If you work with images for any reason, you should check this out! I came across this video on Youtube by accident with a Google search about re-sizing algorithms e.g Nearest Neighbor (preserve hard eges), Bilinear, Bicubic (best for smooth gradients) Bicubic Smoother (best for enlargement) Bicubic Sharper (best for reduction).
Two Israeli computer science students Shai Avidan and Ariel Shamir developed a content aware image resizing algorithm also known as seam carving and demoed the technology with software they developed. Apparently this technology has been included in Adobe Photoshop CS4. I am not sure how complete the feature is however. Will have to come back and do an update after I explore this technology more. I did a Google search for FOSS alternatives and found Seam Carving GUI Which makes me a happy camper especially since there is a pre-compiled binary for Macs available for download. Pretty nifty stuff. I have been a stickler for proper aspect ratios and have had to make some tough cropping decisions. It's nice to have this new possibility to be able to re-size an image with acceptable distortion that can respect the important content of the image.
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