谈到二进制字符串与PIL图像

问题描述

所以，我想要做的是有PIL创建基于二进制串的图像。
一些背景故事：

So, what I'm trying to do is have PIL create an image based on a string of binary.Some backstory:

from PIL import Image

value = "0110100001100101011011000110110001101111"
vdiv = [value[i:i+8] for i in range(0, len(value), 8)]

^此创建从二进制串字节的列表。 ['01101000'，'01100101'，...]

def diff(inp):
    if inp == '1':
        return (0,0,0)
    if inp == '0':
        return (255,255,255)
    else:
        pass

^这将返回各对应位颜色元组，如果我称之为：

^This returns a color tuple for each corresponding bit, and if I call:

for i in vdiv:
    for i2 in i:
        print diff(i2)

这将打印各种颜色元组中列出的每个字节位。 （0,0,0）（0,0,0）（255,255,255）...

我想知道的是，我怎样才能得到PIL要创造一个像素的二进制字符串匹配的图像？

What I want to know is, How can I get PIL to create an image where the pixels match the binary string?

这里是它应该是什么样子：

Here is what it should look like.:

我迄今为PIL什么：

img = Image.new( 'RGB', (8,len(vdiv)), "white")
pixels = img.load()

##
for x in range(img.size[0]):
    for y in range(img.size[1]):
        for i in vdiv:
            for i2 in i:
                pixels[x,y] = diff(i2) #Creates a black image. What do?
##

img.show()

这是在范围X 这让我一下。我迷路了。

It is the for x in range bit that gets me. I am lost.

推荐答案

您可以使用 img.putdata ：

import Image

value = "0110100001100101011011000110110001101111"

cmap = {'0': (255,255,255),
        '1': (0,0,0)}

data = [cmap[letter] for letter in value]
img = Image.new('RGB', (8, len(value)//8), "white")
img.putdata(data)
img.show()

如果您有numpy的，你也可以使用 Image.fromarray ：

If you have NumPy, you could instead use Image.fromarray:

import Image
import numpy as np

value = "0110100001100101011011000110110001101111"

carr = np.array([(255,255,255), (0,0,0)], dtype='uint8')
data = carr[np.array(map(int, list(value)))].reshape(-1, 8, 3)
img = Image.fromarray(data, 'RGB')
img.save('/tmp/out.png', 'PNG')

不过这timeit测试建议使用 putdata 更快：

value = "0110100001100101011011000110110001101111"*10**5

def using_fromarray():
    carr = np.array([(255,255,255), (0,0,0)], dtype='uint8')
    data = carr[np.array(map(int, list(value)))].reshape(-1, 8, 3)
    img = Image.fromarray(data, 'RGB')
    return img

def using_putdata():
    cmap = {'0': (255,255,255),
            '1': (0,0,0)}

    data = [cmap[letter] for letter in value]
    img = Image.new('RGB', (8, len(value)//8), "white")
    img.putdata(data)
    return img

---

In [79]: %timeit using_fromarray()
1 loops, best of 3: 1.67 s per loop

In [80]: %timeit using_putdata()
1 loops, best of 3: 632 ms per loop

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