NAME
pfsoutimgmagick - Write images or frames using Image Magick library
SYNOPSIS
pfsoutimgmagick [--linear] [--quality <val>] [--bit-depth] [--frames
<range>]) <file> [<file>...]
DESCRIPTION
This command can write images or frames in the multitude of image
formats supported by the ImageMagick library. This includes but is not
limited to: BMP, JPG, PNG, GIF, EPS, TIFF, DPX. See the manual page of
ImageMagick for the full list of available formats.
pfsoutimgmagick reads images or frames in pfs format from the Standard
Input and writes them under the specified file name(s).
The input of pfsinimgmagick must be within 0-1 range. If LUMINANCE tag
set is set to RELATIVE or ABSOLUTE, the linear values will be gamma
corrected, assuming sRGB color space. Use --linear switch to disable
gamma correction.
The images are stored using the bit-depth for which the ImageMagick
library was compiled (default is 16 bit). Note that some formats (for
example JPEG) do not support encoding more than 8 bits per color
channel. To use higher bit-depths, store images in the PNG format.
This command stores ’ALPHA’ channel if it is present in the pfs stream.
Each file name 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. You can select the frames using the following
options (the options must be always given after the file name):
--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.
--srgb, -s
Apply the sRGB non-linearity (approximately 2.2 gamma) before
writing a file. This can be used instead of using pfsgamma -g
2.2 to store the result of some tone-mapping operators. The
option will compress contrast to make sure that tone values are
properly shown on a display. It should be only used with
linearized (not gamma corrected) images that are normalized to
the 0-1 range.
--quality <val>, -q <val>
Set JPEG/PNG compression level from 1 to 100. Default 75.
--bit-depth <val>, -b <val>
Enforce bit-depth (per color channel). The allowed values are
from 8 to 32. If not specified, the bit depth from the pfs
stream (’BITDEPTH’ tag) will be used instead. If the ’BITDEPTH’
tag is missing, the ImageMagick default value will be used
(usually 16). The bit depth of actually stored file may be lower
of that specified, if the file format does not support higher
bit depths.
EXAMPLES
pfsin test.jpg | pfsout test.png
Convert from one image format to another.
pfsin --linear test.jpg | pfsout --srgb test.png
The same as above, but apply inverse gamma correction after
reading an image (--linear) and then apply gamma correction
before writing an image (--srgb).
BUGS
pfsoutimgmagick can not write frames to the standard output.
Please report bugs and comments on implementation to the discussion
group http://groups.google.com/group/pfstools
SEE ALSO
pfsout(1) ImageMagick(1)
pfsoutimgmagick(1)