A Draft of the ImageMagick Field Guide

Summary

ImageMagick Field Guide Table of Contents Resize an Image for the Web Reduce Animated GIF File Size Combine Multiple Images into an Animated GIF Stack Images Vertically ImageMagick with a URL Conventions Used in This Guide Resize an Image for the Web magick input.png \ -resize 800x> \ -strip \ -quality 75 \ -interlace Plane \ output.jpg -resize 800x> Set the width to 800px and maintain aspect ratio without upscaling smaller images. Use 800x to also upscale smaller images. -strip Remove EXIF, IPTC, XMP, and embedded color profiles to reduce file size. -quality 75 Set JPEG compression to 75. -interlace Plane Interlace the image so that it progressively sharpens as more data arrives. Reduce Animated GIF File Size magick input.gif \ -fuzz 7% \ -layers optimize \ output.gif fuzz 7% Allow a 7% color difference when comparing pixels for optimization. This helps further reduce size by treating near-identical colors as the same. -layers optimize Optimize the GIF animation by reducing redundant pixels between frames, which can reduce file size. Combine Multiple Images into an Animated GIF magick input1.png input2.png input3.png \ -delay 100 \ -loop 5 \ -dispose previous \ output.gif -delay 100 Pause for 1 second between frames. -loop 5 Loop the frames five times. Use -loop 0 to loop forever. -dispose previous Clears the previous frame before drawing the next. Stack Images Vertically magick input1.jpg input2.jpg input3.jpg \ -append \ result.jpg -append Stack images vertically. Use +append to stack horizontally instead. ImageMagick With a URL magick https://example.com/input.png \ result.jpg Requires ImageMagick compiled with HTTPS delegate support. Some ImageMagick builds disable remote reading. Conventions Used in This Guide Use input.png and output.jpg as the filenames (extensions can change as needed). Put one switch on each line. Use future tense such as "optimize" instead of "optimizes" or "optimized". Use AP style heading capitalization. Use the newer magick command ins...