使用枕头从CMYK转换为RGB与Photoshop的转换不同 [英] Conversion from CMYK to RGB with Pillow is different from that of Photoshop

问题描述

我需要在python中将图像从CMYK转换为RGB.我以这种方式使用枕头:

I need to convert an image from CMYK to RGB in python. I used Pillow in this way:

img = Image.open('in.jpg')
img = img.convert('RGB')
img.save('out.jpg')

代码可以正常工作，但是如果我用Photoshop转换相同的图像，则会得到不同的结果，如下所示:-

The code works, but if I convert the same image with Photoshop I have a different result as shown below:-

在photoshop中完成的唯一操作是将方法从CMYK更改为RGB. 为什么两个RGB图像之间存在这种差异?可能是颜色配置文件问题?

The only operation done in photoshop is to change method from CMYK to RGB. Why there is this difference between the two RGB images? It can be a color profile problem?

推荐答案

已解决

问题是Pillow不知道输入的ICC配置文件，而photoshop具有默认设置.

The problem is that Pillow does not know the input ICC profile, while photoshop had one set as default.

Photoshop用于

Photoshop use for

CMYK :美国Web涂层(SWOP)v2

CMYK: U.S. Web Coated (SWOP) v2

RGB :sRGB IEC61966-2.1

RGB: sRGB IEC61966-2.1

所以我已经通过这种方式解决了:

So I've solved in this way:

img = Image.open('in.jpg')
img = ImageCms.profileToProfile(img, 'USWebCoatedSWOP.icc', 'sRGB Color Space Profile.icm', renderingIntent=0, outputMode='RGB')
img.save('out.jpg', quality=100)

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在Windows上，可以在以下文件夹中找到配置文件(如果已安装):

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On Windows the profiles can be found (if installed) in these folders:

C:\Windows\System32\spool\drivers\color\USWebCoatedSWOP.icc
C:\Program Files (x86)\Common Files\Adobe\Color\Profiles\Recommended\USWebCoatedSWOP.icc
C:\Program Files (x86)\Adobe\Acrobat DC\Resource\Color\Profiles\Recommended\USWebCoatedSWOP.icc

C:\Windows\System32\spool\drivers\color\sRGB Color Space Profile.icm
C:\Program Files (x86)\Common Files\Adobe\Color\Profiles\Recommended\sRGB Color Space Profile.icm
C:\Program Files (x86)\Adobe\Acrobat DC\Resource\Color\Profiles\Recommended\sRGB Color Space Profile.icm

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