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Deprecate non-image ImageCms modes #8031

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Jun 28, 2024
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Deprecate non-image ImageCms modes #8031

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9 changes: 8 additions & 1 deletion Tests/test_imagecms.py
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Original file line number Diff line number Diff line change
Expand Up @@ -678,7 +678,8 @@ def test_auxiliary_channels_isolated() -> None:

def test_long_modes() -> None:
p = ImageCms.getOpenProfile("Tests/icc/sGrey-v2-nano.icc")
ImageCms.buildTransform(p, p, "ABCDEFGHI", "ABCDEFGHI")
with pytest.warns(DeprecationWarning):
ImageCms.buildTransform(p, p, "ABCDEFGHI", "ABCDEFGHI")


@pytest.mark.parametrize("mode", ("RGB", "RGBA", "RGBX"))
Expand All @@ -699,3 +700,9 @@ def test_deprecation() -> None:
assert ImageCms.VERSION == "1.0.0 pil"
with pytest.warns(DeprecationWarning):
assert isinstance(ImageCms.FLAGS, dict)

profile = ImageCmsProfile(ImageCms.createProfile("sRGB"))
with pytest.warns(DeprecationWarning):
ImageCms.ImageCmsTransform(profile, profile, "RGBA;16B", "RGB")
with pytest.warns(DeprecationWarning):
ImageCms.ImageCmsTransform(profile, profile, "RGB", "RGBA;16B")
9 changes: 9 additions & 0 deletions docs/deprecations.rst
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Expand Up @@ -107,6 +107,15 @@ BGR;15, BGR 16 and BGR;24

The experimental BGR;15, BGR;16 and BGR;24 modes have been deprecated.

Non-image modes in ImageCms
^^^^^^^^^^^^^^^^^^^^^^^^^^^

.. deprecated:: 10.4.0

The use in :py:mod:`.ImageCms` of input modes and output modes that are not Pillow
image modes has been deprecated. Defaulting to "L" or "1" if the mode cannot be mapped
is also deprecated.

Support for LibTIFF earlier than 4
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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7 changes: 7 additions & 0 deletions docs/releasenotes/10.4.0.rst
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Expand Up @@ -28,6 +28,13 @@ BGR;15, BGR 16 and BGR;24

The experimental BGR;15, BGR;16 and BGR;24 modes have been deprecated.

Non-image modes in ImageCms
^^^^^^^^^^^^^^^^^^^^^^^^^^^

The use in :py:mod:`.ImageCms` of input modes and output modes that are not Pillow
image modes has been deprecated. Defaulting to "L" or "1" if the mode cannot be mapped
is also deprecated.

Support for LibTIFF earlier than 4
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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25 changes: 25 additions & 0 deletions src/PIL/ImageCms.py
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Expand Up @@ -299,6 +299,31 @@ def __init__(
proof_intent: Intent = Intent.ABSOLUTE_COLORIMETRIC,
flags: Flags = Flags.NONE,
):
supported_modes = (
"RGB",
"RGBA",
"RGBX",
"CMYK",
"I;16",
"I;16L",
"I;16B",
"YCbCr",
"LAB",
"L",
"1",
)
for mode in (input_mode, output_mode):
if mode not in supported_modes:
deprecate(
mode,
12,
{
"L;16": "I;16 or I;16L",
"L:16B": "I;16B",
"YCCA": "YCbCr",
"YCC": "YCbCr",
}.get(mode),
)
if proof is None:
self.transform = core.buildTransform(
input.profile, output.profile, input_mode, output_mode, intent, flags
Expand Down
10 changes: 6 additions & 4 deletions src/_imagingcms.c
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Original file line number Diff line number Diff line change
Expand Up @@ -223,20 +223,22 @@ findLCMStype(char *PILmode) {
if (strcmp(PILmode, "CMYK") == 0) {
return TYPE_CMYK_8;
}
if (strcmp(PILmode, "L;16") == 0) {
if (strcmp(PILmode, "I;16") == 0 || strcmp(PILmode, "I;16L") == 0 ||
strcmp(PILmode, "L;16") == 0) {
return TYPE_GRAY_16;
}
if (strcmp(PILmode, "L;16B") == 0) {
if (strcmp(PILmode, "I;16B") == 0 || strcmp(PILmode, "L;16B") == 0) {
return TYPE_GRAY_16_SE;
}
if (strcmp(PILmode, "YCCA") == 0 || strcmp(PILmode, "YCC") == 0) {
if (strcmp(PILmode, "YCbCr") == 0 || strcmp(PILmode, "YCCA") == 0 ||
strcmp(PILmode, "YCC") == 0) {
return TYPE_YCbCr_8;
}
if (strcmp(PILmode, "LAB") == 0) {
// LabX equivalent like ALab, but not reversed -- no #define in lcms2
return (COLORSPACE_SH(PT_LabV2) | CHANNELS_SH(3) | BYTES_SH(1) | EXTRA_SH(1));
}
/* presume "L" by default */
/* presume "1" or "L" by default */
return TYPE_GRAY_8;
}

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