使用Python中的PIL或OpenCV将图像以不透明性更改的两个给定坐标粘贴到另一个图像 [英] Paste an image to another image at two given co-ordinates with altered opacity using PIL or OpenCV in Python

问题描述

我有两张具有给定点的图像，每张图像一个点，需要对齐，以便结果图像是两个图像的总和，而图像2则以40％的不透明度粘贴到图像1上.我已经接受了这个

图片2:

最终结果(所需输出):

为此，我尝试了PIL的 img.paste()函数，并替换了cv2中的numpy图片数组中的值，两者都给出了远非期望的结果.

解决方案

我使用 ImageMagick 制作了两个输入图像，如下所示:

  magick -size 300x400 xc:``rgb(1,204,255)''-填充红色-绘制点280,250"；1.pngmagick-尺寸250x80 xc:"rgb(150,203,0)"-填充红色-绘制点12,25"；2.png 

然后运行以下代码:

 #！/usr/bin/env python3"将一个图像粘贴到另一个图像上，以使每个图像中的给定点重合."从PIL导入图像#打开图像并确保RGBim1 = Image.open('1.png').convert('RGB')im2 = Image.open('2.png').convert('RGB')每个图像中点的#x，y坐标p1x，p1y = 280，250p2x，p2y = 12，25#算出我们需要在新图像的公共点左，右，上，下多少像素的空间pL =最大值(p1x，p2x)pR =最大值(im1.width-p1x，im2.width-p2x)pT =最大值(p1y，p2y)pB = max(im1.height-p1y，im2.height-p2y)#创建纯白色背景bg = Image.new('RGB'，(pL + pR，pT + pB)，'white')bg.save('DEBUG-bg.png')#将im1粘贴到背景上bg.paste(im1，(pL-p1x，pT-p1y))bg.save('DEBUG-bg + im1.png')#为im2制作40％不透明的蒙版alpha = Image.new('L'，(im2.width，im2.height)，int(40 * 255/100))alpha.save('DEBUG-alpha.png')#将im2粘贴到带有Alpha的背景上bg.paste(im2，(pL-p2x，pT-p2y)，alpha)bg.save('result.png') 

结果是这样的:

使用以"DEBUG-xxx.png" 开头的名称保存图像的行仅是为了易于调试，可以将其删除.我可以轻松查看所有内容以查看代码的状态，也可以通过删除"DEBUG * png" 轻松删除所有内容.

I have two images with given points, one point each image, that need to be aligned so that the result image is a summation of both images, while image 2 is pasted on image 1 with 40% opacity. I have taken this question into consideration but our case does not exactly match as the image co-ordinate is supplied by user and images can have wide range of sizes.

Image 1:

Image2:

Final result(desired output):

For this I have tried img.paste() function of PIL and replacing values in numpy array of images in cv2, both giving results that are far from desired.

解决方案

I made two input images with ImageMagick like this:

magick -size 300x400 xc:"rgb(1,204,255)" -fill red -draw "point 280,250" 1.png
magick -size 250x80  xc:"rgb(150,203,0)" -fill red -draw "point 12,25"   2.png

Then ran the following code:

#!/usr/bin/env python3
"""
Paste one image on top of another such that given points in each are coincident.
"""

from PIL import Image

# Open images and ensure RGB
im1 = Image.open('1.png').convert('RGB')
im2 = Image.open('2.png').convert('RGB')

# x,y coordinates of point in each image
p1x, p1y = 280, 250
p2x, p2y = 12, 25

# Work out how many pixels of space we need left, right, above, below common point in new image
pL = max(p1x, p2x)
pR = max(im1.width-p1x,  im2.width-p2x)
pT = max(p1y, p2y)
pB = max(im1.height-p1y, im2.height-p2y)

# Create background in solid white
bg = Image.new('RGB', (pL+pR, pT+pB),'white')
bg.save('DEBUG-bg.png')

# Paste im1 onto background
bg.paste(im1, (pL-p1x, pT-p1y))
bg.save('DEBUG-bg+im1.png')

# Make 40% opacity mask for im2
alpha = Image.new('L', (im2.width,im2.height), int(40*255/100))
alpha.save('DEBUG-alpha.png')

# Paste im2 over background with alpha
bg.paste(im2, (pL-p2x, pT-p2y), alpha)
bg.save('result.png')

The result is this:

The lines that save images with names starting "DEBUG-xxx.png" are just for easy debugging and can be removed. I can easily view them all to see what is going on with the code and I can easily delete them all by removing "DEBUG*png".

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