119 lines
3.2 KiB
Groff
119 lines
3.2 KiB
Groff
.TH IM_ICC_*() 3 "April 2002"
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.SH NAME
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im_icc_present, im_icc_transform, im_icc_import, im_icc_import_embedded,
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im_icc_export,
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im_icc_export_depth \- transform images using ICC profiles
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.SH SYNOPSIS
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#include <vips/vips.h>
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.br
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#include <vips/colour.h>
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#define VIPS_INTENT_PERCEPTUAL (0)
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.br
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#define VIPS_INTENT_RELATIVE_COLORIMETRIC (1)
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.br
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#define VIPS_INTENT_SATURATION (2)
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.br
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#define VIPS_INTENT_ABSOLUTE_COLORIMETRIC (3)
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int
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.br
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im_icc_present( void )
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.br
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int
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.br
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im_icc_transform( IMAGE *in, IMAGE *out,
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.br
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const char *input_profile_filename,
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.br
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const char *output_profile_filename,
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.br
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int intent )
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int
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.br
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im_icc_import( IMAGE *in, IMAGE *out,
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.br
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const char *input_profile_filename, int intent )
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int
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.br
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im_icc_import_embedded( IMAGE *in, IMAGE *out,
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.br
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int intent )
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int
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.br
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im_icc_export_depth( IMAGE *in, IMAGE *out, int depth,
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.br
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const char *output_profile_filename, int intent )
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int
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.br
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im_icc_export( IMAGE *in, IMAGE *out,
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.br
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const char *output_profile_filename, int intent )
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int
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.br
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im_icc_ac2rc( IMAGE *in, IMAGE *out,
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.br
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const char *profile_filename )
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.SH DESCRIPTION
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.B im_icc_present(3)
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returns non-zero if there is an ICC library available. Calls to the other
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VIPS ICC functions will all fail with an error message if there is no library.
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.B im_icc_transform(3)
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maps between two images using an input and output profile and an intent. The
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input image must have a format matching the input profile (eg. 4 bands for a
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CMYK profile). The output image will have a form matching the output profile
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(eg. 3 bands for an RGB output profile). The input image must be 8 or 16 bit
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unsigned integer. The output image is always 8 bit unsigned int. The output
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profile is attached to the output image under the name
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.B "icc-profile-data".
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Functions like
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.B im_vips2jpeg(3)
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will then attach the profile to the files they create.
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.B im_icc_import(3)
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takes an image to D50 Lab float (profile interconnect space) from device space.
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The input image must match the format expected by the profile: for example, a
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printer profile will usually need 4 band CMYK data. The input image must be 8
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or 16 bit unsigned integer.
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.B im_icc_import_embedded(3)
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takes an image to D50 Lab float (profile interconnect space) from device
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space, using the profile embedded in the image. If there is no embedded
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profile, an error is returned. Test for the presence of a profile with
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.B im_header_get_type(3).
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.B im_icc_export_depth(3)
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takes an image from D50 Lab float back to device space. The output image will
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match the format of the profile: for example, a screen profile will write 3
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band RGB data. The output image biut depth can be set to 8 or 16 with the
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depth parameter. The profile is attached to the output image under
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the name
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.B "icc-profile-data".
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Functions like
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.B im_vips2jpeg(3)
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will then attach the profile to the files they create.
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.B im_icc_export(3)
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behaves just as
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.B im_icc_export_depth(),
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but with depth always 8 bit.
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.B im_icc_ac2rc(3)
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converts an image from D50 absolute to media relative colorimetry using the
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media white point found in the ICC profile.
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.SH RETURN VALUE
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The functions return 0 on success and -1 on error.
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.SH SEE ALSO
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im_LabQ2Lab(3), im_Lab2XYZ(3).
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.SH COPYRIGHT
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The National Gallery
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