Index: typo3/sysext/cms/tslib/class.tslib_content.php
===================================================================
--- typo3/sysext/cms/tslib/class.tslib_content.php	(revision 6485)
+++ typo3/sysext/cms/tslib/class.tslib_content.php	(working copy)
@@ -5343,7 +5343,11 @@
 							$gifCreator->init();
 
 							if ($GLOBALS['TSFE']->config['config']['meaningfulTempFilePrefix'])	{
-								$gifCreator->filenamePrefix = $GLOBALS['TSFE']->fileNameASCIIPrefix(preg_replace('/\.[[:alnum:]]+$/','',basename($theImage)),intval($GLOBALS['TSFE']->config['config']['meaningfulTempFilePrefix']),'_');
+								$filename = basename($theImage);
+									// remove extension
+								$filename = substr($filename, 0, strrpos($filename, '.'));
+								$gifCreator->filenamePrefix = substr($filename, 0, intval($GLOBALS['TSFE']->config['config']['meaningfulTempFilePrefix']));
+								unset($filename);
 							}
 
 							if ($fileArray['sample'])	{
Index: typo3/sysext/cms/tslib/class.tslib_gifbuilder.php
===================================================================
--- typo3/sysext/cms/tslib/class.tslib_gifbuilder.php	(revision 6485)
+++ typo3/sysext/cms/tslib/class.tslib_gifbuilder.php	(working copy)
@@ -626,10 +626,17 @@
 	 */
 	function fileName($pre)	{
 
+		$meaningfulPrefix = '';
+
+		if ($GLOBALS['TSFE']->config['config']['meaningfulTempFilePrefix']) {
+			$meaningfulPrefix = implode('_', array_merge($this->combinedTextStrings, $this->combinedFileNames));
+			$meaningfulPrefix = substr($meaningfulPrefix, 0, intval($GLOBALS['TSFE']->config['config']['meaningfulTempFilePrefix']));
+		}
+
 			// WARNING: In PHP5 I discovered that rendering with freetype of Japanese letters was totally corrupt. Not only the wrong glyphs are printed but also some memory stack overflow resulted in strange additional chars - and finally the reason for this investigation: The Bounding box data was changing all the time resulting in new images being generated all the time. With PHP4 it works fine.
 		return $this->tempPath.
 				$pre.
-				($GLOBALS['TSFE']->config['config']['meaningfulTempFilePrefix'] ? $GLOBALS['TSFE']->fileNameASCIIPrefix(implode('_',array_merge($this->combinedTextStrings,$this->combinedFileNames)),intval($GLOBALS['TSFE']->config['config']['meaningfulTempFilePrefix']),'_') : '').
+				$meaningfulPrefix .
 				t3lib_div::shortMD5(serialize($this->setup)).
 				'.'.$this->extension();
 	}