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Dave Martindale wrote:
It sounds like ACDSee uses nearest-neighbour resampling for quickly resizing too-large images. I still use ACDSee Classic, and it certainly does just that. While this might have been a good choice when the typical computer had a 100 or 200 MHz CPU clock, it produces a number of nasty artifacts, and is a poor choice today. With today's CPUs, it makes sense to use a resampling algorithm that filters the image properly while resizing it. Irfanview gives you the choice of either method, and that's why my default image-opening application is Irfanview, not ACDSee. Although it takes a little longer for Irfanview to calculate a properly-resized image, the result is often much better looking and worth the wait - even on my ancient PIII-700. On the other hand, when browsing through a directory full of images, I still use ACDSee because its one-image read-ahead helps a lot, and when I'm looking at lots of images the quality of each one isn't so important. Another interesting case is Photoshop. Years ago, Photoshop used only nearest-neighbour resampling for screen display, but it tried to display at sizes that used integer downsampling ratios (25%, 33%, 50%) to minimize effects like discontinuities in diagonals. Then at some version Adobe introduced the "image cache", which is really a image pyramid, several copies of the same image resampled to several smaller sizes. Photoshop uses this for displaying reduced-size versions of the image when it can, giving cleaner-looking results that are more representative of how the image would look if you really reduced the image to that size. Dave I would invite you to send your thoughts and ideas to and/or visit the forums at http://forums.acdsystems.com and put a post up. I will forward your posting to the appropriate people in ACD Systems. Thanks for your comments, -- James Addison http://www.pjsoft.ca |
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