ImageCms
Module¶
The ImageCms
module provides color profile management
support using the LittleCMS2 color management engine, based on Kevin
Cazabon’s PyCMS library.
CmsProfile¶
The ICC color profiles are wrapped in an instance of the class
CmsProfile
. The specification ICC.1:2010 contains more
information about the meaning of the values in ICC profiles.
For convenience, all XYZ-values are also given as xyY-values (so they can be easily displayed in a chromaticity diagram, for example).
-
class
PIL.ImageCms.
CmsProfile
¶ -
creation_date
¶ Date and time this profile was first created (see 7.2.1 of ICC.1:2010).
Type: datetime.datetime
orNone
-
icc_version
¶ Same as version, but in encoded format (see 7.2.4 of ICC.1:2010).
-
device_class
¶ 4-character string identifying the profile class. One of
scnr
,mntr
,prtr
,link
,spac
,abst
,nmcl
(see 7.2.5 of ICC.1:2010 for details).Type: string
-
xcolor_space
¶ 4-character string (padded with whitespace) identifying the color space, e.g.
XYZ␣
,RGB␣
orCMYK
(see 7.2.6 of ICC.1:2010 for details).Note that the deprecated attribute
color_space
contains an interpreted (non-padded) variant of this (but can be empty on unknown input).Type: string
-
connection_space
¶ 4-character string (padded with whitespace) identifying the color space on the B-side of the transform (see 7.2.7 of ICC.1:2010 for details).
Note that the deprecated attribute
pcs
contains an interpreted (non-padded) variant of this (but can be empty on unknown input).Type: string
-
header_flags
¶ The encoded header flags of the profile (see 7.2.11 of ICC.1:2010 for details).
Type: int
-
header_manufacturer
¶ 4-character string (padded with whitespace) identifying the device manufacturer, which shall match the signature contained in the appropriate section of the ICC signature registry found at www.color.org (see 7.2.12 of ICC.1:2010).
Type: string
-
header_model
¶ 4-character string (padded with whitespace) identifying the device model, which shall match the signature contained in the appropriate section of the ICC signature registry found at www.color.org (see 7.2.13 of ICC.1:2010).
Type: string
-
attributes
¶ Flags used to identify attributes unique to the particular device setup for which the profile is applicable (see 7.2.14 of ICC.1:2010 for details).
Type: int
-
rendering_intent
¶ The rendering intent to use when combining this profile with another profile (usually overridden at run-time, but provided here for DeviceLink and embedded source profiles, see 7.2.15 of ICC.1:2010).
One of
ImageCms.INTENT_ABSOLUTE_COLORIMETRIC
,ImageCms.INTENT_PERCEPTUAL
,ImageCms.INTENT_RELATIVE_COLORIMETRIC
andImageCms.INTENT_SATURATION
.Type: int
-
profile_id
¶ A sequence of 16 bytes identifying the profile (via a specially constructed MD5 sum), or 16 binary zeroes if the profile ID has not been calculated (see 7.2.18 of ICC.1:2010).
Type: bytes
-
copyright
¶ The text copyright information for the profile (see 9.2.21 of ICC.1:2010).
Type: unicode
orNone
-
manufacturer
¶ The (english) display string for the device manufacturer (see 9.2.22 of ICC.1:2010).
Type: unicode
orNone
-
model
¶ The (english) display string for the device model of the device for which this profile is created (see 9.2.23 of ICC.1:2010).
Type: unicode
orNone
-
profile_description
¶ The (english) display string for the profile description (see 9.2.41 of ICC.1:2010).
Type: unicode
orNone
-
target
¶ The name of the registered characterization data set, or the measurement data for a characterization target (see 9.2.14 of ICC.1:2010).
Type: unicode
orNone
-
red_colorant
¶ The first column in the matrix used in matrix/TRC transforms (see 9.2.44 of ICC.1:2010).
Type: ((X, Y, Z), (x, y, Y))
orNone
-
green_colorant
¶ The second column in the matrix used in matrix/TRC transforms (see 9.2.30 of ICC.1:2010).
Type: ((X, Y, Z), (x, y, Y))
orNone
-
blue_colorant
¶ The third column in the matrix used in matrix/TRC transforms (see 9.2.4 of ICC.1:2010).
Type: ((X, Y, Z), (x, y, Y))
orNone
-
luminance
¶ The absolute luminance of emissive devices in candelas per square metre as described by the Y channel (see 9.2.32 of ICC.1:2010).
Type: ((X, Y, Z), (x, y, Y))
orNone
-
chromaticity
¶ The data of the phosphor/colorant chromaticity set used (red, green and blue channels, see 9.2.16 of ICC.1:2010).
Type: ((x, y, Y), (x, y, Y), (x, y, Y))
orNone
-
chromatic_adaption
¶ The chromatic adaption matrix converts a color measured using the actual illumination conditions and relative to the actual adopted white, to an color relative to the PCS adopted white, with complete adaptation from the actual adopted white chromaticity to the PCS adopted white chromaticity (see 9.2.15 of ICC.1:2010).
Two matrices are returned, one in (X, Y, Z) space and one in (x, y, Y) space.
Type: 2-tuple of 3-tuple, the first with (X, Y, Z) and the second with (x, y, Y) values
-
colorant_table
¶ This tag identifies the colorants used in the profile by a unique name and set of PCSXYZ or PCSLAB values (see 9.2.19 of ICC.1:2010).
Type: list of strings
-
colorant_table_out
¶ This tag identifies the colorants used in the profile by a unique name and set of PCSLAB values (for DeviceLink profiles only, see 9.2.19 of ICC.1:2010).
Type: list of strings
-
colorimetric_intent
¶ 4-character string (padded with whitespace) identifying the image state of PCS colorimetry produced using the colorimetric intent transforms (see 9.2.20 of ICC.1:2010 for details).
Type: string
orNone
-
perceptual_rendering_intent_gamut
¶ 4-character string (padded with whitespace) identifying the (one) standard reference medium gamut (see 9.2.37 of ICC.1:2010 for details).
Type: string
orNone
-
saturation_rendering_intent_gamut
¶ 4-character string (padded with whitespace) identifying the (one) standard reference medium gamut (see 9.2.37 of ICC.1:2010 for details).
Type: string
orNone
-
technology
¶ 4-character string (padded with whitespace) identifying the device technology (see 9.2.47 of ICC.1:2010 for details).
Type: string
orNone
-
media_black_point
¶ This tag specifies the media black point and is used for generating absolute colorimetry.
This tag was available in ICC 3.2, but it is removed from version 4.
Type: ((X, Y, Z), (x, y, Y))
orNone
-
media_white_point_temperature
¶ Calculates the white point temperature (see the LCMS documentation for more information).
Type: float
orNone
-
viewing_condition
¶ The (english) display string for the viewing conditions (see 9.2.48 of ICC.1:2010).
Type: unicode
orNone
-
screening_description
¶ The (english) display string for the screening conditions.
This tag was available in ICC 3.2, but it is removed from version 4.
Type: unicode
orNone
-
red_primary
¶ The XYZ-transformed of the RGB primary color red (1, 0, 0).
Type: ((X, Y, Z), (x, y, Y))
orNone
-
green_primary
¶ The XYZ-transformed of the RGB primary color green (0, 1, 0).
Type: ((X, Y, Z), (x, y, Y))
orNone
-
blue_primary
¶ The XYZ-transformed of the RGB primary color blue (0, 0, 1).
Type: ((X, Y, Z), (x, y, Y))
orNone
-
is_matrix_shaper
¶ True if this profile is implemented as a matrix shaper (see documentation on LCMS).
Type: bool
-
clut
¶ Returns a dictionary of all supported intents and directions for the CLUT model.
The dictionary is indexed by intents (
ImageCms.INTENT_ABSOLUTE_COLORIMETRIC
,ImageCms.INTENT_PERCEPTUAL
,ImageCms.INTENT_RELATIVE_COLORIMETRIC
andImageCms.INTENT_SATURATION
).The values are 3-tuples indexed by directions (
ImageCms.DIRECTION_INPUT
,ImageCms.DIRECTION_OUTPUT
,ImageCms.DIRECTION_PROOF
).The elements of the tuple are booleans. If the value is
True
, that intent is supported for that direction.Type: dict
of boolean 3-tuples
-
intent_supported
¶ Returns a dictionary of all supported intents and directions.
The dictionary is indexed by intents (
ImageCms.INTENT_ABSOLUTE_COLORIMETRIC
,ImageCms.INTENT_PERCEPTUAL
,ImageCms.INTENT_RELATIVE_COLORIMETRIC
andImageCms.INTENT_SATURATION
).The values are 3-tuples indexed by directions (
ImageCms.DIRECTION_INPUT
,ImageCms.DIRECTION_OUTPUT
,ImageCms.DIRECTION_PROOF
).The elements of the tuple are booleans. If the value is
True
, that intent is supported for that direction.Type: dict
of boolean 3-tuples
-
color_space
¶ Deprecated but retained for backwards compatibility. Interpreted value of
xcolor_space
. May be the empty string if value could not be decoded.Type: string
-
pcs
¶ Deprecated but retained for backwards compatibility. Interpreted value of
connection_space
. May be the empty string if value could not be decoded.Type: string
-
product_model
¶ Deprecated but retained for backwards compatibility. ASCII-encoded value of
model
.Type: string
-
product_manufacturer
¶ Deprecated but retained for backwards compatibility. ASCII-encoded value of
manufacturer
.Type: string
-
product_copyright
¶ Deprecated but retained for backwards compatibility. ASCII-encoded value of
copyright
.Type: string
-
product_description
¶ Deprecated but retained for backwards compatibility. ASCII-encoded value of
profile_description
.Type: string
-
product_desc
¶ Deprecated but retained for backwards compatibility. ASCII-encoded value of
profile_description
.This alias of
product_description
used to contain a derived informative string about the profile, depending on the value of the description, copyright, manufacturer and model fields).Type: string
There is one function defined on the class:
-
is_intent_supported
(intent, direction)¶ Returns if the intent is supported for the given direction.
Note that you can also get this information for all intents and directions with
intent_supported
.Parameters: - intent – One of
ImageCms.INTENT_ABSOLUTE_COLORIMETRIC
,ImageCms.INTENT_PERCEPTUAL
,ImageCms.INTENT_RELATIVE_COLORIMETRIC
andImageCms.INTENT_SATURATION
. - direction – One of
ImageCms.DIRECTION_INPUT
,ImageCms.DIRECTION_OUTPUT
andImageCms.DIRECTION_PROOF
Returns: Boolean if the intent and direction is supported.
- intent – One of
-