INTRODUCTION:
Hello - I am new to TYPO3 and very excited about its feature rich capabilities.
. .
I would like to share a recent discovery regarding resolution of a "PDF Thumbnail
Generation Problem" in a shared hosting environment when using the TYPO3 file upload
feature.
PROBLEM:
When PDF files are uploaded using the TYPO3 file upload feature, default duplicate error
thumbnails were created with the "Thumbnail Not Generated!" error.
IMPACT:
The "PDF Thumbnail Generation Problem" may impact users where "All" PDF files are
affected or where only "some" PDF files are affected.
SOLUTION:
The solution is to determine the root cause and implementation of the following:
1) Run PHP test script to determine the hosting environment and configuration
related to the image processing applications that perform thumbnail conversion.
2) Run PHP test script to test the PDF thumbnail "convert" function separate
from the TYPO3 system using a standards compliant PDF test file with instructions.
3) Make required changes and re-test the TYPO file upload feature
DETAILS:
Any of the following issues could be the potential cause of the problem:
- Improper server installation or versions of ImageMagick and GhostScript
(IM-GS)
- Older versions of ImageMagick and GhostScript (IM-GS) on the server
- Incorrect ImageMagick path configuration setting in TYPO3
- Incorrect or unknown hosting account absolute path in program coding
- Corrupted, encrypted, or compressed PDF files.
- Compatibility of GhostScript with recent versions of PDF files
To help isolate the "PDF Thumbnail Generation Problem", Smargasy, Inc. >smargasy.com/<, a
TYPO3 Certified Integrator, helped provide some coding to run PHP test scripts. The PHP test scripts were
created to determine the hosting environment configuration and then that information was used for creating a
test script to directly run the server image processing software (ImageMagick and GhostScript) without using
TYPO3. A very important "standards compliant" PDF test file was created as the source file for
conversion testing using the created conversion scripts. The standards compliant PDF test file
(Smargasy_PDF-Thumbnail-Compatibility-Test-File.pdf" is also the detailed instructions for performing the
testing. The test file and instructions are free for distribution and the direct download link (Hosted by
Smargasy, Inc.) is:
smargasy.com/fileadmin/media_data/community/Smargasy_PDF-Thumbnail-Compatibility-Test-File.pdf<
Although others may have thumbnail generation problems that are slightly
different, the PDF test file is a great starting point and would have saved me
many hours of troubleshooting.
Best Regards,
Mike Brice
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