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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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By Andrew

A Father, Photographer and Computer Geek living in Chester County (PA).

My Photo Journal of images taken in Chester and Lancaster Counties, including Covered Bridges, Barns, Nature, Fine Art and Events. Images can also be found on VisitPA.com and ExplorePATrails.com.