Pillow/PIL/ImageCms.py

#
# The Python Imaging Library.
# $Id$
#
# optional color managment support, based on Kevin Cazabon's PyCMS
# library.
#
# History:
# 2009-03-08 fl   Added to PIL.
#
# Copyright (C) 2002-2003 Kevin Cazabon
# Copyright (c) 2009 by Fredrik Lundh
#
# See the README file for information on usage and redistribution.  See
# below for the original description.
#

from __future__ import print_function

DESCRIPTION = """
pyCMS

    a Python / PIL interface to the littleCMS ICC Color Management System
    Copyright (C) 2002-2003 Kevin Cazabon
    kevin@cazabon.com
    http://www.cazabon.com

    pyCMS home page:  http://www.cazabon.com/pyCMS
    littleCMS home page:  http://www.littlecms.com
    (littleCMS is Copyright (C) 1998-2001 Marti Maria)

    Originally released under LGPL.  Graciously donated to PIL in
    March 2009, for distribution under the standard PIL license

    The pyCMS.py module provides a "clean" interface between Python/PIL and
    pyCMSdll, taking care of some of the more complex handling of the direct
    pyCMSdll functions, as well as error-checking and making sure that all
    relevant data is kept together.

    While it is possible to call pyCMSdll functions directly, it's not highly
    recommended.

    Version History:

        0.1.0 pil mod   March 10, 2009

                        Renamed display profile to proof profile. The proof
                        profile is the profile of the device that is being
                        simulated, not the profile of the device which is
                        actually used to display/print the final simulation
                        (that'd be the output profile) - also see LCMSAPI.txt
                        input colorspace -> using 'renderingIntent' -> proof
                        colorspace -> using 'proofRenderingIntent' -> output
                        colorspace

                        Added LCMS FLAGS support.
                        Added FLAGS["SOFTPROOFING"] as default flag for
                        buildProofTransform (otherwise the proof profile/intent
                        would be ignored).

        0.1.0 pil       March 2009 - added to PIL, as PIL.ImageCms

        0.0.2 alpha     Jan 6, 2002

                        Added try/except statements arount type() checks of
                        potential CObjects... Python won't let you use type()
                        on them, and raises a TypeError (stupid, if you ask me!)

                        Added buildProofTransformFromOpenProfiles() function.
                        Additional fixes in DLL, see DLL code for details.

        0.0.1 alpha     first public release, Dec. 26, 2002

    Known to-do list with current version (of Python interface, not pyCMSdll):

        none

"""

VERSION = "0.1.0 pil"

# --------------------------------------------------------------------.

from PIL import Image
from PIL import _imagingcms

core = _imagingcms

#
# intent/direction values

INTENT_PERCEPTUAL = 0
INTENT_RELATIVE_COLORIMETRIC = 1
INTENT_SATURATION = 2
INTENT_ABSOLUTE_COLORIMETRIC = 3

DIRECTION_INPUT = 0
DIRECTION_OUTPUT = 1
DIRECTION_PROOF = 2

#
# flags

FLAGS = {
    "MATRIXINPUT": 1,
    "MATRIXOUTPUT": 2,
    "MATRIXONLY": (1|2),
    "NOWHITEONWHITEFIXUP": 4, # Don't hot fix scum dot
    "NOPRELINEARIZATION": 16, # Don't create prelinearization tables on precalculated transforms (internal use)
    "GUESSDEVICECLASS": 32, # Guess device class (for transform2devicelink)
    "NOTCACHE": 64, # Inhibit 1-pixel cache
    "NOTPRECALC": 256,
    "NULLTRANSFORM": 512, # Don't transform anyway
    "HIGHRESPRECALC": 1024, # Use more memory to give better accurancy
    "LOWRESPRECALC": 2048, # Use less memory to minimize resouces
    "WHITEBLACKCOMPENSATION": 8192,
    "BLACKPOINTCOMPENSATION": 8192,
    "GAMUTCHECK": 4096, # Out of Gamut alarm
    "SOFTPROOFING": 16384, # Do softproofing
    "PRESERVEBLACK": 32768, # Black preservation
    "NODEFAULTRESOURCEDEF": 16777216, # CRD special
    "GRIDPOINTS": lambda n: ((n) & 0xFF) << 16 # Gridpoints
}

_MAX_FLAG = 0
for flag in FLAGS.values():
    if isinstance(flag, int):
        _MAX_FLAG = _MAX_FLAG | flag

# --------------------------------------------------------------------.
# Experimental PIL-level API
# --------------------------------------------------------------------.

##
# Profile.

class ImageCmsProfile:

    def __init__(self, profile):
        # accepts a string (filename), a file-like object, or a low-level
        # profile object
        if Image.isStringType(profile):
            self._set(core.profile_open(profile), profile)
        elif hasattr(profile, "read"):
            self._set(core.profile_frombytes(profile.read()))
        else:
            self._set(profile) # assume it's already a profile

    def _set(self, profile, filename=None):
        self.profile = profile
        self.filename = filename
        if profile:
            self.product_name = profile.product_name
            self.product_info = profile.product_info
        else:
            self.product_name = None
            self.product_info = None

##
# Transform.  This can be used with the procedural API, or with the
# standard {@link Image.point} method.

class ImageCmsTransform(Image.ImagePointHandler):

    def __init__(self, input, output, input_mode, output_mode,
                 intent=INTENT_PERCEPTUAL,
                 proof=None, proof_intent=INTENT_ABSOLUTE_COLORIMETRIC, flags=0):
        if proof is None:
            self.transform = core.buildTransform(
                input.profile, output.profile,
                input_mode, output_mode,
                intent,
                flags
                )
        else:
            self.transform = core.buildProofTransform(
                input.profile, output.profile, proof.profile,
                input_mode, output_mode,
                intent, proof_intent,
                flags
                )
        # Note: inputMode and outputMode are for pyCMS compatibility only
        self.input_mode = self.inputMode = input_mode
        self.output_mode = self.outputMode = output_mode

    def point(self, im):
        return self.apply(im)

    def apply(self, im, imOut=None):
        im.load()
        if imOut is None:
            imOut = Image.new(self.output_mode, im.size, None)
        result = self.transform.apply(im.im.id, imOut.im.id)
        return imOut

    def apply_in_place(self, im):
        im.load()
        if im.mode != self.output_mode:
            raise ValueError("mode mismatch") # wrong output mode
        result = self.transform.apply(im.im.id, im.im.id)
        return im

##
# (experimental) Fetches the profile for the current display device.
# @return None if the profile is not known.

def get_display_profile(handle=None):
    import sys
    if sys.platform == "win32":
        from PIL import ImageWin
        if isinstance(handle, ImageWin.HDC):
            profile = core.get_display_profile_win32(handle, 1)
        else:
            profile = core.get_display_profile_win32(handle or 0)
    else:
        try:
            get = _imagingcms.get_display_profile
        except AttributeError:
            return None
        else:
            profile = get()
    return ImageCmsProfile(profile)

# --------------------------------------------------------------------.
# pyCMS compatible layer
# --------------------------------------------------------------------.

##
# (pyCMS) Exception class.  This is used for all errors in the pyCMS API.

class PyCMSError(Exception):
    pass

##
# (pyCMS) Applies an ICC transformation to a given image, mapping from
# inputProfile to outputProfile.
#
# If the input or output profiles specified are not valid filenames, a
# PyCMSError will be raised.  If inPlace == TRUE and outputMode != im.mode,
# a PyCMSError will be raised.  If an error occurs during application of
# the profiles, a PyCMSError will be raised.  If outputMode is not a mode
# supported by the outputProfile (or by pyCMS), a PyCMSError will be
# raised.
#
# This function applies an ICC transformation to im from inputProfile's
# color space to outputProfile's color space using the specified rendering
# intent to decide how to handle out-of-gamut colors.
#
# OutputMode can be used to specify that a color mode conversion is to
# be done using these profiles, but the specified profiles must be able
# to handle that mode.  I.e., if converting im from RGB to CMYK using
# profiles, the input profile must handle RGB data, and the output
# profile must handle CMYK data.
#
# @param im An open PIL image object (i.e. Image.new(...) or Image.open(...), etc.)
# @param inputProfile String, as a valid filename path to the ICC input profile
#     you wish to use for this image, or a profile object
# @param outputProfile String, as a valid filename path to the ICC output
#     profile you wish to use for this image, or a profile object
# @param renderingIntent Integer (0-3) specifying the rendering intent you wish
#     to use for the transform
#
#         INTENT_PERCEPTUAL            = 0 (DEFAULT) (ImageCms.INTENT_PERCEPTUAL)
#         INTENT_RELATIVE_COLORIMETRIC = 1 (ImageCms.INTENT_RELATIVE_COLORIMETRIC)
#         INTENT_SATURATION            = 2 (ImageCms.INTENT_SATURATION)
#         INTENT_ABSOLUTE_COLORIMETRIC = 3 (ImageCms.INTENT_ABSOLUTE_COLORIMETRIC)
#
#     see the pyCMS documentation for details on rendering intents and what they do.
# @param outputMode A valid PIL mode for the output image (i.e. "RGB", "CMYK",
#     etc.).  Note: if rendering the image "inPlace", outputMode MUST be the
#     same mode as the input, or omitted completely.  If omitted, the outputMode
#     will be the same as the mode of the input image (im.mode)
# @param inPlace Boolean (1 = True, None or 0 = False).  If True, the original
#     image is modified in-place, and None is returned.  If False (default), a
#     new Image object is returned with the transform applied.
# @param flags Integer (0-...) specifying additional flags
# @return Either None or a new PIL image object, depending on value of inPlace
# @exception PyCMSError

def profileToProfile(im, inputProfile, outputProfile, renderingIntent=INTENT_PERCEPTUAL, outputMode=None, inPlace=0, flags=0):
    if outputMode is None:
        outputMode = im.mode

    if not isinstance(renderingIntent, int) or not (0 <= renderingIntent <=3):
        raise PyCMSError("renderingIntent must be an integer between 0 and 3")

    if not isinstance(flags, int) or not (0 <= flags <= _MAX_FLAG):
        raise PyCMSError("flags must be an integer between 0 and %s" + _MAX_FLAG)

    try:
        if not isinstance(inputProfile, ImageCmsProfile):
            inputProfile = ImageCmsProfile(inputProfile)
        if not isinstance(outputProfile, ImageCmsProfile):
            outputProfile = ImageCmsProfile(outputProfile)
        transform = ImageCmsTransform(
            inputProfile, outputProfile, im.mode, outputMode, renderingIntent, flags=flags
            )
        if inPlace:
            transform.apply_in_place(im)
            imOut = None
        else:
            imOut = transform.apply(im)
    except (IOError, TypeError, ValueError) as v:
        raise PyCMSError(v)

    return imOut

##
# (pyCMS) Opens an ICC profile file.
#
# The PyCMSProfile object can be passed back into pyCMS for use in creating
# transforms and such (as in ImageCms.buildTransformFromOpenProfiles()).
#
# If profileFilename is not a vaild filename for an ICC profile, a PyCMSError
# will be raised.
#
# @param profileFilename String, as a valid filename path to the ICC profile you
#     wish to open, or a file-like object.
# @return A CmsProfile class object.
# @exception PyCMSError

def getOpenProfile(profileFilename):
    try:
        return ImageCmsProfile(profileFilename)
    except (IOError, TypeError, ValueError) as v:
        raise PyCMSError(v)

##
# (pyCMS) Builds an ICC transform mapping from the inputProfile to the
# outputProfile.  Use applyTransform to apply the transform to a given
# image.
#
# If the input or output profiles specified are not valid filenames, a
# PyCMSError will be raised.  If an error occurs during creation of the
# transform, a PyCMSError will be raised.
#
# If inMode or outMode are not a mode supported by the outputProfile (or
# by pyCMS), a PyCMSError will be raised.
#
# This function builds and returns an ICC transform from the inputProfile
# to the outputProfile using the renderingIntent to determine what to do
# with out-of-gamut colors.  It will ONLY work for converting images that
# are in inMode to images that are in outMode color format (PIL mode,
# i.e. "RGB", "RGBA", "CMYK", etc.).
#
# Building the transform is a fair part of the overhead in
# ImageCms.profileToProfile(), so if you're planning on converting multiple
# images using the same input/output settings, this can save you time.
# Once you have a transform object, it can be used with
# ImageCms.applyProfile() to convert images without the need to re-compute
# the lookup table for the transform.
#
# The reason pyCMS returns a class object rather than a handle directly
# to the transform is that it needs to keep track of the PIL input/output
# modes that the transform is meant for.  These attributes are stored in
# the "inMode" and "outMode" attributes of the object (which can be
# manually overridden if you really want to, but I don't know of any
# time that would be of use, or would even work).
#
# @param inputProfile String, as a valid filename path to the ICC input profile
#     you wish to use for this transform, or a profile object
# @param outputProfile String, as a valid filename path to the ICC output
#     profile you wish to use for this transform, or a profile object
# @param inMode String, as a valid PIL mode that the appropriate profile also
#     supports (i.e. "RGB", "RGBA", "CMYK", etc.)
# @param outMode String, as a valid PIL mode that the appropriate profile also
#     supports (i.e. "RGB", "RGBA", "CMYK", etc.)
# @param renderingIntent Integer (0-3) specifying the rendering intent you
#     wish to use for the transform
#
#         INTENT_PERCEPTUAL            = 0 (DEFAULT) (ImageCms.INTENT_PERCEPTUAL)
#         INTENT_RELATIVE_COLORIMETRIC = 1 (ImageCms.INTENT_RELATIVE_COLORIMETRIC)
#         INTENT_SATURATION            = 2 (ImageCms.INTENT_SATURATION)
#         INTENT_ABSOLUTE_COLORIMETRIC = 3 (ImageCms.INTENT_ABSOLUTE_COLORIMETRIC)
#
#     see the pyCMS documentation for details on rendering intents and what they do.
# @param flags Integer (0-...) specifying additional flags
# @return A CmsTransform class object.
# @exception PyCMSError

def buildTransform(inputProfile, outputProfile, inMode, outMode, renderingIntent=INTENT_PERCEPTUAL, flags=0):
    if not isinstance(renderingIntent, int) or not (0 <= renderingIntent <=3):
        raise PyCMSError("renderingIntent must be an integer between 0 and 3")

    if not isinstance(flags, int) or not (0 <= flags <= _MAX_FLAG):
        raise PyCMSError("flags must be an integer between 0 and %s" + _MAX_FLAG)

    try:
        if not isinstance(inputProfile, ImageCmsProfile):
            inputProfile = ImageCmsProfile(inputProfile)
        if not isinstance(outputProfile, ImageCmsProfile):
            outputProfile = ImageCmsProfile(outputProfile)
        return ImageCmsTransform(inputProfile, outputProfile, inMode, outMode, renderingIntent, flags=flags)
    except (IOError, TypeError, ValueError) as v:
        raise PyCMSError(v)

##
# (pyCMS) Builds an ICC transform mapping from the inputProfile to the
# outputProfile, but tries to simulate the result that would be
# obtained on the proofProfile device.
#
# If the input, output, or proof profiles specified are not valid
# filenames, a PyCMSError will be raised.
#
# If an error occurs during creation of the transform, a PyCMSError will
# be raised.
#
# If inMode or outMode are not a mode supported by the outputProfile
# (or by pyCMS), a PyCMSError will be raised.
#
# This function builds and returns an ICC transform from the inputProfile
# to the outputProfile, but tries to simulate the result that would be
# obtained on the proofProfile device using renderingIntent and
# proofRenderingIntent to determine what to do with out-of-gamut
# colors.  This is known as "soft-proofing".  It will ONLY work for
# converting images that are in inMode to images that are in outMode
# color format (PIL mode, i.e. "RGB", "RGBA", "CMYK", etc.).
#
# Usage of the resulting transform object is exactly the same as with
# ImageCms.buildTransform().
#
# Proof profiling is generally used when using an output device to get a
# good idea of what the final printed/displayed image would look like on
# the proofProfile device when it's quicker and easier to use the
# output device for judging color.  Generally, this means that the
# output device is a monitor, or a dye-sub printer (etc.), and the simulated
# device is something more expensive, complicated, or time consuming
# (making it difficult to make a real print for color judgement purposes).
#
# Soft-proofing basically functions by adjusting the colors on the
# output device to match the colors of the device being simulated. However,
# when the simulated device has a much wider gamut than the output
# device, you may obtain marginal results.
#
# @param inputProfile String, as a valid filename path to the ICC input profile
#     you wish to use for this transform, or a profile object
# @param outputProfile String, as a valid filename path to the ICC output
#     (monitor, usually) profile you wish to use for this transform, or a
#     profile object
# @param proofProfile String, as a valid filename path to the ICC proof profile
#     you wish to use for this transform, or a profile object
# @param inMode String, as a valid PIL mode that the appropriate profile also
#     supports (i.e. "RGB", "RGBA", "CMYK", etc.)
# @param outMode String, as a valid PIL mode that the appropriate profile also
#     supports (i.e. "RGB", "RGBA", "CMYK", etc.)
# @param renderingIntent Integer (0-3) specifying the rendering intent you
#     wish to use for the input->proof (simulated) transform
#
#         INTENT_PERCEPTUAL            = 0 (DEFAULT) (ImageCms.INTENT_PERCEPTUAL)
#         INTENT_RELATIVE_COLORIMETRIC = 1 (ImageCms.INTENT_RELATIVE_COLORIMETRIC)
#         INTENT_SATURATION            = 2 (ImageCms.INTENT_SATURATION)
#         INTENT_ABSOLUTE_COLORIMETRIC = 3 (ImageCms.INTENT_ABSOLUTE_COLORIMETRIC)
#
#     see the pyCMS documentation for details on rendering intents and what they do.
# @param proofRenderingIntent Integer (0-3) specifying the rendering intent you
#     wish to use for proof->output transform
#
#         INTENT_PERCEPTUAL            = 0 (DEFAULT) (ImageCms.INTENT_PERCEPTUAL)
#         INTENT_RELATIVE_COLORIMETRIC = 1 (ImageCms.INTENT_RELATIVE_COLORIMETRIC)
#         INTENT_SATURATION            = 2 (ImageCms.INTENT_SATURATION)
#         INTENT_ABSOLUTE_COLORIMETRIC = 3 (ImageCms.INTENT_ABSOLUTE_COLORIMETRIC)
#
#     see the pyCMS documentation for details on rendering intents and what they do.
# @param flags Integer (0-...) specifying additional flags
# @return A CmsTransform class object.
# @exception PyCMSError

def buildProofTransform(inputProfile, outputProfile, proofProfile, inMode, outMode, renderingIntent=INTENT_PERCEPTUAL, proofRenderingIntent=INTENT_ABSOLUTE_COLORIMETRIC, flags=FLAGS["SOFTPROOFING"]):
    if not isinstance(renderingIntent, int) or not (0 <= renderingIntent <=3):
        raise PyCMSError("renderingIntent must be an integer between 0 and 3")

    if not isinstance(flags, int) or not (0 <= flags <= _MAX_FLAG):
        raise PyCMSError("flags must be an integer between 0 and %s" + _MAX_FLAG)

    try:
        if not isinstance(inputProfile, ImageCmsProfile):
            inputProfile = ImageCmsProfile(inputProfile)
        if not isinstance(outputProfile, ImageCmsProfile):
            outputProfile = ImageCmsProfile(outputProfile)
        if not isinstance(proofProfile, ImageCmsProfile):
            proofProfile = ImageCmsProfile(proofProfile)
        return ImageCmsTransform(inputProfile, outputProfile, inMode, outMode, renderingIntent, proofProfile, proofRenderingIntent, flags)
    except (IOError, TypeError, ValueError) as v:
        raise PyCMSError(v)

buildTransformFromOpenProfiles = buildTransform
buildProofTransformFromOpenProfiles = buildProofTransform

##
# (pyCMS) Applies a transform to a given image.
#
# If im.mode != transform.inMode, a PyCMSError is raised.
#
# If inPlace == TRUE and transform.inMode != transform.outMode, a
# PyCMSError is raised.
#
# If im.mode, transfer.inMode, or transfer.outMode is not supported by
# pyCMSdll or the profiles you used for the transform, a PyCMSError is
# raised.
#
# If an error occurs while the transform is being applied, a PyCMSError
# is raised.
#
# This function applies a pre-calculated transform (from
# ImageCms.buildTransform() or ImageCms.buildTransformFromOpenProfiles()) to an
# image.  The transform can be used for multiple images, saving
# considerable calcuation time if doing the same conversion multiple times.
#
# If you want to modify im in-place instead of receiving a new image as
# the return value, set inPlace to TRUE.  This can only be done if
# transform.inMode and transform.outMode are the same, because we can't
# change the mode in-place (the buffer sizes for some modes are
# different).  The  default behavior is to return a new Image object of
# the same dimensions in mode transform.outMode.
#
# @param im A PIL Image object, and im.mode must be the same as the inMode
#     supported by the transform.
# @param transform A valid CmsTransform class object
# @param inPlace Bool (1 == True, 0 or None == False).  If True, im is modified
#     in place and None is returned, if False, a new Image object with the
#     transform applied is returned (and im is not changed).  The default is False.
# @return Either None, or a new PIL Image object, depending on the value of inPlace
# @exception PyCMSError

def applyTransform(im, transform, inPlace=0):
    try:
        if inPlace:
            transform.apply_in_place(im)
            imOut = None
        else:
            imOut = transform.apply(im)
    except (TypeError, ValueError) as v:
        raise PyCMSError(v)

    return imOut

##
# (pyCMS) Creates a profile.
#
# If colorSpace not in ["LAB", "XYZ", "sRGB"], a PyCMSError is raised
#
# If using LAB and colorTemp != a positive integer, a PyCMSError is raised.
#
# If an error occurs while creating the profile, a PyCMSError is raised.
#
# Use this function to create common profiles on-the-fly instead of
# having to supply a profile on disk and knowing the path to it.  It
# returns a normal CmsProfile object that can be passed to
# ImageCms.buildTransformFromOpenProfiles() to create a transform to apply
# to images.
#
# @param colorSpace String, the color space of the profile you wish to create.
#     Currently only "LAB", "XYZ", and "sRGB" are supported.
# @param colorTemp Positive integer for the white point for the profile, in
#     degrees Kelvin (i.e. 5000, 6500, 9600, etc.).  The default is for D50
#     illuminant if omitted (5000k).  colorTemp is ONLY applied to LAB profiles,
#     and is ignored for XYZ and sRGB.
# @return A CmsProfile class object
# @exception PyCMSError

def createProfile(colorSpace, colorTemp=-1):
    if colorSpace not in ["LAB", "XYZ", "sRGB"]:
        raise PyCMSError("Color space not supported for on-the-fly profile creation (%s)" % colorSpace)

    if colorSpace == "LAB":
        if isinstance(colorTemp, float):
            colorTemp = int(colorTemp + 0.5)
        if not isinstance(colorTemp, int):
            raise PyCMSError("Color temperature must be a positive integer, \"%s\" not valid" % colorTemp)

    try:
        return core.createProfile(colorSpace, colorTemp)
    except (TypeError, ValueError) as v:
        raise PyCMSError(v)

##
# (pyCMS) Gets the internal product name for the given profile.
#
#  If profile isn't a valid CmsProfile object or filename to a profile,
# a PyCMSError is raised If an error occurs while trying to obtain the
# name tag, a PyCMSError is raised.
#
# Use this function to obtain the INTERNAL name of the profile (stored
# in an ICC tag in the profile itself), usually the one used when the
# profile was originally created.  Sometimes this tag also contains
# additional information supplied by the creator.
#
# @param profile EITHER a valid CmsProfile object, OR a string of the filename
#     of an ICC profile.
# @return A string containing the internal name of the profile as stored in an
#     ICC tag.
# @exception PyCMSError

def getProfileName(profile):
    try:
        # add an extra newline to preserve pyCMS compatibility
        if not isinstance(profile, ImageCmsProfile):
            profile = ImageCmsProfile(profile)
        return profile.profile.product_name + "\n"
    except (AttributeError, IOError, TypeError, ValueError) as v:
        raise PyCMSError(v)

##
# (pyCMS) Gets the internal product information for the given profile.
#
# If profile isn't a valid CmsProfile object or filename to a profile,
# a PyCMSError is raised.
#
# If an error occurs while trying to obtain the info tag, a PyCMSError
# is raised
#
# Use this function to obtain the information stored in the profile's
# info tag.  This often contains details about the profile, and how it
# was created, as supplied by the creator.
#
# @param profile EITHER a valid CmsProfile object, OR a string of the filename
#     of an ICC profile.
# @return A string containing the internal profile information stored in an ICC
#     tag.
# @exception PyCMSError

def getProfileInfo(profile):
    try:
        if not isinstance(profile, ImageCmsProfile):
            profile = ImageCmsProfile(profile)
        # add an extra newline to preserve pyCMS compatibility
        return profile.product_info + "\n"
    except (AttributeError, IOError, TypeError, ValueError) as v:
        raise PyCMSError(v)

##
# (pyCMS) Gets the default intent name for the given profile.
#
# If profile isn't a valid CmsProfile object or filename to a profile,
# a PyCMSError is raised.
#
# If an error occurs while trying to obtain the default intent, a
# PyCMSError is raised.
#
# Use this function to determine the default (and usually best optomized)
# rendering intent for this profile.  Most profiles support multiple
# rendering intents, but are intended mostly for one type of conversion.
# If you wish to use a different intent than returned, use
# ImageCms.isIntentSupported() to verify it will work first.
#
# @param profile EITHER a valid CmsProfile object, OR a string of the filename
#     of an ICC profile.
# @return Integer 0-3 specifying the default rendering intent for this profile.
#
#         INTENT_PERCEPTUAL            = 0 (DEFAULT) (ImageCms.INTENT_PERCEPTUAL)
#         INTENT_RELATIVE_COLORIMETRIC = 1 (ImageCms.INTENT_RELATIVE_COLORIMETRIC)
#         INTENT_SATURATION            = 2 (ImageCms.INTENT_SATURATION)
#         INTENT_ABSOLUTE_COLORIMETRIC = 3 (ImageCms.INTENT_ABSOLUTE_COLORIMETRIC)
#
#     see the pyCMS documentation for details on rendering intents and what they do.
# @exception PyCMSError

def getDefaultIntent(profile):
    try:
        if not isinstance(profile, ImageCmsProfile):
            profile = ImageCmsProfile(profile)
        return profile.profile.rendering_intent
    except (AttributeError, IOError, TypeError, ValueError) as v:
        raise PyCMSError(v)

##
# (pyCMS) Checks if a given intent is supported.
#
# Use this function to verify that you can use your desired
# renderingIntent with profile, and that profile can be used for the
# input/output/proof profile as you desire.
#
# Some profiles are created specifically for one "direction", can cannot
#  be used for others.  Some profiles can only be used for certain
# rendering intents... so it's best to either verify this before trying
# to create a transform with them (using this function), or catch the
# potential PyCMSError that will occur if they don't support the modes
# you select.
#
# @param profile EITHER a valid CmsProfile object, OR a string of the filename
#     of an ICC profile.
# @param intent Integer (0-3) specifying the rendering intent you wish to use
#     with this profile
#
#         INTENT_PERCEPTUAL            = 0 (DEFAULT) (ImageCms.INTENT_PERCEPTUAL)
#         INTENT_RELATIVE_COLORIMETRIC = 1 (ImageCms.INTENT_RELATIVE_COLORIMETRIC)
#         INTENT_SATURATION            = 2 (ImageCms.INTENT_SATURATION)
#         INTENT_ABSOLUTE_COLORIMETRIC = 3 (ImageCms.INTENT_ABSOLUTE_COLORIMETRIC)
#
#     see the pyCMS documentation for details on rendering intents and what they do.
# @param direction Integer specifing if the profile is to be used for input,
#     output, or proof
#
#         INPUT  = 0 (or use ImageCms.DIRECTION_INPUT)
#         OUTPUT = 1 (or use ImageCms.DIRECTION_OUTPUT)
#         PROOF  = 2 (or use ImageCms.DIRECTION_PROOF)
#
# @return 1 if the intent/direction are supported, -1 if they are not.
# @exception PyCMSError

def isIntentSupported(profile, intent, direction):
    try:
        if not isinstance(profile, ImageCmsProfile):
            profile = ImageCmsProfile(profile)
        # FIXME: I get different results for the same data w. different
        # compilers.  Bug in LittleCMS or in the binding?
        if profile.profile.is_intent_supported(intent, direction):
            return 1
        else:
            return -1
    except (AttributeError, IOError, TypeError, ValueError) as v:
        raise PyCMSError(v)

##
# (pyCMS) Fetches versions.

def versions():
    import sys
    return (
        VERSION, core.littlecms_version, sys.version.split()[0], Image.VERSION
        )

# --------------------------------------------------------------------

if __name__ == "__main__":
    # create a cheap manual from the __doc__ strings for the functions above

    from PIL import ImageCms
    print(__doc__)

    for f in dir(pyCMS):
        print("="*80)
        print("%s" %f)

        try:
            exec ("doc = ImageCms.%s.__doc__" %(f))
            if "pyCMS" in doc:
                # so we don't get the __doc__ string for imported modules
                print(doc)
        except AttributeError:
            pass