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Scaling down.

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Scaling down. Pere Pujal i Carabantes 09 Oct 22:58
Pere Pujal i Carabantes
2007-10-09 22:58:12 UTC (over 17 years ago)

Scaling down.

Hi all!

I usually have to scale down some images, so I ask about the best practice to do so.

The images (RGB photografies) are in the range of 1000x1000 - 3000x3000px and have to be scaled to a range about 200x200 - 400x400px.

I've read something about go scaling 50% in steps approaching the desired final size and after that scale to the final size. Is this needed in gimp 2.4rc* or the internals of scale does yet this?

I've read too about oversharp the image before scaling down: http://www.robertmekis.com/articles/sharpening/mekis0ta001a1a.html There is a script that claims to do this, http://registry.gimp.org/plugin?id=6929 but I guess that the calls it does to (gimp-selection-sharpen img) does not meet the SHARPEN or SHARPEN MORE from photoshop, so what are the gimp equivalents for SHARPEN or SHARPEN MORE?

I've had problems in the past (gimp 2.3.13) with lanczos alghorithm, after that I've changed the default interpolation to cubic. It is time to give another chance to lanczos?

Any other hints for scaling down are apreciated. Thanks
Pere