使用python编辑jpg中的rgb值 [英] edit rgb values in a jpg with python

问题描述

我正在尝试使用Python Imaging Library更改照片中的RGB值。我一直在使用函数Image.point，它做我想要的，除了我想能够在R G和B值上实现不同的功能。有人知道我怎么做吗？

I am trying to change the RGB values in a photo with the Python Imaging Library. I have been using the function Image.point and it does what I want except I want to be able to implement a different function on the R the G and the B values. Anyone know how I can do this?

谢谢！

推荐答案

除了PIL之外，你最好还是使用 numpy 来计算图像各个波段的数学。

You're better off using numpy in addition to PIL for doing math of the individual bands of an image.

作为一个人为的例子 not 意味着以任何方式表现良好：

As a contrived example that is not meant to look good in any way:

import Image
import numpy as np

im = Image.open('snapshot.jpg')

# In this case, it's a 3-band (red, green, blue) image
# so we'll unpack the bands into 3 separate 2D arrays.
r, g, b = np.array(im).T

# Let's make an alpha (transparency) band based on where blue is < 100
a = np.zeros_like(b)
a[b < 100] = 255

# Random math... This isn't meant to look good...
# Keep in mind that these are unsigned 8-bit integers, and will overflow.
# You may want to convert to floats for some calculations.
r = (b + g) * 5

# Put things back together and save the result...
im = Image.fromarray(np.dstack([item.T for item in (r,g,b,a)]))

im.save('output.png')

输入

输出

这篇关于使用python编辑jpg中的rgb值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！