Caesium Image Compressor can do the job and it is easy to use.
Looking for OFFLINE PNG/JPEG compressor software for Win10.However a 2-lobed “Lanczos2” filter (Lanczos with a default lobes of 2, added for easy user selection) has also been found to be popular, as it will avoid the positive Ringing Artefacts that can be generated by Windowed-Sinc filters. The reason for this is because the windowing function itself is “untappered”, in that it is just a single lobe that cuts off, with the functions first zero crossing coinciding with the window support limits.
Though there is little to no real evidence that it is the best, it is a solid middle range filter.īy default IM defines the “Lanczos” filter as having 3 “lobes”. Many people see this as being a good reason to select it over the many other Windowed Sinc Filters. That is, the filter's weighting function is used to set the filter's own windowing function. wrote:The “Lanczos” filter basically uses the first “lobe” of the Sinc() function, to window the Sinc() function. If you are using a bat file because you need do batch convert files, you might also consider the possibility of using XnConvert (or XnView MP Batch convert).Īnd if you wish to try different resampling options, and also possibly other options such as applying a filter to the resized image, you can very easily preview the effect of different actions using the preview displayed in XnConvert. When I downloaded your source file and had a very quick look, the unsaved result seemed similar to your NConvert output. If you wish to experiment with different settings, you could possibly do it more easily using XnView MP GUI software, where you could change settings and see the result immediately. I don't have any immediate idea of what could be causing the quality problem, unless it is possibly simply the use of different JPEG quality values, but you do seem to be using different Lanczcos versions unless they are actually just different names for the same resampling method?
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