12/4/2023 0 Comments Xnconvert best jpeg settings![]() Then if you like, zoom in and lock the zoom in each image for a really close comparison. There would be a very obvious loss of perceived image quality?Ĭompare the two images, is the lower image obviously quite unusable as predicted? For easier comparison, save each image, and then open the two images in adjacent tabs in XnView MP. So, if an image were to be opened and then resaved repeatedly, what would you expect the final 'quality' to be if a file with initial Q = 80 is resaved ten times:Ġ.80 * 0.80 * 0.80 * 0.80 * 0.80 * 0.80 * 0.80 * 0.80 * 0.80 * 0.80 * 0.80 = 0.107 ? However, whether xnview software could be modified to eliminate one source of possible perceived image quality loss when a file is resaved is, I accept, a side issue that complicates the immediate discussion relating back to the issue raised in Peter2's original post. My point was that xnview software can detect the subsampling (or whatever) settings that were used when the file was last saved - that information can be determined when the file is opened, and is displayed in the file information display - therefore saving using Use original quality (when possible) could in principle take account of that information, and so avoid the source of the loss mentioned in you example above. You illustrated that point using an example where the image might, when saved when using Use original quality (when possible), be saved with different subsampling (or whatever) settings, as that parameter wasn't considered. You were making the point that resaving inevitably entails loss of perceived image quality. Cday wrote: ↑ Fri 10:24 pmThe XnView file 'info' displays 'Subsampling', so in principle that could be read and an image resaved using Use estimated original quality (when possible) with the same subsampling, even if you say that is not implemented now?Ĭould you please rephrase or elaborate on your question, cday?
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