriptions more understandable, please!

Agreed

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