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363 lines
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ReStructuredText
363 lines
12 KiB
ReStructuredText
.. py:module:: PIL.ImageCms
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.. py:currentmodule:: PIL.ImageCms
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:py:mod:`~PIL.ImageCms` Module
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==============================
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The :py:mod:`~PIL.ImageCms` module provides color profile management
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support using the LittleCMS2 color management engine, based on Kevin
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Cazabon's PyCMS library.
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.. autoclass:: ImageCmsTransform
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.. autoexception:: PyCMSError
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Functions
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---------
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.. autofunction:: applyTransform
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.. autofunction:: buildProofTransform
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.. autofunction:: buildProofTransformFromOpenProfiles
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.. autofunction:: buildTransform
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.. autofunction:: buildTransformFromOpenProfiles
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.. autofunction:: createProfile
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.. autofunction:: getDefaultIntent
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.. autofunction:: getOpenProfile
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.. autofunction:: getProfileCopyright
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.. autofunction:: getProfileDescription
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.. autofunction:: getProfileInfo
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.. autofunction:: getProfileManufacturer
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.. autofunction:: getProfileModel
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.. autofunction:: getProfileName
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.. autofunction:: get_display_profile
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.. autofunction:: isIntentSupported
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.. autofunction:: profileToProfile
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.. autofunction:: versions
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CmsProfile
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----------
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The ICC color profiles are wrapped in an instance of the class
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:py:class:`CmsProfile`. The specification ICC.1:2010 contains more
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information about the meaning of the values in ICC profiles.
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For convenience, all XYZ-values are also given as xyY-values (so they
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can be easily displayed in a chromaticity diagram, for example).
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.. py:class:: CmsProfile
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.. py:attribute:: creation_date
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:type: Optional[datetime.datetime]
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Date and time this profile was first created (see 7.2.1 of ICC.1:2010).
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.. py:attribute:: version
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:type: float
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The version number of the ICC standard that this profile follows
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(e.g. ``2.0``).
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.. py:attribute:: icc_version
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:type: int
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Same as ``version``, but in encoded format (see 7.2.4 of ICC.1:2010).
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.. py:attribute:: device_class
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:type: str
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4-character string identifying the profile class. One of
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``scnr``, ``mntr``, ``prtr``, ``link``, ``spac``, ``abst``,
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``nmcl`` (see 7.2.5 of ICC.1:2010 for details).
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.. py:attribute:: xcolor_space
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:type: str
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4-character string (padded with whitespace) identifying the color
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space, e.g. ``XYZ␣``, ``RGB␣`` or ``CMYK`` (see 7.2.6 of
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ICC.1:2010 for details).
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.. py:attribute:: connection_space
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:type: str
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4-character string (padded with whitespace) identifying the color
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space on the B-side of the transform (see 7.2.7 of ICC.1:2010 for
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details).
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.. py:attribute:: header_flags
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:type: int
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The encoded header flags of the profile (see 7.2.11 of ICC.1:2010
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for details).
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.. py:attribute:: header_manufacturer
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:type: str
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4-character string (padded with whitespace) identifying the device
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manufacturer, which shall match the signature contained in the
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appropriate section of the ICC signature registry found at
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www.color.org (see 7.2.12 of ICC.1:2010).
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.. py:attribute:: header_model
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:type: str
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4-character string (padded with whitespace) identifying the device
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model, which shall match the signature contained in the
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appropriate section of the ICC signature registry found at
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www.color.org (see 7.2.13 of ICC.1:2010).
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.. py:attribute:: attributes
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:type: int
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Flags used to identify attributes unique to the particular device
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setup for which the profile is applicable (see 7.2.14 of
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ICC.1:2010 for details).
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.. py:attribute:: rendering_intent
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:type: int
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The rendering intent to use when combining this profile with
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another profile (usually overridden at run-time, but provided here
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for DeviceLink and embedded source profiles, see 7.2.15 of ICC.1:2010).
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One of ``ImageCms.INTENT_ABSOLUTE_COLORIMETRIC``, ``ImageCms.INTENT_PERCEPTUAL``,
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``ImageCms.INTENT_RELATIVE_COLORIMETRIC`` and ``ImageCms.INTENT_SATURATION``.
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.. py:attribute:: profile_id
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:type: bytes
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A sequence of 16 bytes identifying the profile (via a specially
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constructed MD5 sum), or 16 binary zeroes if the profile ID has
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not been calculated (see 7.2.18 of ICC.1:2010).
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.. py:attribute:: copyright
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:type: Optional[str]
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The text copyright information for the profile (see 9.2.21 of ICC.1:2010).
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.. py:attribute:: manufacturer
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:type: Optional[str]
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The (English) display string for the device manufacturer (see
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9.2.22 of ICC.1:2010).
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.. py:attribute:: model
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:type: Optional[str]
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The (English) display string for the device model of the device
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for which this profile is created (see 9.2.23 of ICC.1:2010).
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.. py:attribute:: profile_description
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:type: Optional[str]
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The (English) display string for the profile description (see
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9.2.41 of ICC.1:2010).
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.. py:attribute:: target
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:type: Optional[str]
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The name of the registered characterization data set, or the
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measurement data for a characterization target (see 9.2.14 of
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ICC.1:2010).
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.. py:attribute:: red_colorant
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:type: Optional[tuple[tuple[float]]]
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The first column in the matrix used in matrix/TRC transforms (see 9.2.44 of ICC.1:2010).
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The value is in the format ``((X, Y, Z), (x, y, Y))``, if available.
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.. py:attribute:: green_colorant
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:type: Optional[tuple[tuple[float]]]
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The second column in the matrix used in matrix/TRC transforms (see 9.2.30 of ICC.1:2010).
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The value is in the format ``((X, Y, Z), (x, y, Y))``, if available.
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.. py:attribute:: blue_colorant
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:type: Optional[tuple[tuple[float]]]
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The third column in the matrix used in matrix/TRC transforms (see 9.2.4 of ICC.1:2010).
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The value is in the format ``((X, Y, Z), (x, y, Y))``, if available.
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.. py:attribute:: luminance
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:type: Optional[tuple[tuple[float]]]
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The absolute luminance of emissive devices in candelas per square
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metre as described by the Y channel (see 9.2.32 of ICC.1:2010).
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The value is in the format ``((X, Y, Z), (x, y, Y))``, if available.
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.. py:attribute:: chromaticity
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:type: Optional[tuple[tuple[float]]]
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The data of the phosphor/colorant chromaticity set used (red,
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green and blue channels, see 9.2.16 of ICC.1:2010).
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The value is in the format ``((x, y, Y), (x, y, Y), (x, y, Y))``, if available.
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.. py:attribute:: chromatic_adaption
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:type: tuple[tuple[float]]
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The chromatic adaption matrix converts a color measured using the
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actual illumination conditions and relative to the actual adopted
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white, to a color relative to the PCS adopted white, with
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complete adaptation from the actual adopted white chromaticity to
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the PCS adopted white chromaticity (see 9.2.15 of ICC.1:2010).
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Two 3-tuples of floats are returned in a 2-tuple,
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one in (X, Y, Z) space and one in (x, y, Y) space.
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.. py:attribute:: colorant_table
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:type: list[str]
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This tag identifies the colorants used in the profile by a unique
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name and set of PCSXYZ or PCSLAB values (see 9.2.19 of
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ICC.1:2010).
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.. py:attribute:: colorant_table_out
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:type: list[str]
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This tag identifies the colorants used in the profile by a unique
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name and set of PCSLAB values (for DeviceLink profiles only, see
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9.2.19 of ICC.1:2010).
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.. py:attribute:: colorimetric_intent
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:type: Optional[str]
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4-character string (padded with whitespace) identifying the image
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state of PCS colorimetry produced using the colorimetric intent
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transforms (see 9.2.20 of ICC.1:2010 for details).
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.. py:attribute:: perceptual_rendering_intent_gamut
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:type: Optional[str]
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4-character string (padded with whitespace) identifying the (one)
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standard reference medium gamut (see 9.2.37 of ICC.1:2010 for
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details).
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.. py:attribute:: saturation_rendering_intent_gamut
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:type: Optional[str]
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4-character string (padded with whitespace) identifying the (one)
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standard reference medium gamut (see 9.2.37 of ICC.1:2010 for
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details).
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.. py:attribute:: technology
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:type: Optional[str]
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4-character string (padded with whitespace) identifying the device
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technology (see 9.2.47 of ICC.1:2010 for details).
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.. py:attribute:: media_black_point
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:type: Optional[tuple[tuple[float]]]
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This tag specifies the media black point and is used for
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generating absolute colorimetry.
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This tag was available in ICC 3.2, but it is removed from
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version 4.
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The value is in the format ``((X, Y, Z), (x, y, Y))``, if available.
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.. py:attribute:: media_white_point_temperature
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:type: Optional[float]
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Calculates the white point temperature (see the LCMS documentation
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for more information).
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.. py:attribute:: viewing_condition
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:type: Optional[str]
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The (English) display string for the viewing conditions (see
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9.2.48 of ICC.1:2010).
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.. py:attribute:: screening_description
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:type: Optional[str]
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The (English) display string for the screening conditions.
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This tag was available in ICC 3.2, but it is removed from
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version 4.
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.. py:attribute:: red_primary
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:type: Optional[tuple[tuple[float]]]
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The XYZ-transformed of the RGB primary color red (1, 0, 0).
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The value is in the format ``((X, Y, Z), (x, y, Y))``, if available.
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.. py:attribute:: green_primary
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:type: Optional[tuple[tuple[float]]]
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The XYZ-transformed of the RGB primary color green (0, 1, 0).
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The value is in the format ``((X, Y, Z), (x, y, Y))``, if available.
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.. py:attribute:: blue_primary
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:type: Optional[tuple[tuple[float]]]
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The XYZ-transformed of the RGB primary color blue (0, 0, 1).
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The value is in the format ``((X, Y, Z), (x, y, Y))``, if available.
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.. py:attribute:: is_matrix_shaper
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:type: bool
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True if this profile is implemented as a matrix shaper (see
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documentation on LCMS).
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.. py:attribute:: clut
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:type: dict[tuple[bool]]
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Returns a dictionary of all supported intents and directions for
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the CLUT model.
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The dictionary is indexed by intents
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(``ImageCms.INTENT_ABSOLUTE_COLORIMETRIC``,
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``ImageCms.INTENT_PERCEPTUAL``,
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``ImageCms.INTENT_RELATIVE_COLORIMETRIC`` and
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``ImageCms.INTENT_SATURATION``).
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The values are 3-tuples indexed by directions
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(``ImageCms.DIRECTION_INPUT``, ``ImageCms.DIRECTION_OUTPUT``,
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``ImageCms.DIRECTION_PROOF``).
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The elements of the tuple are booleans. If the value is ``True``,
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that intent is supported for that direction.
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.. py:attribute:: intent_supported
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:type: dict[tuple[bool]]
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Returns a dictionary of all supported intents and directions.
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The dictionary is indexed by intents
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(``ImageCms.INTENT_ABSOLUTE_COLORIMETRIC``,
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``ImageCms.INTENT_PERCEPTUAL``,
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``ImageCms.INTENT_RELATIVE_COLORIMETRIC`` and
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``ImageCms.INTENT_SATURATION``).
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The values are 3-tuples indexed by directions
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(``ImageCms.DIRECTION_INPUT``, ``ImageCms.DIRECTION_OUTPUT``,
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``ImageCms.DIRECTION_PROOF``).
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The elements of the tuple are booleans. If the value is ``True``,
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that intent is supported for that direction.
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There is one function defined on the class:
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.. py:method:: is_intent_supported(intent, direction)
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Returns if the intent is supported for the given direction.
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Note that you can also get this information for all intents and directions
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with :py:attr:`.intent_supported`.
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:param intent: One of ``ImageCms.INTENT_ABSOLUTE_COLORIMETRIC``,
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``ImageCms.INTENT_PERCEPTUAL``,
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``ImageCms.INTENT_RELATIVE_COLORIMETRIC``
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and ``ImageCms.INTENT_SATURATION``.
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:param direction: One of ``ImageCms.DIRECTION_INPUT``,
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``ImageCms.DIRECTION_OUTPUT``
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and ``ImageCms.DIRECTION_PROOF``
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:return: Boolean if the intent and direction is supported.
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