Merge branch 'feature/v0.4.0' into develop

colour-science · Aug 30, 2021 · 8237f16 · 8237f16
2 parents 1057d11 + 4b1a6d4
commit 8237f16
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diff --git a/colour/__init__.py b/colour/__init__.py
@@ -109,26 +109,27 @@
     CAM16UCS_to_JMh_CAM16, CAM16LCD_to_XYZ, CAM16SCD_to_XYZ, CAM16UCS_to_XYZ,
     CCTF_DECODINGS, CCTF_ENCODINGS, CMYK_to_CMY, CMY_to_CMYK, CMY_to_RGB,
     COLOURSPACE_MODELS, CV_range, DATA_MACADAM_1942_ELLIPSES, DIN99_to_Lab,
-    EOTFS, EOTF_INVERSES, HCL_to_RGB, HDR_CIELAB_METHODS, HDR_IPT_METHODS,
-    HSL_to_RGB, HSV_to_RGB, Hunter_Lab_to_XYZ, Hunter_Rdab_to_XYZ,
-    ICaCb_to_XYZ, ICtCp_to_RGB, ICtCp_to_XYZ, IHLS_to_RGB, IgPgTg_to_XYZ,
-    IPT_hue_angle, IPT_to_XYZ, JMh_CAM16_to_CAM16LCD, JMh_CAM16_to_CAM16SCD,
-    JMh_CAM16_to_CAM16UCS, JMh_CIECAM02_to_CAM02LCD, JMh_CIECAM02_to_CAM02SCD,
-    JMh_CIECAM02_to_CAM02UCS, JzAzBz_to_XYZ, LCHab_to_Lab, LCHuv_to_Luv,
-    LOG_DECODINGS, LOG_ENCODINGS, Lab_to_DIN99, Lab_to_LCHab, Lab_to_XYZ,
-    Luv_to_LCHuv, Luv_to_XYZ, Luv_to_uv, Luv_uv_to_xy, OETFS, OETF_INVERSES,
-    OOTFS, OOTF_INVERSES, OSA_UCS_to_XYZ, Oklab_to_XYZ, Prismatic_to_RGB,
-    RGB_COLOURSPACES, RGB_Colourspace, RGB_luminance, RGB_luminance_equation,
-    RGB_to_CMY, RGB_to_HCL, RGB_to_HSL, RGB_to_HSV, RGB_to_ICtCp, RGB_to_IHLS,
-    RGB_to_Prismatic, RGB_to_RGB, RGB_to_XYZ, RGB_to_YCbCr, RGB_to_YCoCg,
-    RGB_to_YcCbcCrc, UCS_to_XYZ, UCS_to_uv, UCS_uv_to_xy, UVW_to_XYZ,
-    WEIGHTS_YCBCR, XYZ_to_CAM02LCD, XYZ_to_CAM02SCD, XYZ_to_CAM02UCS,
-    XYZ_to_CAM16LCD, XYZ_to_CAM16SCD, XYZ_to_CAM16UCS, XYZ_to_Hunter_Lab,
-    XYZ_to_Hunter_Rdab, XYZ_to_ICaCb, XYZ_to_ICtCp, XYZ_to_IgPgTg, XYZ_to_IPT,
-    XYZ_to_JzAzBz, XYZ_to_K_ab_HunterLab1966, XYZ_to_Lab, XYZ_to_Luv,
-    XYZ_to_OSA_UCS, XYZ_to_Oklab, XYZ_to_RGB, XYZ_to_UCS, XYZ_to_UVW,
-    XYZ_to_hdr_CIELab, XYZ_to_hdr_IPT, XYZ_to_sRGB, XYZ_to_xy, XYZ_to_xyY,
-    YCbCr_to_RGB, YCoCg_to_RGB, YcCbcCrc_to_RGB, cctf_decoding, cctf_encoding,
+    DIN99_to_XYZ, EOTFS, EOTF_INVERSES, HCL_to_RGB, HDR_CIELAB_METHODS,
+    HDR_IPT_METHODS, HSL_to_RGB, HSV_to_RGB, Hunter_Lab_to_XYZ,
+    Hunter_Rdab_to_XYZ, ICaCb_to_XYZ, ICtCp_to_RGB, ICtCp_to_XYZ, IHLS_to_RGB,
+    IgPgTg_to_XYZ, IPT_hue_angle, IPT_to_XYZ, JMh_CAM16_to_CAM16LCD,
+    JMh_CAM16_to_CAM16SCD, JMh_CAM16_to_CAM16UCS, JMh_CIECAM02_to_CAM02LCD,
+    JMh_CIECAM02_to_CAM02SCD, JMh_CIECAM02_to_CAM02UCS, JzAzBz_to_XYZ,
+    LCHab_to_Lab, LCHuv_to_Luv, LOG_DECODINGS, LOG_ENCODINGS, Lab_to_DIN99,
+    Lab_to_LCHab, Lab_to_XYZ, Luv_to_LCHuv, Luv_to_XYZ, Luv_to_uv,
+    Luv_uv_to_xy, OETFS, OETF_INVERSES, OOTFS, OOTF_INVERSES, OSA_UCS_to_XYZ,
+    Oklab_to_XYZ, Prismatic_to_RGB, RGB_COLOURSPACES, RGB_Colourspace,
+    RGB_luminance, RGB_luminance_equation, RGB_to_CMY, RGB_to_HCL, RGB_to_HSL,
+    RGB_to_HSV, RGB_to_ICtCp, RGB_to_IHLS, RGB_to_Prismatic, RGB_to_RGB,
+    RGB_to_XYZ, RGB_to_YCbCr, RGB_to_YCoCg, RGB_to_YcCbcCrc, UCS_to_XYZ,
+    UCS_to_uv, UCS_uv_to_xy, UVW_to_XYZ, WEIGHTS_YCBCR, XYZ_to_CAM02LCD,
+    XYZ_to_CAM02SCD, XYZ_to_CAM02UCS, XYZ_to_CAM16LCD, XYZ_to_CAM16SCD,
+    XYZ_to_CAM16UCS, XYZ_to_DIN99, XYZ_to_Hunter_Lab, XYZ_to_Hunter_Rdab,
+    XYZ_to_ICaCb, XYZ_to_ICtCp, XYZ_to_IgPgTg, XYZ_to_IPT, XYZ_to_JzAzBz,
+    XYZ_to_K_ab_HunterLab1966, XYZ_to_Lab, XYZ_to_Luv, XYZ_to_OSA_UCS,
+    XYZ_to_Oklab, XYZ_to_RGB, XYZ_to_UCS, XYZ_to_UVW, XYZ_to_hdr_CIELab,
+    XYZ_to_hdr_IPT, XYZ_to_sRGB, XYZ_to_xy, XYZ_to_xyY, YCbCr_to_RGB,
+    YCoCg_to_RGB, YcCbcCrc_to_RGB, cctf_decoding, cctf_encoding,
     chromatically_adapted_primaries, eotf, eotf_inverse, full_to_legal,
     gamma_function, hdr_CIELab_to_XYZ, hdr_IPT_to_XYZ, legal_to_full,
     linear_function, log_decoding, log_encoding, matrix_RGB_to_RGB,
@@ -257,23 +258,12 @@ def __getattr__(self, attribute):
     'primitive_vertices'
 ]
 __all__ += [
-    'LUT1D',
-    'LUT3x1D',
-    'LUT3D',
-    'LUTSequence',
-    'READ_IMAGE_METHODS',
-    'SpectralDistribution_IESTM2714',
-    'WRITE_IMAGE_METHODS',
-    'read_image',
-    'read_LUT',
-    'read_sds_from_csv_file',
-    'read_sds_from_xrite_file',
-    'read_spectral_data_from_csv_file',
-    'SpectralDistribution_UPRTek',
-    'SpectralDistribution_Sekonic',
-    'write_image',
-    'write_LUT',
-    'write_sds_to_csv_file',
+    'LUT1D', 'LUT3x1D', 'LUT3D', 'LUTSequence', 'READ_IMAGE_METHODS',
+    'SpectralDistribution_IESTM2714', 'WRITE_IMAGE_METHODS', 'read_image',
+    'read_LUT', 'read_sds_from_csv_file', 'read_sds_from_xrite_file',
+    'read_spectral_data_from_csv_file', 'SpectralDistribution_UPRTek',
+    'SpectralDistribution_Sekonic', 'write_image', 'write_LUT',
+    'write_sds_to_csv_file'
 ]
 __all__ += [
     'CAM02LCD_to_JMh_CIECAM02', 'CAM02SCD_to_JMh_CIECAM02',
@@ -282,11 +272,11 @@ def __getattr__(self, attribute):
     'CAM16UCS_to_JMh_CAM16', 'CAM16LCD_to_XYZ', 'CAM16SCD_to_XYZ',
     'CAM16UCS_to_XYZ', 'CCTF_DECODINGS', 'CCTF_ENCODINGS', 'CMYK_to_CMY',
     'CMY_to_CMYK', 'CMY_to_RGB', 'COLOURSPACE_MODELS', 'CV_range',
-    'DATA_MACADAM_1942_ELLIPSES', 'DIN99_to_Lab', 'EOTFS', 'EOTF_INVERSES',
-    'HCL_to_RGB', 'HDR_CIELAB_METHODS', 'HDR_IPT_METHODS', 'HSL_to_RGB',
-    'HSV_to_RGB', 'Hunter_Lab_to_XYZ', 'Hunter_Rdab_to_XYZ', 'ICaCb_to_XYZ',
-    'ICtCp_to_RGB', 'ICtCp_to_XYZ', 'IHLS_to_RGB', 'IgPgTg_to_XYZ',
-    'IPT_hue_angle', 'IPT_to_XYZ', 'JMh_CAM16_to_CAM16LCD',
+    'DATA_MACADAM_1942_ELLIPSES', 'DIN99_to_Lab', 'DIN99_to_XYZ', 'EOTFS',
+    'EOTF_INVERSES', 'HCL_to_RGB', 'HDR_CIELAB_METHODS', 'HDR_IPT_METHODS',
+    'HSL_to_RGB', 'HSV_to_RGB', 'Hunter_Lab_to_XYZ', 'Hunter_Rdab_to_XYZ',
+    'ICaCb_to_XYZ', 'ICtCp_to_RGB', 'ICtCp_to_XYZ', 'IHLS_to_RGB',
+    'IgPgTg_to_XYZ', 'IPT_hue_angle', 'IPT_to_XYZ', 'JMh_CAM16_to_CAM16LCD',
     'JMh_CAM16_to_CAM16SCD', 'JMh_CAM16_to_CAM16UCS',
     'JMh_CIECAM02_to_CAM02LCD', 'JMh_CIECAM02_to_CAM02SCD',
     'JMh_CIECAM02_to_CAM02UCS', 'JzAzBz_to_XYZ', 'LCHab_to_Lab',
@@ -300,20 +290,20 @@ def __getattr__(self, attribute):
     'RGB_to_YCoCg', 'RGB_to_YcCbcCrc', 'UCS_to_XYZ', 'UCS_to_uv',
     'UCS_uv_to_xy', 'UVW_to_XYZ', 'WEIGHTS_YCBCR', 'XYZ_to_CAM02LCD',
     'XYZ_to_CAM02SCD', 'XYZ_to_CAM02UCS', 'XYZ_to_CAM16LCD', 'XYZ_to_CAM16SCD',
-    'XYZ_to_CAM16UCS', 'XYZ_to_Hunter_Lab', 'XYZ_to_Hunter_Rdab',
-    'XYZ_to_ICaCb', 'XYZ_to_ICtCp', 'XYZ_to_IgPgTg', 'XYZ_to_IPT',
-    'XYZ_to_JzAzBz', 'XYZ_to_K_ab_HunterLab1966', 'XYZ_to_Lab', 'XYZ_to_Luv',
-    'XYZ_to_OSA_UCS', 'XYZ_to_Oklab', 'XYZ_to_RGB', 'XYZ_to_UCS', 'XYZ_to_UVW',
-    'XYZ_to_hdr_CIELab', 'XYZ_to_hdr_IPT', 'XYZ_to_sRGB', 'XYZ_to_xy',
-    'XYZ_to_xyY', 'YCbCr_to_RGB', 'YCoCg_to_RGB', 'YcCbcCrc_to_RGB',
-    'cctf_decoding', 'cctf_encoding', 'chromatically_adapted_primaries',
-    'eotf', 'eotf_inverse', 'full_to_legal', 'gamma_function',
-    'hdr_CIELab_to_XYZ', 'hdr_IPT_to_XYZ', 'legal_to_full', 'linear_function',
-    'log_decoding', 'log_encoding', 'matrix_RGB_to_RGB', 'matrix_YCbCr',
-    'normalised_primary_matrix', 'oetf', 'oetf_inverse', 'offset_YCbCr',
-    'ootf', 'ootf_inverse', 'primaries_whitepoint', 'sRGB_to_XYZ', 'uv_to_Luv',
-    'uv_to_UCS', 'xyY_to_XYZ', 'xyY_to_xy', 'xy_to_Luv_uv', 'xy_to_UCS_uv',
-    'xy_to_XYZ', 'xy_to_xyY'
+    'XYZ_to_CAM16UCS', 'XYZ_to_DIN99', 'XYZ_to_Hunter_Lab',
+    'XYZ_to_Hunter_Rdab', 'XYZ_to_ICaCb', 'XYZ_to_ICtCp', 'XYZ_to_IgPgTg',
+    'XYZ_to_IPT', 'XYZ_to_JzAzBz', 'XYZ_to_K_ab_HunterLab1966', 'XYZ_to_Lab',
+    'XYZ_to_Luv', 'XYZ_to_OSA_UCS', 'XYZ_to_Oklab', 'XYZ_to_RGB', 'XYZ_to_UCS',
+    'XYZ_to_UVW', 'XYZ_to_hdr_CIELab', 'XYZ_to_hdr_IPT', 'XYZ_to_sRGB',
+    'XYZ_to_xy', 'XYZ_to_xyY', 'YCbCr_to_RGB', 'YCoCg_to_RGB',
+    'YcCbcCrc_to_RGB', 'cctf_decoding', 'cctf_encoding',
+    'chromatically_adapted_primaries', 'eotf', 'eotf_inverse', 'full_to_legal',
+    'gamma_function', 'hdr_CIELab_to_XYZ', 'hdr_IPT_to_XYZ', 'legal_to_full',
+    'linear_function', 'log_decoding', 'log_encoding', 'matrix_RGB_to_RGB',
+    'matrix_YCbCr', 'normalised_primary_matrix', 'oetf', 'oetf_inverse',
+    'offset_YCbCr', 'ootf', 'ootf_inverse', 'primaries_whitepoint',
+    'sRGB_to_XYZ', 'uv_to_Luv', 'uv_to_UCS', 'xyY_to_XYZ', 'xyY_to_xy',
+    'xy_to_Luv_uv', 'xy_to_UCS_uv', 'xy_to_XYZ', 'xy_to_xyY'
 ]
 __all__ += [
     'BRENEMAN_EXPERIMENTS', 'BRENEMAN_EXPERIMENT_PRIMARIES_CHROMATICITIES',

diff --git a/colour/graph/conversion.py b/colour/graph/conversion.py
@@ -29,24 +29,25 @@
 from colour.models import (
     CAM02LCD_to_JMh_CIECAM02, CAM02SCD_to_JMh_CIECAM02,
     CAM02UCS_to_JMh_CIECAM02, CAM16LCD_to_JMh_CAM16, CAM16SCD_to_JMh_CAM16,
-    CAM16UCS_to_JMh_CAM16, CMYK_to_CMY, CMY_to_CMYK, CMY_to_RGB, DIN99_to_Lab,
+    CAM16UCS_to_JMh_CAM16, CMYK_to_CMY, CMY_to_CMYK, CMY_to_RGB, DIN99_to_XYZ,
     HCL_to_RGB, HSL_to_RGB, HSV_to_RGB, Hunter_Lab_to_XYZ, Hunter_Rdab_to_XYZ,
     ICaCb_to_XYZ, ICtCp_to_XYZ, IHLS_to_RGB, IgPgTg_to_XYZ, IPT_to_XYZ,
     JMh_CAM16_to_CAM16LCD, JMh_CAM16_to_CAM16SCD, JMh_CAM16_to_CAM16UCS,
     JMh_CIECAM02_to_CAM02LCD, JMh_CIECAM02_to_CAM02SCD,
     JMh_CIECAM02_to_CAM02UCS, JzAzBz_to_XYZ, LCHab_to_Lab, LCHuv_to_Luv,
-    Lab_to_DIN99, Lab_to_LCHab, Lab_to_XYZ, Luv_to_LCHuv, Luv_to_XYZ,
-    Luv_to_uv, Luv_uv_to_xy, OSA_UCS_to_XYZ, Oklab_to_XYZ, Prismatic_to_RGB,
+    Lab_to_LCHab, Lab_to_XYZ, Luv_to_LCHuv, Luv_to_XYZ, Luv_to_uv,
+    Luv_uv_to_xy, OSA_UCS_to_XYZ, Oklab_to_XYZ, Prismatic_to_RGB,
     RGB_luminance, RGB_to_CMY, RGB_to_HCL, RGB_to_HSL, RGB_to_HSV, RGB_to_IHLS,
     RGB_to_Prismatic, RGB_to_RGB, RGB_to_XYZ, RGB_to_YCbCr, RGB_to_YCoCg,
     RGB_to_YcCbcCrc, UCS_to_XYZ, UCS_to_uv, UCS_uv_to_xy, UVW_to_XYZ,
-    XYZ_to_Hunter_Lab, XYZ_to_Hunter_Rdab, XYZ_to_ICaCb, XYZ_to_ICtCp,
-    XYZ_to_IgPgTg, XYZ_to_IPT, XYZ_to_JzAzBz, XYZ_to_Lab, XYZ_to_Luv,
-    XYZ_to_OSA_UCS, XYZ_to_Oklab, XYZ_to_RGB, XYZ_to_UCS, XYZ_to_UVW,
-    XYZ_to_hdr_CIELab, XYZ_to_hdr_IPT, XYZ_to_sRGB, XYZ_to_xy, XYZ_to_xyY,
-    YCbCr_to_RGB, YCoCg_to_RGB, YcCbcCrc_to_RGB, cctf_decoding, cctf_encoding,
-    hdr_CIELab_to_XYZ, hdr_IPT_to_XYZ, sRGB_to_XYZ, uv_to_Luv, uv_to_UCS,
-    xyY_to_XYZ, xyY_to_xy, xy_to_Luv_uv, xy_to_UCS_uv, xy_to_XYZ, xy_to_xyY)
+    XYZ_to_DIN99, XYZ_to_Hunter_Lab, XYZ_to_Hunter_Rdab, XYZ_to_ICaCb,
+    XYZ_to_ICtCp, XYZ_to_IgPgTg, XYZ_to_IPT, XYZ_to_JzAzBz, XYZ_to_Lab,
+    XYZ_to_Luv, XYZ_to_OSA_UCS, XYZ_to_Oklab, XYZ_to_RGB, XYZ_to_UCS,
+    XYZ_to_UVW, XYZ_to_hdr_CIELab, XYZ_to_hdr_IPT, XYZ_to_sRGB, XYZ_to_xy,
+    XYZ_to_xyY, YCbCr_to_RGB, YCoCg_to_RGB, YcCbcCrc_to_RGB, cctf_decoding,
+    cctf_encoding, hdr_CIELab_to_XYZ, hdr_IPT_to_XYZ, sRGB_to_XYZ, uv_to_Luv,
+    uv_to_UCS, xyY_to_XYZ, xyY_to_xy, xy_to_Luv_uv, xy_to_UCS_uv, xy_to_XYZ,
+    xy_to_xyY)
 from colour.notation import (HEX_to_RGB, RGB_to_HEX, munsell_value,
                              munsell_colour_to_xyY, xyY_to_munsell_colour)
 from colour.quality import colour_quality_scale, colour_rendering_index
@@ -383,8 +384,8 @@ def RGB_luminance_to_RGB(Y):
     ('CIE xy', 'CIE UCS uv', xy_to_UCS_uv),
     ('CIE XYZ', 'CIE UVW', XYZ_to_UVW),
     ('CIE UVW', 'CIE XYZ', UVW_to_XYZ),
-    ('CIE Lab', 'DIN99', Lab_to_DIN99),
-    ('DIN99', 'CIE Lab', DIN99_to_Lab),
+    ('CIE XYZ', 'DIN99', XYZ_to_DIN99),
+    ('DIN99', 'CIE XYZ', DIN99_to_XYZ),
     ('CIE XYZ', 'hdr-CIELAB', XYZ_to_hdr_CIELab),
     ('hdr-CIELAB', 'CIE XYZ', hdr_CIELab_to_XYZ),
     ('CIE XYZ', 'Hunter Lab',
@@ -629,8 +630,8 @@ def _conversion_path(source, target):
     --------
     >>> _conversion_path('cie lab', 'cct')
     ... # doctest: +ELLIPSIS
-    [<function Lab_to_XYZ at 0x...>, <function XYZ_to_UCS at 0x...>, \
-<function UCS_to_uv at 0x...>, <function uv_to_CCT at 0x...>]
+    [<function Lab_to_XYZ at 0x...>, <function XYZ_to_xy at 0x...>, \
+<function xy_to_UCS_uv at 0x...>, <function uv_to_CCT at 0x...>]
     """
 
     import colour

diff --git a/colour/models/__init__.py b/colour/models/__init__.py
@@ -25,7 +25,7 @@
 from .cie_ucs import (XYZ_to_UCS, UCS_to_XYZ, UCS_to_uv, uv_to_UCS,
                       UCS_uv_to_xy, xy_to_UCS_uv)
 from .cie_uvw import XYZ_to_UVW, UVW_to_XYZ
-from .din99 import Lab_to_DIN99, DIN99_to_Lab
+from .din99 import Lab_to_DIN99, DIN99_to_Lab, XYZ_to_DIN99, DIN99_to_XYZ
 from .hdr_cie_lab import (HDR_CIELAB_METHODS, XYZ_to_hdr_CIELab,
                           hdr_CIELab_to_XYZ)
 from .hunter_lab import (XYZ_to_K_ab_HunterLab1966, XYZ_to_Hunter_Lab,
@@ -74,7 +74,7 @@
     'xy_to_UCS_uv'
 ]
 __all__ += ['XYZ_to_UVW', 'UVW_to_XYZ']
-__all__ += ['Lab_to_DIN99', 'DIN99_to_Lab']
+__all__ += ['Lab_to_DIN99', 'DIN99_to_Lab', 'XYZ_to_DIN99', 'DIN99_to_XYZ']
 __all__ += ['HDR_CIELAB_METHODS', 'XYZ_to_hdr_CIELab', 'hdr_CIELab_to_XYZ']
 __all__ += [
     'XYZ_to_K_ab_HunterLab1966', 'XYZ_to_Hunter_Lab', 'Hunter_Lab_to_XYZ',

diff --git a/colour/models/common.py b/colour/models/common.py
@@ -167,7 +167,7 @@ def JCh_to_Jab(JCh):
 
 COLOURSPACE_MODELS = ('CAM02LCD', 'CAM02SCD', 'CAM02UCS', 'CAM16LCD',
                       'CAM16SCD', 'CAM16UCS', 'CIE XYZ', 'CIE xyY', 'CIE Lab',
-                      'CIE Luv', 'CIE UCS', 'CIE UVW', 'Hunter Lab',
+                      'CIE Luv', 'CIE UCS', 'CIE UVW', 'DIN99', 'Hunter Lab',
                       'Hunter Rdab', 'ICaCb', 'ICtCp', 'IPT', 'IgPgTg',
                       'JzAzBz', 'OSA UCS', 'Oklab', 'hdr-CIELAB', 'hdr-IPT')
 if is_documentation_building():  # pragma: no cover
@@ -178,7 +178,7 @@ def JCh_to_Jab(JCh):
 
 COLOURSPACE_MODELS : Tuple
     **{'CAM02LCD', 'CAM02SCD', 'CAM02UCS', 'CAM16LCD', 'CAM16SCD', 'CAM16UCS',
-    'CIE XYZ', 'CIE xyY', 'CIE Lab', 'CIE Luv', 'CIE UCS', 'CIE UVW',
+    'CIE XYZ', 'CIE xyY', 'CIE Lab', 'CIE Luv', 'CIE UCS', 'CIE UVW', 'DIN99',
     'Hunter Lab', 'Hunter Rdab', 'ICaCb', 'ICtCp', 'IPT', 'IgPgTg', 'JzAzBz',
     'OSA UCS', 'Oklab', 'hdr-CIELAB', 'hdr-IPT'}**
 """
@@ -196,6 +196,7 @@ def JCh_to_Jab(JCh):
     'CIE Luv': ('$L^*$', '$u^\\prime$', '$v^\\prime$'),
     'CIE UCS': ('U', 'V', 'W'),
     'CIE UVW': ('U', 'V', 'W'),
+    'DIN99': ('$L_{99}$', '$a_{99}$', '$b_{99}$'),
     'Hunter Lab': ('$L^*$', '$a^*$', '$b^*$'),
     'Hunter Rdab': ('Rd', 'a', 'b'),
     'ICaCb': ('$I$', '$C_a$', '$C_b$'),
@@ -213,7 +214,7 @@ def JCh_to_Jab(JCh):
 
 COLOURSPACE_MODELS_AXIS_LABELS : dict
     **{'CAM02LCD', 'CAM02SCD', 'CAM02UCS', 'CAM16LCD', 'CAM16SCD', 'CAM16UCS',
-    'CIE XYZ', 'CIE xyY', 'CIE Lab', 'CIE Luv', 'CIE UCS', 'CIE UVW',
+    'CIE XYZ', 'CIE xyY', 'CIE Lab', 'CIE Luv', 'CIE UCS', 'CIE UVW', 'DIN99',
     'Hunter Lab', 'Hunter Rdab', 'ICaCb', 'ICtCp', 'IPT', 'IgPgTg', 'JzAzBz',
     'OSA UCS', 'Oklab', 'hdr-CIELAB', 'hdr-IPT'}**
 """