Python 更改 PIL 中的像素颜色值
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Changing pixel color value in PIL
提问by Kuppo
I need to change pixel color of an image in python. Except for the pixel value (255, 0, 0) red I need to change every pixel color value into black (0, 0, 0). I tried the following code but it doesn't helped.
我需要在 python 中更改图像的像素颜色。除了像素值 (255, 0, 0) 红色我需要将每个像素颜色值更改为黑色 (0, 0, 0)。我尝试了以下代码，但没有帮助。
from PIL import Image
im = Image.open('A:\ex1.jpg')
for pixel in im.getdata():
if pixel == (255,0,0):
print "Red coloured pixel"
else:
pixel = [0, 0, 0]
回答by magni-
See this wikibook: https://en.wikibooks.org/wiki/Python_Imaging_Library/Editing_Pixels
请参阅此维基书：https: //en.wikibooks.org/wiki/Python_Imaging_Library/Editing_Pixels
Modifying that code to fit your problem:
修改该代码以适应您的问题：
pixels = img.load() # create the pixel map
for i in range(img.size[0]): # for every pixel:
for j in range(img.size[1]):
if pixels[i,j] != (255, 0, 0):
# change to black if not red
pixels[i,j] = (0, 0 ,0)
回答by innuendo
Taking the question to an extreme level, here's how to randomly change the channels in PIL (neglecting any 0, which I consider as background)
将问题带到一个极端的水平，这里是如何随机更改 PIL 中的通道（忽略任何 0，我认为是背景）
rr, gg, bb = in_img.split()
rr = rr.point(lambda p: 0 if p==0 else np.random.randint(256) )
gg = gg.point(lambda p: 0 if p==0 else np.random.randint(256) )
bb = bb.point(lambda p: 0 if p==0 else np.random.randint(256) )
out_img = Image.merge("RGB", (rr, gg, bb))
out_img.getextrema()
out_img.show()
Enjoy!
享受！
回答by Anno
回答by loxaxs
Here is the way I'd use PIL to do what you want:
这是我使用 PIL 做你想做的事情的方式：
from PIL import Image
imagePath = 'A:\ex1.jpg'
newImagePath = 'A:\ex2.jpg'
im = Image.open(imagePath)
def redOrBlack (im):
newimdata = []
redcolor = (255,0,0)
blackcolor = (0,0,0)
for color in im.getdata():
if color == redcolor:
newimdata.append( redcolor )
else:
newimdata.append( blackcolor )
newim = Image.new(im.mode,im.size)
newim.putdata(newimdata)
return newim
redOrBlack(im).save(newImagePath)
