一些背景信息:

libpng 1.6+版本中的一些更改导致它发出警告或 甚至不能与原始HP/MS sRGB配置文件正确工作，领先 到以下stderr: libpng警告:iCCP:已知错误的sRGB 旧的配置文件使用D50白点，其中D65是标准的。 这个配置文件并不少见，虽然Adobe Photoshop正在使用 默认情况下，它没有嵌入到图像中。

(来源:https://wiki.archlinux.org/index.php/Libpng_errors)

Error detection in some chunks has improved; in particular the iCCP chunk reader now does pretty complete validation of the basic format. Some bad profiles that were previously accepted are now rejected, in particular the very old broken Microsoft/HP sRGB profile. The PNG spec requirement that only grayscale profiles may appear in images with color type 0 or 4 and that even if the image only contains gray pixels, only RGB profiles may appear in images with color type 2, 3, or 6, is now enforced. The sRGB chunk is allowed to appear in images with any color type.

(来源:https://forum.qt.io/topic/58638/solved-libpng-warning-iccp-known-incorrect-srgb-profile-drive-me-nuts/16)

在Windows中使用IrfanView图像查看器，我简单地重新保存了PNG图像，这纠正了问题。

在Mac OS和Homebrew上有一个更简单的方法来修复这个问题:

如果还没有安装，请安装自制软件

$brew install libpng
$pngfix --strip=color --out=file2.png file.png

或者对当前目录中的每个文件都这样做:

mkdir tmp; for f in ./*.png; do pngfix --strip=color --out=tmp/"$f" "$f"; done

它将为当前目录中的每个png文件创建一个固定副本，并将其放在tmp子目录中。之后，如果一切正常，您只需要重写原始文件。

Another tip is to use the Keynote and Preview applications to create the icons. I draw them using Keynote, in the size of about 120x120 pixels, over a slide with a white background (the option to make polygons editable is great!). Before exporting to Preview, I draw a rectangle around the icon (without any fill or shadow, just the outline, with the size of about 135x135) and copy everything to the clipboard. After that, you just need to open it with the Preview tool using "New from Clipboard", select a 128x128 pixels area around the icon, copy, use "New from Clipboard" again, and export it to PNG. You won't need to run the pngfix tool.

你也可以在photoshop中修复这个…

打开你的。png文件。 文件->另存为并在打开的对话框中取消选中“ICC配置文件:sRGB IEC61966-2.1” 取消勾选“作为副本”。 勇敢地保存你原来的。png文件。 继续你的生活，知道你已经从这个世界上除掉了那么一点点邪恶。

扩展friederbluemle解决方案，下载pngcrush，然后如果你在多个png文件上运行它，就像这样使用代码

path =r"C:\\project\\project\\images" # path to all .png images
import os

png_files =[]

for dirpath, subdirs, files in os.walk(path):
    for x in files:
        if x.endswith(".png"):
            png_files.append(os.path.join(dirpath, x))

file =r'C:\\Users\\user\\Downloads\\pngcrush_1_8_9_w64.exe' #pngcrush file 


for name in png_files:
    cmd = r'{} -ow -rem allb -reduce {}'.format(file,name)
    os.system(cmd)

这里所有与项目相关的PNG文件都在一个文件夹中。

在尝试了本页上的几个建议后，我最终使用了pngcrush解决方案。您可以使用下面的bash脚本递归地检测和修复错误的png配置文件。只需要将完整路径传递给你想要搜索png文件的目录。

fixpng "/path/to/png/folder"

脚本:

#!/bin/bash

FILES=$(find "$1" -type f -iname '*.png')

FIXED=0
for f in $FILES; do
    WARN=$(pngcrush -n -warn "$f" 2>&1)
    if [[ "$WARN" == *"PCS illuminant is not D50"* ]] || [[ "$WARN" == *"known incorrect sRGB profile"* ]]; then
        pngcrush -s -ow -rem allb -reduce "$f"
        FIXED=$((FIXED + 1))
    fi
done

echo "$FIXED errors fixed"