Adobe added large-document features to Adobe Photoshop in the inaugural version of the Creative Suite. The Large Document Format uses the PSB file extension and can accommodate files that measure up to 300,000 pixels in each direction. At 300 dpi, that's a 1,000-inch-square document -- one big file by anyone's standards, and not a document you can create on a system without a lot of memory and scratch disk space. Although you can save files up to 2 GB in size using the PSD file extension, you may need to use the Large Document Format if your document exceeds that size. Even on a fast computer, plan on taking a break while your system saves really big files. Bear in mind that PSB files can't be opened by any version of Photoshop before Photoshop CS.
- Skill level:
- Moderately Easy
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Create a document whose fundamental disk space requirement reaches 2 GB. At 300 dpi in CMYK mode, for example, that's a 77.15-inch-square file or its dimensional equivalent.
Create a document whose fundamental storage requirement -- based on the combination of its dimensions and its colour mode -- is less than 2 GB but that includes enough layers and other elements to reach 2 GB in disk space.
Save your file in TIFF format if it's up to 4 GB in size. Choose PSD format for files up to 2 GB, PDF for files up to 30,000 pixels square and 10 GB, PSB for layered files more than 2 GB and RAW for flattened files of any size. A PSB file can reach up to 4 exabytes, which is 4,000 million gigabytes. In other words, Photoshop can create files larger than it can save on today's storage media.
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