What means 'PhotoJPEG' and '3:1 compression'?

Hi
What means 'PhotoJPEG' and '3:1 compression'?
I'm afraid it's not a variant of H.264...?
If not, how can I export my 1080p clips to this format according to
http://www.istockphoto.com/help/sell-stock/training-manuals/video/final-clip-sub missions:
Your full-resolution files should be in Quicktime format, compressed with PHOTO JPEG (if file is rendered as a progressive scan) [...] with 3:1 compression. Compression should be set to no less than 95%, "High", or "Best". [...] See the Digital Video Requirements section for more full-resolution file requirements.
Many thanks!
(Sorry I got no reply to my other thread so I thought I better rephrase my problem.)

Photo-Jpeg/MJPEJ-A/MJPEG-B are just video codecs, just like h.264, Apple ProRes or DVCPRO. Regarding 3:1 compression, you can just ignore that (for now).
Both Quicktime 7 Pro and Apple Compressor allow you to EXPORT video as an .MOV with PHOTO-JPEG as the video codec.
Click on the following links to be directed to other discussion threads with a similar request as yours...
     https://discussions.apple.com/thread/2421037?start=0&tstart=0
     https://discussions.apple.com/thread/3272088?start=0&tstart=0
     https://discussions.apple.com/thread/2256657?start=0&tstart=0
Visual example, not a step-by-step (taken from Quicktime 7 Pro)...

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