Quality of podcast images

I have used GB to create several podcasts for my course. When I share them to disk and use Podcast Capture to put them on iTunesU, the images are very fuzzy. The original disk version is excellent when viewed with QuickTime. However, when I use QuickTime Screen Capture and submit the material via Podcast Capture the images look okay.
I ahev ensured that before I share the podcast from GarageBand, that I have selected the best quality for audio and maximum resolution (image size) for the thumbnails.
Does anyone have a suggestion on how to get better image quality to iTunesU?
Thanks
harvey

Hello again
I have managed to change some quality related code responsible for generating different diagram in EPF.
Below you can see that now EPF is generating less compressed jpegs and some anti-aliasing is added to (I purposely disabled it on the text, beacause and you can see in first post there are some issues with some letters).
If you want this in your EPF, I have attached my jar files.
Just move out the originals one (files with name starting e.g. org.eclipse.epf.authoring.ui, but timestamp will be different) from plugins/ to some folder outside eclipse, and put my ones in the plugins folder.
I include MD5 checksums:
e7483d1cc7c290e8eb5001665995165c *org.eclipse.epf.authoring.ui_1.5.0.201409251338.jar
244caf1901fad80e2745411fae6bf380 *org.eclipse.epf.diagram.ui_1.5.0.201409251338.jar
7769795067f8e0afc3cbbd653f762c60 *org.eclipse.epf.library_1.5.0.201409251338.jar

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