Friday, July 8 2005

Photoshop tips

Apropos of nothing, I thought I’d mention that the two most recently posted pictures here were resized in Photoshop CS, using the new(-ish) Bicubic Sharper resampling method, available in the Image Size dialogue box. I hadn’t seen any mention of it until about two weeks ago, and had been using Mac OS X’s command-line tool sips for quick resizing.

Bicubic Sharper is much better than the standard Photoshop resizing, sips, or iPhoto. It’s particularly good for rendered images with fine detail. I’ve been working on a Roborally tile set for Dundjinni, creating my basic floor texture with Alien Skin Eye Candy 5: Textures. Dundjinni expects 200x200 tiles, but Eye Candy renders best at larger sizes. Resizing down from 800x800 using the straight Bicubic method produced an unusable image. Bicubic Sharper? Dramatically better.

I found the tip in a discussion of photo-processing workflow, which makes sense. For a long time, photographers have been making Unsharp Mask the final step in their workflows, because if they sharpened at full size, the slight softness introduced by resizing for print or web use would force them to use Unsharp Mask again, which tends to look pretty nasty. Integrating it into the resizing algorithm takes advantage of the data you’re discarding, reducing the chance of introducing distracting artifacts.