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使用pil和truetype字体在文本中抖动

dithering python-imaging-library text python

Boris Gorelik · 技术社区 · 15 年前

请考虑以下代码: 从PIL导入图像、图像绘制、图像字体

def addText(img, lTxt):
    FONT_SIZE = 10
    INTERLINE_DISTANCE = FONT_SIZE + 1
    font = ImageFont.truetype('arial.ttf', FONT_SIZE)
    lTxtImageHeight = INTERLINE_DISTANCE * len(lTxt)
    # create text image 
    lTxtImg = Image.new('RGBA', (img.size[1], lTxtImageHeight), 255)
    lTxtImgDraw = ImageDraw.Draw(lTxtImg, )
    for (i, line) in enumerate(lTxt):
      lTxtImgDraw.text((5, i * INTERLINE_DISTANCE), line, font=font, fill='#000000')
    # rotate text image
    lTxtImg = lTxtImg.rotate(90)
    # create new transparent image ret
    ret = Image.new('RGBA', (img.size[0] + lTxtImageHeight, img.size[1]), 255)
    # paste the image to ret
    ret.paste(img, (0,0))
    # paste the text to ret
    ret.paste(lTxtImg, (img.size[0], 0), lTxtImg)
    return ret

img = Image.open('in.png')
addText(img, ['lorem', 'ipsum', 'dolores']).save('out.png')

Here are the input and the output files 这是输入

input http://img16.imageshack.us/img16/8229/73936270.png

这就是输出

output http://img94.imageshack.us/img94/531/outj.png

如您所见,输出图像在文本周围包含大量的微红噪声。如何消除这种抖动?