![]() ![]() is also useful, in that it uses Wand, so putting that operation within the binary-chop loop seems to be a way forward. ImageMagick has been around for almost 25 years and is a full-fledged command-line image editor. A bunch of tools out there do this, including GD and GraphicsMagick, but ImageMagick strikes a good balance between power and availability in hosting environments. Perhaps there is no generalized way to do this without a multi-dimensional search.Īlso, since the input files are PDFs, can this even be done with PIL? The first choice is about rasterization, for which I have been using Wand. This is where automated image resizing comes in handy. WandĮdit: is quite close too - though the exact code there already (inevitably?) makes some choices about how to go about reducing the file size ( resize in that case). Python set maximum file size when converting (pdf) to jpeg using e.g. Scale image according a maximum file size I could also wrap the various (macOS) command-line tools in python.Īdditionally, I only want to do any compression at all where it's absolutely necessary (the source is mainly text), which leaves a choice of compression algorithms. I could use Wand or PIL in a loop (preference for python) until the filesize is below a certain value, but for 1000s of images this will have a large I/O overhead unless there's a way to predict/estimate the filesize without writing it out first. ImageMagick: scale JPEG image with a maximum file-size), but there doesn't seem to be an equivalent for other file formats e.g. In ImageMagick a JPEG output can do this with extent (see e.g. I've looked in many places but can't find an answer to this question. ![]() How would you scale/optimize/minimally output a PNG image so that it just falls below a certain maximum file size? (The input sources are various - PDF, JPEG, GIF, TIFF.)
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