What’s it all mean? Unfortunately, for those of us who just want a simple answer, the results of this testing indicates that one size doesn’t fit all. The Photoshop bicubic sharper algorithm seems to be better than anything for the particular down res-ing operation that I tested. Testing with a variety of resolution ratios might… [Read More]
Archives for June 22, 2011
Resampling for printing, revisited 4
What with stitching and 20+ megapixel backs, sometimes you have to res an image down to print it. I tested all four algorithms on a 480 ppi image resampled down to 360 ppi. Instead of using bicubic smoother in Photoshop, I used bicubic sharper, which Adobe recommends for down-resing. The results: Photoshop Bicubic Sharper (above)… [Read More]
Resampling for printing, revisited 3
The next set of images is res’ed up from 330 ppi to 360 ppi. With some resampling techniques, notably and egregiously nearest neighbor, resampling with resolutions that are close together yields obvious objectionable artifacts. As before, the results are followed by an analysis. Photoshop Bicubic Smoother (above) Perfect Resize (above) Qimage Hybrid (above) Qimage Fusion… [Read More]
Resampling for printing, revisited 2
This next set of images is based on a 240 ppi target scaled to the 360 ppi printer resolution. Because the target is the same 150 pixel on a side target, the images on paper are somewhat smaller. Here are the results, followed by an analysis. Photoshop Bicubic Smoother (above) Perfect Resize (above) Qimage Hybrid… [Read More]