Pillow/Tests/test_format_hsv.py

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from __future__ import annotations
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import colorsys
import itertools
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from typing import Callable
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from PIL import Image
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from .helper import assert_image_similar, hopper
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def int_to_float(i: int) -> float:
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return i / 255
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def tuple_to_ints(tp: tuple[float, float, float]) -> tuple[int, int, int]:
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x, y, z = tp
return int(x * 255.0), int(y * 255.0), int(z * 255.0)
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def test_sanity() -> None:
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Image.new("HSV", (100, 100))
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def wedge() -> Image.Image:
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w = Image._wedge()
w90 = w.rotate(90)
(px, h) = w.size
r = Image.new("L", (px * 3, h))
g = r.copy()
b = r.copy()
r.paste(w, (0, 0))
r.paste(w90, (px, 0))
g.paste(w90, (0, 0))
g.paste(w, (2 * px, 0))
b.paste(w, (px, 0))
b.paste(w90, (2 * px, 0))
img = Image.merge("RGB", (r, g, b))
return img
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def to_xxx_colorsys(
im: Image.Image,
func: Callable[[float, float, float], tuple[float, float, float]],
mode: str,
) -> Image.Image:
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# convert the hard way using the library colorsys routines.
(r, g, b) = im.split()
conv_func = int_to_float
converted = [
tuple_to_ints(func(conv_func(_r), conv_func(_g), conv_func(_b)))
for (_r, _g, _b) in itertools.zip_longest(r.tobytes(), g.tobytes(), b.tobytes())
]
new_bytes = b"".join(
bytes(chr(h) + chr(s) + chr(v), "latin-1") for (h, s, v) in converted
)
hsv = Image.frombytes(mode, r.size, new_bytes)
return hsv
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def to_hsv_colorsys(im: Image.Image) -> Image.Image:
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return to_xxx_colorsys(im, colorsys.rgb_to_hsv, "HSV")
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def to_rgb_colorsys(im: Image.Image) -> Image.Image:
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return to_xxx_colorsys(im, colorsys.hsv_to_rgb, "RGB")
def test_wedge() -> None:
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src = wedge().resize((3 * 32, 32), Image.Resampling.BILINEAR)
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im = src.convert("HSV")
comparable = to_hsv_colorsys(src)
assert_image_similar(
im.getchannel(0), comparable.getchannel(0), 1, "Hue conversion is wrong"
)
assert_image_similar(
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im.getchannel(1),
comparable.getchannel(1),
1,
"Saturation conversion is wrong",
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)
assert_image_similar(
im.getchannel(2), comparable.getchannel(2), 1, "Value conversion is wrong"
)
comparable = src
im = im.convert("RGB")
assert_image_similar(
im.getchannel(0), comparable.getchannel(0), 3, "R conversion is wrong"
)
assert_image_similar(
im.getchannel(1), comparable.getchannel(1), 3, "G conversion is wrong"
)
assert_image_similar(
im.getchannel(2), comparable.getchannel(2), 3, "B conversion is wrong"
)
def test_convert() -> None:
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im = hopper("RGB").convert("HSV")
comparable = to_hsv_colorsys(hopper("RGB"))
assert_image_similar(
im.getchannel(0), comparable.getchannel(0), 1, "Hue conversion is wrong"
)
assert_image_similar(
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im.getchannel(1),
comparable.getchannel(1),
1,
"Saturation conversion is wrong",
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)
assert_image_similar(
im.getchannel(2), comparable.getchannel(2), 1, "Value conversion is wrong"
)
def test_hsv_to_rgb() -> None:
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comparable = to_hsv_colorsys(hopper("RGB"))
converted = comparable.convert("RGB")
comparable = to_rgb_colorsys(comparable)
assert_image_similar(
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converted.getchannel(0),
comparable.getchannel(0),
3,
"R conversion is wrong",
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)
assert_image_similar(
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converted.getchannel(1),
comparable.getchannel(1),
3,
"G conversion is wrong",
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)
assert_image_similar(
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converted.getchannel(2),
comparable.getchannel(2),
3,
"B conversion is wrong",
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)