如何在背景中绘制带有图像的文本

时间:2018-05-11 17:21:43

标签: python python-imaging-library alpha

我想制作类似这个python的东西。 Example Image

我在背景中有图像并用透明填充写文本,以便显示图像。

1 个答案:

答案 0 :(得分:3)

我发现使用Image.composite()函数执行此操作的方法有herehere

@Mark Ransom在问题answerIs it possible to mask an image in Python Imaging Library (PIL)?中(非常)简洁地描述了所使用的方法......以下只是说明如何应用它来实现你想要的做。

from PIL import Image, ImageDraw, ImageFont

BACKGROUND_IMAGE_FILENAME = 'cookie_cutter_background_cropped.png'
RESULT_IMAGE_FILENAME = 'cookie_cutter_text_result.png'
THE_TEXT = 'LOADED'
FONT_NAME = 'arialbd.ttf'  # Arial Bold

# Read the background image and convert to an image with alpha.
with open(BACKGROUND_IMAGE_FILENAME, 'rb') as file:
    bgr_img = Image.open(file)
    bgr_img = bgr_img.convert('RGBA')  # Make sure it has alpha.
    bgr_img_width, bgr_img_height = bgr_img.size
    cx, cy = bgr_img.size[0] // 2, bgr_img.size[1] // 2 # Image center.

# Create a transparent foreground to be result of non-text areas.
fgr_img = Image.new('RGBA', bgr_img.size, color=(0,0,0,0))

# Create a mask layer and render the text string onto it.
font_size = bgr_img_width // len(THE_TEXT)
font = ImageFont.truetype(FONT_NAME, font_size)

txt_width, txt_height = font.getsize(THE_TEXT)
tx, ty = cx - txt_width//2, cy - txt_height//2  # Center text.

mask_img = Image.new('L', bgr_img.size, color=255)
mask_img_draw = ImageDraw.Draw(mask_img)
mask_img_draw.text((tx, ty), THE_TEXT, fill=0, font=font, align='center')

res_img = Image.composite(fgr_img, bgr_img, mask_img)
res_img.save(RESULT_IMAGE_FILENAME)
res_img.show()

其中,使用以下BACKGROUND_IMAGE

background image

生成了下面显示的图像,它在Photoshop中被查看,因此它具有透明背景(不按比例):

result image produced

这是一个放大图,显示了字符的平滑渲染边缘:

magnified section of resulting image