pnmcomp

Composite PNM images with transparency

TLDR

Composite images

$ pnmcomp [overlay.pnm] [background.pnm] > [output.pnm]

With alpha mask

$ pnmcomp -alpha=[mask.pgm] [overlay.pnm] [background.pnm] > [output.pnm]

Position overlay

$ pnmcomp -xoff=[100] -yoff=[50] [overlay.pnm] [background.pnm] > [output.pnm]

SYNOPSIS

pnmcomp [options] overlay background

pnmcomp composites two PNM images by overlaying one on top of another with optional alpha transparency. An alpha mask (PGM file) controls the blending between overlay and background pixels.
Position offsets (-xoff, -yoff) control where the overlay is placed on the background. Part of the Netpbm toolkit; superseded by pamcomp in newer versions.

PARAMETERS

OVERLAY

Foreground image.

BACKGROUND

Background image.

-alpha FILE

Alpha mask.

-xoff PIXELS

X offset.

-yoff PIXELS

Y offset.

-align POS

Alignment.

CAVEATS

Part of Netpbm. Use pamcomp for newer version.

HISTORY

pnmcomp is part of Netpbm for image compositing.