resize -resize 400×300+20+30 (like the -scale and -sample examples below) converts an input to an output image which has the pixel dimensions of 400×300. It also shifts the output by 20 pixels to the right and by 30 pixels to the bottom. Additionally, there are a few more differences to -scale: -resize does support an … Read more
Use -resize 100x to resize images to 100 pixels in width while maintaining the height’s aspect ratio. Read the fine ImageMagick manual for details.
ImageMagick ships with the montage utility. Montage will append each image side-by-side allowing you to adjust spacing between each image (-geometry), and the general layout (-tile). montage [0-4].png -tile 5×1 -geometry +0+0 out.png Other examples can be found on Montage Usage page
Note: the solution in this and other answers involves disabling safety measures that are there to fix arbitrary code execution vulnerabilities. See for instance this ghostscript-related and this ubuntu-related announcement. Only go forward with these solutions if the input to convert comes from a trusted source. I use ImageMagick in php (v.7.1) to slice PDF … Read more