4-12 颜色映射

我们通过查找表查找一组新的RGB。用新的RGB来代替原来像素值的过程。如果大家不想做表的话可以用一些简单的公式来进行颜色映射。用公式的方法可能无法表达一些更为复杂的效果。因为颜色效果越复杂，那么利用公式进行拟合的时候难度就越大，甚至拟合之后的计算量要远远超过查找表。

import cv2
import numpy as np
img = cv2.imread('image2.jpg',1)
cv2.imshow('src',img)
imgInfo = img.shape
height = imgInfo[0]
width = imgInfo[1]
#rgb -》RGB new "蓝色"
# b = b*1.5
# g = g*1.3
dst = np.zeros((height,width,3),np.uint8)
for i in range(0,height):
    for j in range(0,width):
        (b,g,r) = img[i,j]
        b = b*1.5
        g = g*1.3
        if b>255:
            b = 255
        if g>255:
            g =255
        dst[i,j] = (b,g,r)
cv2.imshow('dst',dst)
cv2.waitKey(0)

import cv2
import numpy as np
img = cv2.imread('image1.jpg',1)
cv2.imshow('src',img)
imgInfo = img.shape
height = imgInfo[0]
width = imgInfo[1]
#rgb -》RGB new "蓝色"
# b = b*1.5
# g = g*1.3
dst = np.zeros((height,width,3),np.uint8)
for i in range(0,height):
    for j in range(0,width):
        (b,g,r) = img[i,j]
        b = b*1.5
        g = g*1.3
        if b>255:
            b = 255
        if g>255:
            g =255
        dst[i,j] = (b,g,r)
cv2.imshow('dst',dst)
cv2.waitKey(0)