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Picture This! wrote:
Makten, I've had the opposite experience with Lanczos in that it works very well for downsizing. I've stopped doing multi step resize/sharpens. Instead I downsize with Lanczos and then apply sharpening before I convert to jpg for web. I've had much better success with retaining fine detail using Lanczos than with step downsizing like you indicate above. When you say Lanczos is terrible for many images, can you please elaborate ?
I did a little test last year to find an ultimate resizing technique, which included Lanczos and several types of multistep things, and I found out that I liked the standard bicubic solution much better. I also found out that it was the last downsizing step that was crucial for final sharpness, so I omitted the several steps and began using only two steps. And now I'm pretty happy with the results and my method works for almost any image of any original resolution.
I'll dig into the archive and see if I can find the images that were used when coming to this conclusion. What I do remember, is that Lanczos doesn't preserve local contrast very well. The images keep a lot of detail, but they look very flat and often artificial or "digital". Crisp but with artefacts.
Edit: Your example show exactly what I mean. No local contrast. It just looks dull, but with some crispness at the pixel level.
Edited on Jan 30, 2014 at 08:58 PM · View previous versions