Before you begin this guide, you should have a regular, non-root user with sudo privileges configured on. Libvips is a standard part of most linuxes, it's in homebrew and macports, and there are 64-bit windows binaries on the vips website. Command-line Basics: Resizing Images with ImageMagick Prerequisites. So on this test, libvips is 7x faster and uses 15x less memory than graphicsmagick. GraphicsMagick is a little faster, I see: $ /usr/bin/time -l gm convert test.tif -resize 128x128 small.png With convert I see: $ /usr/bin/time -l convert test.tif -resize 128x128 small.pngĪgain, fastest of three runs, 4.87s real time, 1.4gb memory. For example here is a magnified view of one of the built-in tile patterns. Which is great for showing a clean unblurred magnification of an image. When enlarging an image, the pixels in the image are replicated to form a large rectangular blocks of color. That's 0.54s real time, 77MB of peak memory. The '-scale' resize operator is a simplified, faster form of the resize command. The ImageMagick library is very popular, but doesn’t usually come installed by default. sudo apt-get install nautilus-image-converter. Command-line Basics: Resizing Images with ImageMagick Prerequisites. If you wanna try GUI: Install nautilus-image-converter. First install imagemagick, it includes you the convert command, that will process the images. I ran three times and picked the fastest, so that should just be a test of vipsthumbnail and not my disk system. If you want CLI only: sudo apt-get install imagemagick mogrify -resize 320x240 Image.png mogrify -resize 50 Image.png mogrify -resize 320x240. With vipsthumbnail, the image shrinker that comes with vips, I see: $ /usr/bin/time -l vipsthumbnail test.tif -s 128x128 -o small.png So that's a 13000 x 10000 3-band, 8 bit uncompressed TIFF. I timed it on this machine (imac with ImageMagick 6.9.6-3 Q16, gm 1.3.25, vips 8.4.2): $ vips black test.tif 13000 10000 -bands 3 It's got a fancy threaded IO system too, so performance is good and memory use is low. 3) I then need to repeat step 2 but this time resize to 125 x 125. 2) I need copy & past the images to a new folder, where they will be resized to 250 x 250. It's a streaming image processing library, so it's able to read the input, process, and write the output as a single pipeline, with no separate loading phase and no temporary files. Below I have listed the basic steps/needs of the script: 1) The images are located in a folder & are all (or should be) 500 x 500.
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