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)