def _d_cb(cb):
"""Returns D(Cb) - Cb"""
cb = float(cb) / 255
if cb <= .25:
d = ((16 * cb - 12) * cb + 4) * cb
else:
d = math.sqrt(cb)
return round((d - cb) * 255)
LUT_1_2_x_cs = [util.clip(255 - 2 * i) for i in range(256)]
LUT_cb_x_1_cb = [round(util.clip(i * (1 - i / 255))) for i in range(256)]
LUT_2_x_cs_1 = [util.clip(2 * i - 255) for i in range(256)]
LUT_d_cb = [_d_cb(i) for i in range(256)]
def _soft_light(im1, im2):
"""The soft light blend mode.
Arguments:
im1: A backdrop image (RGB).
im2: A source image (RGB).
Returns:
The output image.
"""
def test_clip_min_minus_1000():
assert util.clip(-1000, a_min=-1000) == -1000
assert util.clip(-1001, a_min=-1000) == -1000
def test_clip_max_1000():
assert util.clip(1000, a_max=1000) == 1000
assert util.clip(1001, a_max=1000) == 1000
def test_clip_256():
assert util.clip(256) == 255
def test_clip_255():
assert util.clip(255) == 255
def test_clip_0():
assert util.clip(0) == 0
def test_clip_minus_1():
assert util.clip(-1) == 0
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import numpy as np
from PIL import Image, ImageChops
from pilgram.css.blending.alpha import alpha_blend
from pilgram import util
LUT_2x = [util.clip(2 * i) for i in range(256)]
LUT_2x_1 = [util.clip(2 * i - 255) for i in range(256)]
def _hard_light(im1, im2):
"""The hard light blend mode.
Arguments:
im1: A backdrop image (RGB).
im2: A source image (RGB).
Returns:
The output image.
"""
im2_multiply = util.apply_lut(im2, LUT_2x)