我想在这些坐标内创建一个ciexyy颜色的三角图:(.119,.113),(.162,.723),(.695,.304),如图中所示-亮度y设置为30.0。

我已经创建了一个XY值介于0-1之间的三维数组。

然后我创建了一个矩阵,其中1在三角形内,0在三角形外。

我把三角形矩阵乘以xyy-ndarray。

然后我循环遍历xyy ndarray并将xyy值转换为rgb,并显示它们。

结果有点接近,但不正确。我想在我转换为rgb的最后一部分中会出现错误,但我不确定原因。这是当前图像:

https://imgur.com/a/7cWY0FI

. 任何建议都会非常感谢。

from __future__ import division

import numpy as np

from colormath.color_objects import sRGBColor, xyYColor

from colormath.color_conversions import convert_color

import matplotlib.pyplot as plt

def frange(x,y,jump):

while x < y:

yield x

x += jump

def onSameSide(p1,p2, A,B):

cp1 = np.cross(B-A, p1-A)

cp2 = np.cross(B-A, p2-A)

if(np.dot(cp1, cp2) >= 0):

return True

else:

return False

def isPointInTriangle(p,A,B,C):

if(onSameSide(p,A,B,C) and onSameSide(p,B,A,C) and onSameSide(p,C,A,B)):

return True

else:

return False

xlen = 400

ylen = 400

#CIExyY colour space

#Make an array (1,1,3) with each plane representing how x,y,Y vary in the coordinate space

ciexyY = np.zeros((3,xlen,ylen))

ciexyY[2,:,:]=30.0

for x in frange(0,1,1/xlen):

ciexyY[0,:,int(xlen*x)]=x

for y in frange(0,1,1/xlen):

ciexyY[1,int(ylen*y),:]=y

#coordinates from Viewpixx gamut, scaled up to 100

blue=np.array((.119,.113,30.0))

green=np.array((.162,.723,30.0))

red=np.array((.695,.304,30.0))

#scale up to size of image

blue = np.multiply(blue,xlen)

green = np.multiply(green,xlen)

red = np.multiply(red,xlen)

#make an array of zeros and ones to plot the shape of Viewpixx triangle

triangleZeros = np.zeros((xlen,ylen))

for x in frange(0,xlen,1):

for y in frange(0,ylen,1):

if(isPointInTriangle((x,y,0),blue,green,red)):

triangleZeros[x,y]=1

else:

triangleZeros[x,y]=0

#cieTriangle

cieTriangle = np.multiply(ciexyY,triangleZeros)

#convert cieTriangle xyY to rgb

rgbTriangle = np.zeros((3,xlen,ylen))

for x in frange(0,xlen,1):

for y in range(0,ylen,1):

xyYcolour = xyYColor(cieTriangle[0,x,y],cieTriangle[1,x,y],cieTriangle[2,x,y])

rgbColour = convert_color(xyYcolour,sRGBColor)

rgbTriangle[0,x,y] = rgbColour.rgb_r

rgbTriangle[1,x,y] = rgbColour.rgb_g

rgbTriangle[2,x,y] = rgbColour.rgb_b

rgbTriangle = np.transpose(rgbTriangle)

plt.imshow(rgbTriangle)

plt.show()