pamenlarge
enlarges an image by an integer factor using pixel replication
TLDR
Enlarge image 2x
$ pamenlarge 2 [input.pam] > [output.pam]
Enlarge image 4x$ pamenlarge 4 [input.pam] > [output.pam]
Enlarge with different x/y factors$ pamenlarge -xscale [3] -yscale [2] [input.pam] > [output.pam]
SYNOPSIS
pamenlarge [options] factor [pamfile]
DESCRIPTION
pamenlarge enlarges an image by an integer factor using pixel replication. Each pixel becomes a factor×factor block of identical pixels.
This produces a blocky/pixelated look, useful for pixel art or simple scaling. For smooth scaling, use pamscale instead.
PARAMETERS
factor
Scale factor (integer).-xscale n
Horizontal scale factor.-yscale n
Vertical scale factor.
EXAMPLE
$ # Double the size
pamenlarge 2 small.ppm > large.ppm
# Triple horizontal, double vertical
pamenlarge -xscale 3 -yscale 2 input.ppm > output.ppm
pamenlarge 2 small.ppm > large.ppm
# Triple horizontal, double vertical
pamenlarge -xscale 3 -yscale 2 input.ppm > output.ppm
COMPARISON
$ pamenlarge - Fast, integer factors, blocky
pamscale - Smooth scaling, any factor
pamscale - Smooth scaling, any factor
CAVEATS
Integer factors only. No interpolation. Large factors create big files quickly.
HISTORY
pamenlarge is part of Netpbm, providing simple image magnification through pixel replication.
SEE ALSO
pamscale(1), pnmenlarge(1), pamstretch(1)