Imagemagick: Convert to fixed width, proportional height
Using the imagemagick convert command, how can I resize an image to a fixed width and proportional height e.g. using the -resize or the -thumbnail option?
Solution 1:
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.
Solution 2:
Imagemagick geometry: 'width'x'height' If you leave one part empty, this means resize proportional.
Examples:
100x200 # width = 100, height = 200
300x # width = 300, height = proportional
x300 # width = proportional, height = 300