Our images are growing fat — so fat that the software we like to work with isn't able to cope with their file sizes. But along comes Sean Bagshaw with a great tutorial on how you can save files that exceed 4 GB in Photoshop that still retain editing capabilities in Lightroom and Bridge.
With our images growing larger and larger as both sensor resolutions and the number of Photoshop layers increase, there's an understandable need to be able to save them without the downside of big Photoshop (PSB) files. PSB files can't be previewed in Lightroom or Bridge, nor can they be edited in Lightroom's Develop module or prepared for print in its Print module. Personally, I've always used PSD files to save my work, which are put into a folder that Lightroom watches. Upon synchronizing this folder, Lightroom then shows a thumbnail of that image while I often add a couple more adjustments to finish the photo.
PSD files have a maximum allowed file size of 2 GB. Most of the time though, I take a look at the bottom left of Photoshop's workspace and see that the file size sits around 1.5 GB. With TIFF files, it wouldn't be much better. They do support 4 GB file sizes on paper, but in the long run, that will not be enough either. Camera manufacturers release higher sensor resolutions all the time, and with just a couple of layers, you could be looking at files that exceed that 4 GB mark as well.
So, we are left with the PSB file format. Sean Bagshaw picked up this neat trick on the web that retains the viewing and editing capabilities of PSB files as if they were PSDs or TIFFs. What's more is that he made a great video about it.