在python中将字符串转换为图像

Convert string to image in python

提问by Marco-

I started to learn python a week ago and want to write a small programm that converts a email to a image (.png) so that it can be shared on forums without risking to get lots of spam mails.

一周前我开始学习 python，想编写一个小程序，将电子邮件转换为图像 (.png)，以便它可以在论坛上共享，而不会冒收到大量垃圾邮件的风险。

It seems like the python standard libary doesn't contain a module that can do that but i`ve found out that there's a PIL module for it (PIL.ImageDraw).

似乎python标准库不包含可以做到这一点的模块，但我发现它有一个PIL模块（PIL.ImageDraw）。

My problem is that i can't seem to get it working.

我的问题是我似乎无法让它工作。

So basically my questions are:

所以基本上我的问题是：

1. How to draw a text onto a image.
2. How to create a blank (white) image
3. Is there a way to do this without actually creating a file so that i can show it in a GUI before saving it?

1. 如何在图像上绘制文本。
2. 如何创建空白（白色）图像
3. 有没有办法在不实际创建文件的情况下做到这一点，以便我可以在保存之前在 GUI 中显示它？

Thanks for your help :)

谢谢你的帮助 ：）

Current Code:

当前代码：

import Image
import ImageDraw
import ImageFont

def getSize(txt, font):
    testImg = Image.new('RGB', (1, 1))
    testDraw = ImageDraw.Draw(testImg)
    return testDraw.textsize(txt, font)

if __name__ == '__main__':

    fontname = "Arial.ttf"
    fontsize = 11   
    text = "[email protected]"

    colorText = "black"
    colorOutline = "red"
    colorBackground = "white"


    font = ImageFont.truetype(fontname, fontsize)
    width, height = getSize(text, font)
    img = Image.new('RGB', (width+4, height+4), colorBackground)
    d = ImageDraw.Draw(img)
    d.text((2, height/2), text, fill=colorText, font=font)
    d.rectangle((0, 0, width+3, height+3), outline=colorOutline)

    img.save("D:/image.png")

采纳答案by Jan Spurny

1. use ImageDraw.text- but it doesn't do any formating, it just prints string at the given location

   img = Image.new('RGB', (200, 100))
   d = ImageDraw.Draw(img)
   d.text((20, 20), 'Hello', fill=(255, 0, 0))
   

   to find out the text size:

   text_width, text_height = d.textsize('Hello')
   

2. When creating image, add an aditional argument with the required color (white):

   img = Image.new('RGB', (200, 100), (255, 255, 255))
   

3. until you save the image with Image.savemethod, there would be no file. Then it's only a matter of a proper transformation to put it into your GUI's format for display. This can be done by encoding the image into an in-memory image file:

   import cStringIO
   s = cStringIO.StringIO()
   img.save(s, 'png')
   in_memory_file = s.getvalue()
   

   or if you use python3:

   import io
   s = io.BytesIO()
   img.save(s, 'png')
   in_memory_file = s.getvalue()
   

   this can be then send to GUI. Or you can send direct raw bitmap data:

   raw_img_data = img.tostring()
   

1. 使用ImageDraw.text- 但它不做任何格式化，它只是在给定的位置打印字符串

   img = Image.new('RGB', (200, 100))
   d = ImageDraw.Draw(img)
   d.text((20, 20), 'Hello', fill=(255, 0, 0))
   

   找出文字大小：

   text_width, text_height = d.textsize('Hello')
   

2. 创建图像时，添加具有所需颜色（白色）的附加参数：

   img = Image.new('RGB', (200, 100), (255, 255, 255))
   

3. 直到你用Image.save方法保存图像，才会有文件。然后，只需进行适当的转换即可将其放入您的 GUI 格式中进行显示。这可以通过将图像编码到内存中的图像文件来完成：

   import cStringIO
   s = cStringIO.StringIO()
   img.save(s, 'png')
   in_memory_file = s.getvalue()
   

   或者如果您使用 python3：

   import io
   s = io.BytesIO()
   img.save(s, 'png')
   in_memory_file = s.getvalue()
   

   然后可以将其发送到 GUI。或者您可以直接发送原始位图数据：

   raw_img_data = img.tostring()
   

回答by Uwe_98

The first 3 lines are not complete, when I'm not wrong. The correct code would be:

前 3 行不完整，当我没有错的时候。正确的代码是：

from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont