TYPO3 Core

• resize a 300dpi TIFF image to PNG using stdWrap/cObj
• the 'fileExtension' configuration is not set ($fileArray['ext'] is empty)
• the processed file csm_... has the file extension PNG
• but the file content type is still TIFF, so the file was just renamed, but not converted to PNG

Solution:
Since the processing task determines the accordant filename and file extension, the image processor (ImageMagick, ...) needs to know about that fact as well.