Legacy ImageMagick Discussions Archive

"-interlace JPEG" reduces the file size for me? Source images are JPEGs (saved at 100% quality) I don't have anything better, they have been provided by other companies. magick in.jpg -strip -resize x500 -quality 70 -sampling-factor 4:2:0 out.jpg = 65.6kb magick in.jpg -strip -interlace JPEG -resize ...

It could, but the website explicitly lets you choose what quality level you want so I honestly doubt it is. The image artefacts look almost identical as a 75 quality imagemagick image too, if I turn down the imagemagick quality (i.e. 70) there's more artefacts than the one produced by the website ...

Not sure what tool they use I was just using a website (resizeimage.net). I think I was mistaken about them using ImageMagick though, I ran magick identify -verbose on their output image and assumed because the output said "Version: ImageMagick 7.0.8-10 Q16 x64 2018-08-14" that was the tool their ...

I'm not entirely sure, I'll try out some different tools, magick identify -verbose says their quality is 75, same as mine. Using -sampling-factor 4:2:0 gets me a little bit closer to their file size (70.5kb vs 59.2kb) but it's still quite a significant difference (I'm resizing 750,000 images).

Thanks for the reply, that website is using Imagemagick to process/compress the images too (same version as me) so it seems more to do with what options they're using rather than a libjpeg limitation?

Hi, I need to resize a lot of images so I'm wanting to use the imagemagick command line, previously I've just used a website to do it for me (resizeimage.net). Problem is, the resulting image from imagemagick is significantly larger than if I use the site mentioned above: magick in.jpg -strip ...

Thanks for your replies dlemstra. @adhoc - ResourceLimits.Memory is in bytes, I just set mine to 100GB (100_000_000_000) which was the lowest I could use to process all my images (although the process itself never went above 150MB usage). Obviously this isn't recommended to do with anything ...

Hi, thanks for your reply. If I use this image (https://upload.wikimedia.org/wikipedia/commons/4/41/Sunflower_from_Silesia2.jpg) and loop over resizing it: static void Main(string[] args) { var sw = new Stopwatch(); for (int i = 1; i <= 500; i++) { sw.Restart(); using (MagickImage image = new ...

Hi, I'm using Magick.NET-Q16-AnyCPU (7.4.3) with .NET Core 2.0, need to batch process ~25,000 images, (make square, resize to large/thumb), just using a single thread at the moment: using (MagickImage image = new MagickImage(inputFile)) { image.ColorFuzz = new Percentage(1); image.Trim(); var ...