export_icon.py

from PIL import Image, ImageFont, ImageDraw

def export_icon(icons, icon, size, filename, fontname, color):
    # Initialize font
    fontsize = size
    font = ImageFont.truetype(fontname, fontsize)

    image = Image.new("RGBA", (size, size), color=(0,0,0,0))

    draw = ImageDraw.Draw(image)

    # Determine the dimensions of the icon
    width,height = draw.textsize(icons[icon], font=font)

    fontsize = int(float(size) / float(max(width, height)) * size)

    font = ImageFont.truetype(fontname, fontsize)

    image = Image.new("RGBA", (size, size), color=(0,0,0,0))

    draw = ImageDraw.Draw(image)

    # Determine the dimensions of the icon
    width,height = draw.textsize(icons[icon], font=font)

    draw.text(((size - width) / 2, (size - height) / 2), icons[icon],
            font=font, fill=color)

    # Get bounding box
    bbox = image.getbbox()

    # Create an alpha mask
    imagemask = Image.new("L", (size, size), 0)
    drawmask = ImageDraw.Draw(imagemask)

    # Draw the icon on the mask
    drawmask.text(((size - width) / 2, (size - height) / 2), icons[icon],
        font=font, fill=255)

    # Create a solid color image and apply the mask
    iconimage = Image.new("RGBA", (size,size), color)
    iconimage.putalpha(imagemask)

    if bbox:
        iconimage = iconimage.crop(bbox)

    borderw = int((size - (bbox[2] - bbox[0])) / 2)
    borderh = int((size - (bbox[3] - bbox[1])) / 2)

    # Create output image
    outimage = Image.new("RGBA", (size, size), (0,0,0,0))
    outimage.paste(iconimage, (borderw,borderh))

    # Save file
    outimage.save(filename)