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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from copy import deepcopy
import os
import sys
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
from DisplayCAL.colormath import (
RGB2XYZ,
convert_range,
get_rgb_space,
get_whitepoint,
specialpow,
)
from DisplayCAL.icc_profile import (
create_synthetic_clut_profile,
ICCProfile,
LUT16Type,
XYZType,
)
def create_rendering_intent_test_profile(
filename, add_fallback_matrix=True, generate_B2A_tables=True, swap=False
):
desc = "Rendering Intent Test Profile"
if not add_fallback_matrix:
desc += " (cLUT only)"
else:
desc += " (cLUT + fallback matrix)"
srgb = get_rgb_space("sRGB")
if swap:
rgb_space = list(srgb)
rgb_space[2:5] = rgb_space[3], rgb_space[4], rgb_space[2]
rgb_space = get_rgb_space(rgb_space)
else:
rgb_space = srgb
clutres = 9 # Minimum 9 because we require f >= 2
f = int(round((clutres - 1) / 4.0))
p = create_synthetic_clut_profile(rgb_space, desc, clutres=clutres)
tagnames = ["A2B"]
if generate_B2A_tables:
p.tags.B2A0.clut = []
tagnames.append("B2A")
else:
del p.tags["B2A0"]
for i in range(1, 3):
for tagname in tagnames:
tag0 = p.tags[tagname + "0"]
tag = p.tags[tagname + "%i" % i] = LUT16Type()
for component_name in ("matrix", "input", "clut", "output"):
component = getattr(tag0, component_name)
if component_name == "clut":
component = deepcopy(component)
setattr(tag, component_name, component)
for i in range(3):
for tagname in tagnames:
tag = p.tags[tagname + "%i" % i]
if i == 0:
# Perceptual
RGB = (f, f, 0)
elif i == 1:
# Colorimetric
RGB = (0, f, f)
else:
# Saturation
RGB = (0, f, 0)
block = 0
for R in range(clutres):
r = min(max(R, f), clutres - 2)
b1 = min(max(R, f) + 1, clutres - 2)
b2 = min(max(R - 1, f), clutres - 2)
for G in range(clutres):
if tagname == "B2A":
tag.clut.append([])
for B in range(clutres):
if tagname == "B2A":
tag.clut[block].append(
[v / (clutres - 1.0) * 65535 for v in (R, G, B)]
)
# Everything should be good as long as primaries
# are sensible (otherwise, when embedded in a PNG,
# some programs like Firefox and XnView will ignore
# the profile. This doesn't happen when embedded in
# JPEG. Go figure...)
if (R, G, B) in (
(f, f, 0),
(0, f, f),
(0, f, 0),
# Magenta 64..223
(r, 0, r),
(r, 0, b1),
(r, 0, b2),
# Red 64..223
(r, 0, 0),
(r, 0, 1),
(r, 1, 0),
# CMY 255
(0, clutres - 1, clutres - 1),
(clutres - 1, 0, clutres - 1),
(clutres - 1, clutres - 1, 0),
):
if (R, G, B) == (0, clutres - 1, clutres - 1):
# Map C -> R
if tagname == "B2A":
triplet = (65535, 0, 0)
else:
triplet = RGB2XYZ(1, 0, 0, scale=32768)
elif (R, G, B) == (clutres - 1, 0, clutres - 1):
# Map M -> G
if tagname == "B2A":
triplet = (0, 65535, 0)
else:
triplet = RGB2XYZ(0, 1, 0, scale=32768)
elif (R, G, B) == (clutres - 1, clutres - 1, 0):
# Map Y -> B
if tagname == "B2A":
triplet = (0, 0, 65535)
else:
triplet = RGB2XYZ(0, 0, 1, scale=32768)
elif (R, G, B) != RGB:
triplet = [0, 0, 0]
else:
if tagname == "B2A":
# White RGB
triplet = [65535] * 3
else:
# White XYZ D50
triplet = get_whitepoint("D50", 32768)
tag.clut[block][B] = triplet
block += 1
tag.clut_writepng(filename[:-3] + tagname + "%i.CLUT.png" % i)
if tagname == "A2B":
tag.clut_writecgats(filename[:-3] + tagname + "%i.CLUT.ti3" % i)
if add_fallback_matrix:
srgb_icc = ICCProfile.from_rgb_space(srgb, "sRGB")
p.tags.rTRC = srgb_icc.tags.rTRC
p.tags.gTRC = srgb_icc.tags.gTRC
p.tags.bTRC = srgb_icc.tags.bTRC
# if False: # NEVER
# # Don't really need this...?
# t = specialpow(1 / 3.0, -2.4)
# for i, v in enumerate(p.tags.gTRC[1:], 1):
# v /= 65535.0
# p.tags.rTRC[i] = p.tags.gTRC[i] = max(convert_range(v, t, 1, 0, 1), 0) * 65535
# p.tags.bTRC[i] = min(convert_range(v, 0, t, 0, 1), 1) * 65535
p.tags.rXYZ = XYZType() # Map red to black
p.tags.gXYZ = XYZType() # Map green to black
p.tags.bXYZ = srgb_icc.tags.wtpt.pcs # Map blue to white
p.calculateID()
p.write(filename)
if __name__ == "__main__":
create_rendering_intent_test_profile(sys.argv[1], add_fallback_matrix=sys.argv[2:3])
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