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Man page of pfsinppm
pfsinppm
Section: User Commands (1)
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NAME
pfsinppm - Load images or frames in PBM formats
SYNOPSIS
pfsinppm
(<file> [--linear] [--absolute <max_lum>] [--frames <range>] [--skip-missing]) [<file>...]
DESCRIPTION
pfsinppm
command loads images in PBM formats (PPM, PNM or PGM) and writes
pfs stream to the standard output. The pfs stream is
usually piped to another program for further processing. To detect the
format automatically based on the extension, use pfsin
command. For more information on PBM formats, refer to the NetPBM web page
(http://netpbm.sourceforge.net/).
Note that PPM or PNM images are low dynamic range. Therefore pixel
values (0-255) are scaled to 0-1 before
storing them in pfs stream. Similarly, before writing low dynamic
range image from pfs stream, pixel values are multiplied by 255. By
default, the 'LUMINANCE' tag is set to 'DISPLAY'. The '--linear' switch can force the
inverse sRGB transformation and provide linear data. In this case the 'LUMINANCE'
tag is set to 'RELATIVE'. '--absolute' switch can
be used to convert pixels to absolute luminance values.
To read images from standard input use a single dash '-' instead of
filename. The images are read until EOF is reached.
Each file can contain a %d pattern, which is substituted with frame
numbers. The pattern has the same syntax as C
printf
command. For example, you can use %04d to make the frame number
four digit with proceedings zeros. See the OPTIONS section below for details.
OPTIONS
- --frames <range>
-
Range is given in mathlab / octave format:
startframe:step:endframe
Frame numbers start with
startframe
(default 0), are increased by
step
(default 1) and stop at
endframe
You can skip one of those values, for example
1:100
for frames 1,2,...,100 and
0:2:
for frame 0,2,4,... up to the last file that exists.
- --skip-missing
-
Skip up to ten frames in a row if corresponding files are
missing. Otherwise the program stops reading sequence at the first
file that does not exists. This switch does not apply to the first
frame in a sequence. This switch can be useful if there is a rendered
animation where some of the frame has not been generated.
- --linear, -l
-
Converts pixel values to linear luminance (XYZ), assuming the sRGB
color space for the input image. The maximum pixel value (255,255,255)
is mapped to Y=1. LUMINANCE tag is set to RELATIVE.
- --absolute <max_lum>, -a <max_lum>
-
--absolute converts pixel values to an absolute linear luminance
(XYZ), that is the color space, in which channel Y contains luminance
given in cd/m^2. The sRGB color space is assumed for the input
image. The maximum pixel value (255,255,255) is mapped to
Y=<max_lum>. <max_lum> is typically set to 80 [cd/m^2] for
a CRT monitor. LUMINANCE tag is set to
ABSOLUTE. --absolute process images almost the same as
--relative, but additionally it scales all pixels by
<max_lum>.
EXAMPLES
- pfsinppm frame%04d.ppm --frames 0:10 | pfsview
-
Read frames from files frame0000.ppm, frame0001.ppm, ...,
frame0010.ppm and show them using pfsview.
BUGS
Please report bugs and comments to Grzegorz Krawczyk
<krawczyk@mpi-sb.mpg.de> and Rafal Mantiuk
<mantiuk@mpi-sb.mpg.de>.
SEE ALSO
pfsin(1),
pfsout(1)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- EXAMPLES
-
- BUGS
-
- SEE ALSO
-
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Time: 12:35:04 GMT, April 24, 2007