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working tests for LAB color conversions using ImagingCMS

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This commit is contained in:
wiredfool 2013-10-15 22:04:51 -07:00
parent bde4613843
commit deb424c5cd
1 changed files with 30 additions and 3 deletions
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33
Tests/test_imagecms.py
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@ -95,6 +95,29 @@ def test_lab_color_profile():
pLab = ImageCms.createProfile("LAB", 5000) pLab = ImageCms.createProfile("LAB", 5000)
pLab = ImageCms.createProfile("LAB", 6500) pLab = ImageCms.createProfile("LAB", 6500)
def test_simple_lab():
i = Image.new('RGB', (10,10), (128,128,128))
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(SRGB, pLab, "RGB", "LAB")
i_lab = ImageCms.applyTransform(i, t)
assert_equal(i_lab.mode, 'LAB')
k = i_lab.getpixel((0,0))
assert_equal(k, (137,128,128)) # not a linear luminance map. so L != 128
L = i_lab.getdata(0)
a = i_lab.getdata(1)
b = i_lab.getdata(2)
assert_equal(list(L), [137]*100)
assert_equal(list(a), [128]*100)
assert_equal(list(b), [128]*100)
def test_lab_color(): def test_lab_color():
pLab = ImageCms.createProfile("LAB") pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(SRGB, pLab, "RGB", "LAB") t = ImageCms.buildTransform(SRGB, pLab, "RGB", "LAB")
@ -103,11 +126,11 @@ def test_lab_color():
i = ImageCms.applyTransform(lena(), t) i = ImageCms.applyTransform(lena(), t)
assert_image(i, "LAB", (128, 128)) assert_image(i, "LAB", (128, 128))
i.save('temp.lab.tif') # i.save('temp.lab.tif') # visually verified vs PS.
target = Image.open('Tests/images/lena.Lab.tif') target = Image.open('Tests/images/lena.Lab.tif')
assert_image_similar(i, target, 1) assert_image_similar(i, target, 30)
def test_lab_srgb(): def test_lab_srgb():
pLab = ImageCms.createProfile("LAB") pLab = ImageCms.createProfile("LAB")
@ -117,7 +140,9 @@ def test_lab_srgb():
img_srgb = ImageCms.applyTransform(img, t) img_srgb = ImageCms.applyTransform(img, t)
assert_image_similar(lena(), img_srgb, 1) # img_srgb.save('temp.srgb.tif') # visually verified vs ps.
assert_image_similar(lena(), img_srgb, 30)
def test_lab_roundtrip(): def test_lab_roundtrip():
# check to see if we're at least internally consistent. # check to see if we're at least internally consistent.
@ -130,3 +155,5 @@ def test_lab_roundtrip():
out = ImageCms.applyTransform(i, t2) out = ImageCms.applyTransform(i, t2)
assert_image_similar(lena(), out, 2) assert_image_similar(lena(), out, 2)