Was reading this question and got to thinking. How exactly can you determine what the best resampling solution is? I have a concept, albeit somewhat vague, of what the basic methods do.
Are there some good general rules for different types of images? For instance using a particular set of resampling algorithms for photos and a different set for web graphics? Would the overall color of the image, contrast of the subject and the background, etc. come into play?
Answer
There are a series of very informative tutorials on Cambridge in Colour that deal with the subject of image resizing.
- Understanding Image Interpolation covers the basic theory behind image interpolation.
- Image resizing for Web and Email covers downsizing images and the pitfalls to look out for.
- Optimizing Digital Photo Enlargement similarly covers up-scaling images.
The last tutorial is particularly good, as there is a table of common interpolation algorithms together with a diagram that helps you visualize the trade-off each algorithm has with respect to anti-aliasing, blurring and edge halos.
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