Imagemagick: Convert to fixed width, proportional height

Imagemagick Problem Overview

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?

Imagemagick Solutions

Solution 1 - Imagemagick

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

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

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Content Type	Original Author	Original Content on Stackoverflow
Question	Christof Aenderl	View Question on Stackoverflow
Solution 1 - Imagemagick	moropus	View Answer on Stackoverflow
Solution 2 - Imagemagick	Christof Aenderl	View Answer on Stackoverflow

Content Type

Original Author

Original Content on Stackoverflow

Question

Christof Aenderl

View Question on Stackoverflow

Solution 1 - Imagemagick

moropus

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Solution 2 - Imagemagick

Christof Aenderl

View Answer on Stackoverflow