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Trim

Image trimming
Removes any single-color padding around the image if present.
The parameter does not specify the amount of border or frame to trim but rather how aggressive the trim algorithm should be. A bigger value of the parameter (e.g. 25) will trim rather more than not enough. Typical values are between 0 and 10.
This allows you to use the same parameter values for all your images.
trim=X
If the image is resized with the width and/or height commands, the resizing is performed after the border (if present) is trimmed.

Examples

Preview
Syntax
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Original image: /docs/painting_big.jpg?w=400​
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Original image: /docs/sofa.jpg?w=400​
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Trimmed image: /docs/sofa.jpg?w=400&trim=10​