PIL最佳方式替换颜色？ [英] PIL Best Way To Replace Color?

问题描述

我想从我的图片中删除某种颜色，但它不工作，我希望。我试图做同样的事情，如这里所示使用PIL使所有白色像素透明？然而，图像质量是有点有损，所以它留下一个奇怪的彩色像素周围的地方，什么被删除的小鬼。如果所有三个值都低于100，但是因为图像的质量很差，周围的像素甚至不是黑色的，我尝试像改变像素。

有人知道更好的方式与PIL在Python中替换颜色和周围的任何东西？这可能是我可以想到的完全删除对象的唯一可靠的火，但我不能想到一个方法来做到这一点。

图片有一个白色背景和文本是黑色的。让我们只是说，我想从图像中删除文本，而不留下任何文物。

真的会感谢某人的帮助！感谢

解决方案

您需要将图像表示为二维数组。这意味着要么制作像素列表的列表，要么通过一些聪明的数学将1维数组视为2d。然后，对于每个目标像素，您需要找到所有周围的像素。你可以用一个python生成器这样做：

  def targets（x，y）：
 yield y）＃center 
 yield（x + 1，y）＃Left 
 yield（x-1，y）＃Right 
 yield（x，y + 1）＃Above 
 yield（x，y-1）＃低于
 yield（x + 1，y + 1）＃上面和右边
 yield 
 yield（x-1，y + 1）＃上面和左边
 yield（x-1，y-1）＃左下方
  
 
 
 
所以，你会这样使用：
  for x in range（width）：
 for y in range（height）：
 px = pixels [x] [y] 
 if px [0] == 255 and px [ 1] == 255 and px [2] == 255：
 for i，j in targets（x，y）：
 newpixels [i] [j] = replacementColor 
  
 
I am trying to remove a certain color from my image however it's not working as well as I'd hoped. I tried to do the same thing as seen here Using PIL to make all white pixels transparent? however the image quality is a bit lossy so it leaves a little ghost of odd colored pixels around where what was removed. I tried doing something like change pixel if all three values are below 100 but because the image was poor quality the surrounding pixels weren't even black.

Does anyone know of a better way with PIL in Python to replace a color and anything surrounding it? This is probably the only sure fire way I can think of to remove the objects completely however I can't think of a way to do this.

The picture has a white background and text that is black. Let's just say I want to remove the text entirely from the image without leaving any artifacts behind.

Would really appreciate someone's help! Thanks 
解决方案
You'll need to represent the image as a 2-dimensional array.  This means either making a list of lists of pixels, or viewing the 1-dimensional array as a 2d one with some clever math.  Then, for each pixel that is targeted, you'll need to find all surrounding pixels.  You could do this with a python generator thus:
def targets(x,y):
    yield (x,y) # Center
    yield (x+1,y) # Left
    yield (x-1,y) # Right
    yield (x,y+1) # Above
    yield (x,y-1) # Below
    yield (x+1,y+1) # Above and to the right
    yield (x+1,y-1) # Below and to the right
    yield (x-1,y+1) # Above and to the left
    yield (x-1,y-1) # Below and to the left
So, you would use it like this:
for x in range(width):
    for y in range(height):
        px = pixels[x][y]
        if px[0] == 255 and px[1] == 255 and px[2] == 255:
            for i,j in targets(x,y):
                newpixels[i][j] = replacementColor


                        
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