如何使用 Python 中的 PIL 将一个图像合成到另一个图像上？

我需要采取一个图像，并把它到一个新的，生成的白色背景，以便它转换成一个可下载的桌面壁纸。所以这个过程是这样的:

  1. 生成1440x900尺寸的全白图像
  2. 将现有图像置于顶部，居中
  3. 保存为单个图像

在 PIL 中，我看到了 ImageDraw对象，但是没有任何迹象表明它可以将现有的图像数据绘制到另一个图像上。任何人都可以推荐的建议或链接？

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小开

Image.blend()? [link]

Or, better yet, Image.paste(), same link.

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最佳答案

This can be accomplished with an Image instance's paste method:

from PIL import Image
img = Image.open('/path/to/file', 'r')
img_w, img_h = img.size
background = Image.new('RGBA', (1440, 900), (255, 255, 255, 255))
bg_w, bg_h = background.size
offset = ((bg_w - img_w) // 2, (bg_h - img_h) // 2)
background.paste(img, offset)
background.save('out.png')

This and many other PIL tricks can be picked up at Nadia Alramli's PIL Tutorial

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Maybe too late, but for such image operations, we do use ImageSpecField in model with original image.

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Based on unutbus answer:

#!/usr/bin/env python


from PIL import Image
import math




def resize_canvas(old_image_path="314.jpg", new_image_path="save.jpg",
canvas_width=500, canvas_height=500):
"""
Place one image on another image.


Resize the canvas of old_image_path and store the new image in
new_image_path. Center the image on the new canvas.
"""
im = Image.open(old_image_path)
old_width, old_height = im.size


# Center the image
x1 = int(math.floor((canvas_width - old_width) / 2))
y1 = int(math.floor((canvas_height - old_height) / 2))


mode = im.mode
if len(mode) == 1:  # L, 1
new_background = (255)
if len(mode) == 3:  # RGB
new_background = (255, 255, 255)
if len(mode) == 4:  # RGBA, CMYK
new_background = (255, 255, 255, 255)


newImage = Image.new(mode, (canvas_width, canvas_height), new_background)
newImage.paste(im, (x1, y1, x1 + old_width, y1 + old_height))
newImage.save(new_image_path)


resize_canvas()

Remember to use Pillow (Documentation, GitHub, PyPI) instead of python-imaging as Pillow works with Python 2.X and Python 3.X.

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This is to do something similar

Where I started was by generating that 'white background' in photoshop and exporting it as a PNG file. Thats where I got im1 (Image 1). Then used the paste function cause it's way easier. 

from PIL import Image


im1 = Image.open('image/path/1.png')
im2 = Image.open('image/path/2.png')
area = (40, 1345, 551, 1625)
im1.paste(im2, area)
l>(511+40) l>(280+1345)
|    l> From 0 (move, 1345px down)
-> From 0 (top left, move 40 pixels right)

Okay so where did these #'s come from? (40, 1345, 551, 1625) im2.size (511, 280) Because I added 40 right and 1345 down (40, 1345, 511, 280) I must add them to the original image size which = (40, 1345, 551, 1625)

im1.show()

to show your new image


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