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Recently I've noticed that some thumbnails are now not generating and if I use pthumb snippet on the public site the page will not display. After downloading and re-saving the files using Photoshop save for web and then uploading again they work fine. It seems to me that these files have a color profile or something else in the jpg format that causes the thumbnail generation to fail. The following error shows up over and over in the logs:
[2018-08-31 14:43:28] (ERROR @ /home/folder/core/model/phpthumb/modphpthumb.class.php : 156) Error outputting thumbnail:
OutputThumbnail() failed because !is_resource($this->gdimg_output) in file "phpthumb.class.php" on line 618
We have ImageMagik installed on the system so I don't know why gd would come into play. Has anybody else experienced this? I do not know if it is a server configuration (standard cPanel easyApache PHP packages) or if it is an issue introduced in MODX 2.6.5.
[ed. note: pyrographics last edited this post 6 years, 5 months ago.]
Check permissions on the assets directory as this fixed a similar issue for me. It should be 755.
Is there anything in the error log?
Is it happening on newly uploaded images only?
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Changing the PHP version back from 7.2 to 5.6 causes the thumbnail errors to go away but the installed extensions are the same for both versions.