Peter Figen Offline Upload & Sell: On
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You file size includes all layers, layer information, alpha channels, alpha channels as included in adjustment layers, as well as you base image size. If your base file size is 2.5 gb, and you have more than a couple of layers of any sort, I'd be surprised if your saved file size did not exceed the 4 gb limit for tiff. The limit for psd files is a paltry 2 gb, a limit left over from earlier operating systems. The pixel dimension of tiff is now 300,000 pixels, not 30,000, the latter which was also a legacy figure that I had some personal input with one of Adobe's engineers in convincing him to increase that limit. There is no effective file size limit to .psb files other than the size of your drives and the limits of your patience. .psb files with compression are often smaller than either psd or tiff versions of the same file, but take a long time to save.
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