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Opening and re saving a png image changes the color of the image

See original GitHub issue

Prerequisites

I have written a descriptive issue title
I have verified that I am using the latest version of Magick.NET
I have searched open and closed issues to ensure it has not already been reported

Description

When I open a png image and save it to a new location it changes color: Magick color change As far as I have gathered it is only happening with pngs. They look the same if I open them with photoshop, but the colors are wrong in Windows and Chrome.

Steps to Reproduce

using (var image = new MagickImage(originalPath)) { image.Write(newPath); }

System Configuration

Magick.NET version: Magick.NET-Q16-AnyCPU_7.11.1
Environment (Operating system, version and so on): Windows 10
Additional information: .net core

Issue Analytics

State:
Created 4 years ago
Comments:10 (2 by maintainers)

Top GitHub Comments

1reaction

urban-warriorcommented, Mar 29, 2019

It appears our PNG coder maintainer, who is no longer with us, wanted to identify linear RGB images so that ImageMagick can support both linear (RGB) and non-linear (sRGB) images in the PNG format. The test appears to be incorrect. A patch to fix it is in GIT master branch @ https://github.com/ImageMagick/ImageMagick. The patch will be available in the beta releases of ImageMagick @ https://www.imagemagick.org/download/beta/ by sometime tomorrow.

0reactions

Unavicommented, Mar 26, 2019

Magick Should have used 0.50994 for gamma.