在Python中将字符串转换为图像 [英] Convert string to image in python

问题描述

一周前，我开始学习python，希望编写一个小型程序将电子邮件转换为图像(.png)，以便可以在论坛上共享它，而不必冒大量垃圾邮件的风险.

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.

似乎python标准库没有包含可以执行此操作的模块，但是我发现它有一个PIL模块(PIL.ImageDraw).

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).

我的问题是我似乎无法正常工作.

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

所以基本上我的问题是:

So basically my questions are:

1. 如何在图像上绘制文本.
2. 如何创建空白(白色)图像
3. 有没有一种方法而无需实际创建文件，以便我可以在保存之前在GUI中显示它?

感谢您的帮助:)

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 = "[e-mail]"

    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")

推荐答案

1. 使用ImageDraw.text-但它不进行任何格式化，只在给定位置打印字符串

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))

找出文字大小:

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

创建图像时，添加带有所需颜色(白色)的附加参数:

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

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

，直到您使用Image.save方法保存图像为止，将没有文件.然后，将其转换为GUI的格式进行显示只是适当的转换.这可以通过将图像编码到内存中的图像文件中来完成:

until you save the image with Image.save method, 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()

或者如果您使用python3:

or if you use 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:

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

raw_img_data = img.tostring()

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