PSB files are Adobe’s answer to the 2GB file size limit of PSD files, the standard Photoshop Document, and something which most photographers will likely never have to deal with, but the big issue that plagues them can also apply to large or complex PSD files, too.
PSB files are something I only ever have to worry about myself when I’m making 100MP+ medium format film scans, but for professional retouchers, a 2GB document can be hit really quickly, and regularly. One thing that’s bothered many of them for a long time is how long it takes to compress and save out those huge files.
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