Use RAISR or SRCNN for image resize for viewing

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Jou
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Use RAISR or SRCNN for image resize for viewing

Post by Jou » Sat Jan 21, 2017 5:38 pm

The current "high quality" rescaler also makes the images a bit blurry when scaling down by just 10%.
Question is: Which algorithm is used anyway? Bicubi? Bilinear? Lanczos?
What about the google RAISR algorithm at https://research.googleblog.com/2016/11 ... chine.html and SRCNN algorithm at http://mmlab.ie.cuhk.edu.hk/projects/SRCNN.html
Any chance you'd include one of them?
A comparison between those two at https://thestack.com/wp-content/uploads ... amples.jpg shows IMHO not much difference between RAISR and SRCNN the are both good.
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m.Th.
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Re: Use RAISR or SRCNN for image resize for viewing

Post by m.Th. » Sun Jan 22, 2017 11:33 am

Jou wrote:The current "high quality" rescaler also makes the images a bit blurry when scaling down by just 10%.
Question is: Which algorithm is used anyway? Bicubi? Bilinear? Lanczos?
What about the google RAISR algorithm at https://research.googleblog.com/2016/11 ... chine.html and SRCNN algorithm at http://mmlab.ie.cuhk.edu.hk/projects/SRCNN.html
Any chance you'd include one of them?
A comparison between those two at https://thestack.com/wp-content/uploads ... amples.jpg shows IMHO not much difference between RAISR and SRCNN the are both good.
...your title says "for viewing"... this changes the things a lot: we do not need the best quality kernel but the best speed 70%/quality 30% proportion ratio.

Perhaps the best thing would be to add (if Pierre wants) these algorithms in the resize kernel list which is surfaced in Browser Tab in Tools | Batch Convert | Resize or in Single Image Tab in Image | Resize and perhaps(?) use the same list in Tools | Settings | View | High zoom quality [sic] - btw. it should read High Quality Zoom.

What setting do you have for "High Zoom Quality" setting mentioned above? Did you tried the other values?
m. Th.

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