Large Image Files – PSB vs TIFF

In this post, I am going to explore some basic differences between the various Photoshop file formats: PSD, TIFF and PSB

I’m working on a very large image, and it is a panorama of (42) 10 MP captures, each between 8-10 MBs, merged into Photoshop CS5.1.

Photoshop CS 5.1 can not save anything over 2.0 GBs as a PSD file…

Photoshop CS 5.1 - 2 GB File Size error message
Photoshop CS 5.1 – 2 GB File Size error message

The TIFF file is 3.7 GBs…

File Properties - TIFF
File Properties – TIFF

and the PSB file is 2.7 GBs…

File Properties - PSB
File Properties – PSB

Open Questions

In this example above, there is approximately 1 GB (25%) loss in file size…

Where did it go?

  • File compress?
  • Color Data?
  • File Optimization?

Findings

  • Photoshop PSD (max) file size: 2 GBs
  • Photoshop PSB (max) file size: 4 exabytes (300,000 x 300,000 pixels – 350 x 350 feet)
  • TIFF (max) file size: 4 GBs

Observations

  • Lightroom is not “seeing” my 2.7 GB PSB file, but is “seeing” the 3.7 GB TIFF.

References

anyone got any ideas?

- Andrew
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