So, I'm resizing some images and there's awful bug appears - some kind of grid. It only appears on some images and only when I'm using Lanczos and other filters. Only Best interpolation and nearest neighbor works properly. What is it?
Here's example - original.jpg and scaled.jpg.
Bug with resizing with Lanczos and some other filters
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Bug with resizing with Lanczos and some other filters
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- scaled.jpg (271.18 KiB) Viewed 10404 times
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- original.jpg (311.25 KiB) Viewed 10404 times
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Re: Bug with resizing with Lanczos and some other filters
That is the way the lanczos and some other filters work.
Best interpolation is normally always the best for scaling the images.
Best interpolation is normally always the best for scaling the images.
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Re: Bug with resizing with Lanczos and some other filters
Well, not really. I tried a bunch of other apps like XnView and GIMP - all of them produced normal clean images.
GC worked correctly too, as far as I remember - problems started with 10.5 or 10.4.
Sometimes grid appears on almost white backgrounds. It's absolutely incorrect.
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Re: Bug with resizing with Lanczos and some other filters
The "grid bug" does not appear in this image viewed on my 27" iMac Retina 5K display.
Regards, Jim
Regards, Jim
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Re: Bug with resizing with Lanczos and some other filters
But I did not touch that routines since version 8.
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Re: Bug with resizing with Lanczos and some other filters
Do you mean that you don't see grid on scaled.jpg? Or that you tried to scale and nothing happens?jamesk8752 wrote: ↑Sun Oct 22, 2017 6:07 pm The "grid bug" does not appear in this image viewed on my 27" iMac Retina 5K display.
Regards, Jim
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Re: Bug with resizing with Lanczos and some other filters
Michael, I don't see the grid on either version (original and rescaled) of the image. And I've never seen a grid an any image I've resized. I use Thorsten's "best interpolation" setting.
Regards, Jim
Regards, Jim
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Re: Bug with resizing with Lanczos and some other filters
Please e-mail the original image zipped for testing to lemke@lemkesoft.de
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Re: Bug with resizing with Lanczos and some other filters
Also, please download the latest BETA build 2901.
I added a lot of internal optimizations:
http://www.lemkesoft.org/beta.html
Thorsten
I added a lot of internal optimizations:
http://www.lemkesoft.org/beta.html
Thorsten