Apple-2-SW/ii-vision
1
0
Fork 0
mirror of https://github.com/KrisKennaway/ii-vision.git synced 2024-12-21 20:29:21 +00:00
Code Issues Projects Releases Wiki Activity

Map DHGR colours to RGB values (for now using the BMP2DHR default

Browse Source 
NTSC palette), and compute the matrix of pairwise perceptual
differences between these colours, using CIE2000 delta values.
This commit is contained in:
kris 2019-06-12 22:14:11 +01:00
parent cb287ea0e7
commit b33b730bfa
1 changed files with 45 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
transcoder/palette.py Normal file
View File

@ -0,0 +1,45 @@
import colormath.color_objects
import colormath.color_diff
import colormath.color_conversions
import numpy as np
from colours import DHGRColours
def rgb(r, g, b):
return colormath.color_objects.sRGBColor(r, g, b, is_upscaled=True)
# Palette RGB values taken from BMP2DHGR's default NTSC palette
# TODO: support other palettes as well, e.g. //gs RGB
palette = {
DHGRColours.BLACK: rgb(0, 0, 0),
DHGRColours.MAGENTA: rgb(148, 12, 125),
DHGRColours.BROWN: rgb(99, 77, 0),
DHGRColours.ORANGE: rgb(249, 86, 29),
DHGRColours.DARK_GREEN: rgb(51, 111, 0),
DHGRColours.GREY1: rgb(126, 126, 126),
DHGRColours.GREEN: rgb(67, 200, 0),
DHGRColours.YELLOW: rgb(221, 206, 23),
DHGRColours.DARK_BLUE: rgb(32, 54, 212),
DHGRColours.VIOLET: rgb(188, 55, 255),
DHGRColours.GREY2: rgb(126, 126, 126),
DHGRColours.PINK: rgb(255, 129, 236),
DHGRColours.MED_BLUE: rgb(7, 168, 225),
DHGRColours.LIGHT_BLUE: rgb(158, 172, 255),
DHGRColours.AQUA: rgb(93, 248, 133),
DHGRColours.WHITE: rgb(255, 255, 255)
}
# Compute matrix of CIE2000 delta values for this palette, representing
# perceptual distance between colours.
diff_matrix = np.ndarray(shape=(16, 16), dtype=np.int)
for colour1, a in palette.items():
alab = colormath.color_conversions.convert_color(
a, colormath.color_objects.LabColor)
for colour2, b in palette.items():
blab = colormath.color_conversions.convert_color(
b, colormath.color_objects.LabColor)
diff_matrix[colour1.value, colour2.value] = int(
colormath.color_diff.delta_e_cie2000(alab, blab))