Archive 2012 · how to sharpen for the web?

AhamB
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p.5 #1 · how to sharpen for the web?

Mescalamba wrote:
My semi-natural looking attempt.

Not too bad but I still see plenty of aliasing (viewing on 15.4" 1920x1080). I'd either use the history brush or a layer mask to get rid of that.

Jan 27, 2015 at 10:49 AM

LightShow
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p.5 #2 · how to sharpen for the web?

Toothwalker wrote:
In my opinion,

- multi-step downsizing should not be necessary with proper tools
- sharpening before downsampling is a no-go area
- an image free of artifacts is necessarily soft when viewed at the pixel level.

That said, some apparent sharpness at the pixel level is desirable for web viewing, so we have to find a balance between sharpness and artifacts. The method that I have been using for the past half year or so is

- downsample with lanczos3 (single step)
- edge detection with a Laplace kernel
- apply sharpening with preferential undershoot.

With my standard settings:
http://toothwalker.org/temp/fm/resizeMe-2.jpg

The total processing time from the 24 Mpx original...Show more →
Your picture changed ratio(squished), I assume that was an error, thought you may want to know just in case you've been doing that to all your shots.

Edited on Feb 03, 2015 at 07:24 PM · View previous versions

Feb 03, 2015 at 12:26 PM

Toothwalker
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p.5 #3 · how to sharpen for the web?

LightShow wrote:
Your picture changed ratio(squished), I assume that was an error, thought you may want to know just in case you've been doing that to all your shots.

Thanks for being observant. It was a bookkeeping mistake.

Feb 03, 2015 at 02:08 PM

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