编辑“Gallery2:FAQ”（章节）

==Thumbnails / resized images don't get generated properly, how can it be fixed?==
Either you don't get any thumbnails / resized images at all or you get a "broken image" placeholder.
* If you don't have any thumbnails / resized images at all, it means that there's probably no ''image toolkit'' module ''active'' in your G2 installation. G2 needs either the ''imagemagick'', ''netpbm'' or ''GD'' module to be active to generate thumbnails and resized images.
** Please read: [[Gallery:Installing_an_Image_Processing_Library|Installing an Image Processing Library]]
** Note: Imagemagick and netpbm both need an external binary application in addition to the G2 module. If the corresponding G2 module does not autodetect the path to your imagemagick / netpbm binaries, then it's most probably not available on your server. See the above link on how to get the binaries.
** Note: GD is either available in your PHP installation or not. If it works, make sure you have a large PHP memory_limit (> 16 MB), since GD is the only image toolkit in G2 that uses the PHP memory and not system memory. You will get broken thumbnails / resized images with GD unless the PHP memory_limit is large enough.
* If you get broken thumbnails and resized images (e.g. 92x92 pixel resizes), it means image toolkit(s) are active in G2 but they fail to generate thumbnails / resized images successfully. 
** Sometimes the image toolkit modules of Gallery need to be reconfigured (e.g. if your webhost changes something or if you move servers). Uninstall the image toolkit modules (imagemagick, netpbm, gd, ffmeg, jpegtran, dcraw, ...) and then install them again and try to activate them again. Note: Deactivating is not enough. You need to uninstall these modules.
** If you're using GD, then you probably need to [[Gallery:Gallery1:FAQ#Why_do_I_get_the_error_Allowed_memory_size_of_Xxx_bytes_exhausted.3F|increase the PHP memory_limit]] . The best sign that the memory_limit is the problem is if you get normal thumbnails for small images but broken / no thumbnails for large images (large in dimensions / filesize).
** Most often if that happens, one or more image toolkits don't work correctly on your system. Try installing another image tookit module for G2, another toolkit might work.
** If you have multiple image toolkits installed, try disabling all but one of the image toolkit modules. Then add a new image to G2 to check if it works now. If not, deactive this image toolkit and activate another one. Check again, etc. 
** You can also try to just change the image ''site admin'' -> ''toolkit priority'', which is available if more than one image toolkits are active.
** If activated, try to disable the [[Gallery:Gallery2:Modules:squarethumb|Square Thumbnails module]].
** There may be a bug in PHP.  Try adding ''$gallery->setConfig('apacheSetenvBroken', 1);'' to your config.php to disable using the apache_setenv() function
** If everything fails: For netpbm and imagemagick, you can find out why it fails by looking at the debug output. [[Gallery:Gallery2:faq#How_to_set.2Fuse_Gallery_in_debug_mode.3F|Enable buffered debug mode]] and add a new item to G2 and look for "executing"..."Regular output:"..."Error output:"... in the debug output.
* Once it works again, you can generate and fix the broken thumbnails / resized images with ''site admin'' -> ''maintenance'' -> ''Build all thumbnails/resizes''
* URL, "www" problem: If Gallery2 works OK when you navigate to (YourDomain.Ext) but fails with all broken images when you navigate to (www.YourDomain.Ext) then Deactivate AND Uninstall "Url Rewrite" in Admin Panel(Plugins).  This seems to be host-dependent.
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