12/2/2023 0 Comments Xnconvert compression levelDifferences in nconvert&xnview jpeg compression.What exactly does "subsampling factor" do?.XnView uses same JPEG encoder as GIMP ?.Options->Read/Write->JPG: Use estimated Quality.JPEG Lossless does not support non-rgb colorspaces.Standard Values for JPG-Compression and EXIF/IPTC settings.JPEG compression as lossless as possible.foxyshadis is our resident expert b/c she understands the math behind itįorum references regarding the JFIF/JPEG file format: Images that are 1-bit black and white, however, are generally much better saved as TIFFs using 'Fax' CCITT G4 compression, resulting in lossless images with much smaller filesizes.Ĭday wrote: ↑ Thu 6:28 pmXnTriq is, of course, the expert on all these matters. In my experience images with large pixel dimensions, such as scans made at high resolution, can be compressed using quite low quality values with little or no visible loss of quality.Īnd the JPEG format is in principle unsuited to images containing sharp edges such as lines and text characters, nonetheless for colour and grayscale images it is often the best option overall when filesize is an issue. Ideally you would probably save using a 'use estimated quality' option, but I don't see that option in a quick look at the NConvert 7.39 Help file, and I am not sure if it has been requested, if not it would be a useful addition. If file size is an issue you could if necessary save at 100, and then make the final save at a lower value. I suggest that you save at the default quality of 85, or higher if you wish using the -q option, and possibly compare the output of successively saved versions to see if you can actually see any difference in quality. I think in most situations saving a JPEG multiple times is much less of an issue than many people think. Because (at the moment) there is no multiline-feature, I have to repeat "write line - save jpg - write line - save. The idea behind it is that I use "nconvert.exe" to add text in multiple lines.
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