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Old 05-26-2010, 05:42 PM   #1
BobRoosth
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Default Best Downsample Technique

Does anyone have a good tool/technique/action for preserving fine detail (as much as possible) when downsampling an image from 2000+ px wide to under 400 px?

I changed Photoshop's options to use Bicubic Sharper. That helped some. I just tried a series of 10% reductions. The result is overly sharpened, although perhaps better for the intended use on the web.

Just looking for suggestions?

Also, I used use an action call UltraSharpen to prepare images for print, but it no longer works after moving to my new computer. And is no longer available on the web. Anyone have a favorite tool for sharpening images for the press (or the web).
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Old 05-27-2010, 12:20 AM   #2
LoisWakeman
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Qimage from DDI software
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Old 05-27-2010, 07:32 AM   #3
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Lois,

Reviewing the quimage features page, I don't see anything about simply modifying files and saving them. It all seems to be oriented to printing. Did I miss something?
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Old 05-28-2010, 12:46 AM   #4
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It is excellent at printing, but has very good resampling/sharpening algorithms, which you can set for print or web (for web use, you print to file rather than a printer). It's a bit hard to explain what it does in one para, as it is one of a kind!

Not sure if it would be worth buying if you don't print though.
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Old 05-27-2010, 01:34 AM   #5
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If it is for web publishing try The GIMP.

   
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Old 05-27-2010, 07:08 AM   #6
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Why would GIMP do a better job than Photoshop CS3?
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Old 05-27-2010, 07:36 AM   #7
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Haven't used PS since pre CS, but The GIMP just does a great job of downsampling without any fuss.

If you don't think it's worth your while trying it then you could try the following instead: apply a slight gaussian blur (1px or so - too much and the result will be on the soft side), downsampling to 288 PPI, then 144 PPI and lastly to 72 PPI, using Sinc (Lanczos3) interpolation. When you use steps resulting in odd number of pixels things can move in unexpected ways.

Let us know how you get on.

Things = Pixels

   
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Last edited by Bo Aakerstrom; 05-28-2010 at 02:07 AM. Reason: Clarification
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