arch-wiki-md-repo/wiki/_content/english/Libpng errors.md

All arch-wiki articles in markdown format, updated every two days.

## Contents

*   [1 Problem](#Problem)
*   [2 Solution](#Solution)
    *   [2.1 GIMP](#GIMP)
    *   [2.2 ImageMagick](#ImageMagick)

## Problem

Some changes in [libpng](https://www.archlinux.org/packages/?name=libpng) version 1.6+ cause it to issue a warning or even not work correctly with the original HP/MS sRGB profile, leading to the following stderr:

```
libpng warning: iCCP: known incorrect sRGB profile

```

The old profile uses a D50 whitepoint, where D65 is standard. This profile is not uncommon, being used by Adobe Photoshop, although it was not embedded into images by default.

## Solution

The simplest solution is simply to remove the embedded profile from your image. This can cause a slight shift in color *IF* you have a properly calibrated system, monitor, and software. If you really need it (say for a print shop), you can alternatively embed a different color profile. If this applies to you, you probably have the profiles you need already.

### GIMP

To remove the embedded profile, go to the menu *Image > Mode > Assign Color Profile* and set it to *RGB workspace(sRGB built-in)*.

To change the embedded profile, go to *Image > Mode > Convert to Color Profile* where you can choose a profile you already have loaded or load a new one from disk.

### ImageMagick

To remove the embedded profile, just run:

```
$ convert -strip *input_filename* *output_filename*

```