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 -xscale XN -yscale YN path/to/image.pam > path/to/output.pam