pamrgbatopng
Updated: 24 July 2006
Table Of Contents
NAME
pamrgbatopng - convert PAM color/transparency image to PNG
SYNOPSIS
pamrgbatopng [pamfile]
Minimum unique abbreviation of option is acceptable. You may
use double
hyphens instead of single hyphen to denote options. You may
use white space
in place of the equals sign to separate an option name from
its value.
DESCRIPTION
This program is part of Netpbm.
pamrgbatopng reads a PAM image with the RGB_ALPHA tuple type
(a color visual
image with transparency) and produces an equivalent PNG image
as output.
The input image if from the file named by the pamfile argu-
ment, or Standard
Input if you don’t specify pamfile. The output goes to Stan-
dard Output.
The maxval of the input image must be 255. You can use
pamdepth to change
the maxval of an image to 255 if necessary.
pnmtopng is a much more powerful program for generating PNG
images from
Netpbm images, but it cannot take PAM images with transparency
as input. To
supply transparency information, you must supply it in a sepa-
rate PGM image.
That makes it considerably less convenient to use.
(But note that pnmtopng takes PAM images, even with RGB_ALPHA
tuple type
just fine -- it just ignores the alpha plane).
Netpbm’s strategic direction is to add to pnmtopng all the ca-
pabilities of
pamrgbatopng and retire pamrtbatopng. But there’s no telling
when that will
happen.
OPTIONS
None.
SEE ALSO
pam pnmtopng pngtopnm
HISTORY
pamrgbatopng was new in Netpbm 10.30 (October 2005).
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Table Of Contents
* NAME
* SYNOPSIS
* DESCRIPTION
* OPTIONS
* SEE ALSO
* HISTORY
