使用PIL绘制不裁剪的文本图像

Question

我想用PIL这个库来画一些文字。但是我遇到的问题是，运行程序后我需要再裁剪一下文字的图片。我只需要文字部分，不要边框。有没有人能给我建议？谢谢！这是我的代码：

import Image, ImageDraw, ImageFont
def draw (text,  size,  color) :
    fontPath = '/home/FreeSansBold.ttf'
    font = ImageFont.truetype(fontPath, size)
    size2 = font.getsize(text)
    im = Image.new('RGBA', size2, (0, 0, 0, 0))
    draw = ImageDraw.Draw(im)
    draw.text((0, 0), text, font=font, fill=color)
    im.save(text +'.png')

drawA = draw('A', 200,  'green')
drawC = draw('C', 200,  'blue')
drawG = draw('G', 200,  'yellow')
drawT = draw('T', 200,  'red')

Answer 1

你能解释一下你说的“没有边框”是什么意思吗？你是想让文字紧贴着图片的边缘吗？如果是这样的话，下面的代码应该可以做到：

import Image, ImageDraw, ImageFont

def draw (text,  size,  color) :
    fontPath = '/home/FreeSansBold.ttf'
    font = ImageFont.truetype(fontPath, size)
    size2 = font.getsize(text)    
    im = Image.new('RGBA', size2, (0, 0, 0, 0))
    draw = ImageDraw.Draw(im)
    draw.text((0, 0), text, font=font, fill=color)

    pixels = im.load()
    width, height = im.size
    max_x = max_y = 0
    min_y = height
    min_x = width

    # find the corners that bound the letter by looking for
    # non-transparent pixels
    transparent = (0, 0, 0, 0)
    for x in xrange(width):
        for y in xrange(height):
            p = pixels[x,y]
            if p != transparent:
                min_x = min(x, min_x)
                min_y = min(y, min_y)
                max_x = max(x, max_x)
                max_y = max(y, max_y)
    cropped = im.crop((min_x, min_y, max_x, max_y))
    cropped.save(text +'.png')

drawA = draw('A', 200,  'green')
drawC = draw('C', 200,  'blue')
drawG = draw('G', 200,  'yellow')
drawT = draw('T', 200,  'red')

这样会生成一张像这样的图片（我把透明的像素填成红色，以便更好地显示图片的边界：http://img43.imageshack.us/img43/3066/awithbg.png）