Suppress Warnings From libpng

Description

PNG files exported from some applications, most notably Photoshop, are written with an sRGB profile that libpng sees as invalid. Any attempt to load a file like this using the GD library causes a warning to be written to the PHP error log. It is not possible to suppress this warning.

The following code:

<?php
$image = imagecreatefrompng('clouds.png');

Results in this warning:

Warning: imagecreatefrompng(): gd-png: libpng warning: iCCP: known incorrect sRGB profile

Please see the attached file as an example of one that has the issue.

The only solution I have found so far is to post-process the PNG to remove the sRGB profile. This is not ideal for workflow with large numbers of files. Whilst it is possible to disable all warnings, they are often on in production so this is not a desirable solution.

I would like a method to suppress all libpng warnings. This could be implemented as a gd_ prefixed method that takes an optional bool parameter to toggle warnings on or off. If no parameter is passed it could return the current state.

まず、imagecreatefrompng の背後にある GD の実装と、libpng の警告処理を探します。既存の PHP GD API が画像読み込みの動作をどのように公開しているか、また関連するテストで警告がカバーされているかを確認します。完了条件は、オプションの状態クエリを含め、libpng の警告を切り替えるために要求された方法を提供し、提示された無効なプロファイルのケースをカバーすることです。