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pamstretch — Scale up a PAM image by interpolating between pixels. See also: `pamstretch-gen`, `pamenlarge`, `pam

Submitted by: @import:tldr-pages·Mar 2, 2026·

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scalecommandpambetweencliimagepamstretchinterpolating

Problem

How to use the pamstretch command: Scale up a PAM image by interpolating between pixels. See also: pamstretch-gen, pamenlarge, pamscale. More information: <https://netpbm.sourceforge.net/doc/pamstretch.html>.

Solution

pamstretch — Scale up a PAM image by interpolating between pixels. See also: pamstretch-gen, pamenlarge, pamscale. More information: <https://netpbm.sourceforge.net/doc/pamstretch.html>.

Scale up a PAM image by an integer factor:

pamstretch {{n}} {{path/to/image.pam}} > {{path/to/output.pam}}

Scale up a PAM image by the specified factors in the horizontal and vertical directions:

pamstretch {{[-x|-xscale]}} {{xn}} {{[-y|-yscale]}} {{yn}} {{path/to/image.pam}} > {{path/to/output.pam}}

Code Snippets

Scale up a PAM image by an integer factor

pamstretch {{n}} {{path/to/image.pam}} > {{path/to/output.pam}}

Scale up a PAM image by the specified factors in the horizontal and vertical directions

pamstretch {{[-x|-xscale]}} {{xn}} {{[-y|-yscale]}} {{yn}} {{path/to/image.pam}} > {{path/to/output.pam}}

Context

tldr-pages: common/pamstretch

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