Using Ubuntu 12.04 LTS Release. I installed Epson Image Scan! and apparently there's a known problem that doesn't allow saving scans as jpeg unless a lib is installed. I quote the FAQ:
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Image Scan! for Linux: I cannot save to JPEG
FAQ ID : LS00001 Created : 2009.10.30 Last modified : 2011.10.13
Saving to JPEG is disabled when a compatible version of the JPEG library is not detected on your system. Please install libjpeg version 6 in order to restore the ability to save to JPEG.
We have confirmed that this problem occurs in the following distributions:
Mandriva Linux 2010 Mandriva Linux 2010.1 Mandriva Linux 2011 openSUSE 11.3 Ubuntu 12.04
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I've been searching the web and forums for a clue where to find this lib and how to install it without luck. I've found and installed libjpeg-turbo (8, I believe) but this didn't enable the jpeg file format in the app; it stays greyed out.