PSD
PSD is the native layered raster graphics file format of the Adobe Photoshop program line. The format has gone through multiple versions, each being downwards (but not always upwards) compatible.
PSD is a partially-documented proprietary format. It is very large and complex. Despite this, decoding the primary image of a PSD file is often fairly simple. If an application claims to support PSD, that could mean just about anything.
Images are usually compressed with PackBits, or uncompressed. "Zip" compression, which apparently means zlib, is also supported.
It does not appear to be possible to reliably determine the encoding used by non-Unicode text in a PSD file. A reasonable guess is MacRoman, but other encodings are common.
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See Also
- PSB
- PhotoDeluxe (PDD)
See Photoshop for other related formats.
Identification
PSD files begin with bytes '8' 'B' 'P' 'S' 0x00 0x01.
Specifications
- Adobe Photoshop File Formats Specification (current version)
- Photoshop File Formats Specification V6.0 Release 2
- PHOTOSDK.PDF - Adobe Photoshop 3.0.4 SDK
- ADOBE.TXT - Photoshop 3.0.4 File Format
- PHOTOSHP.TXT - Adobe Photoshop 2.5 File Format
- PSD.rb: Anatomy of a PSD File
Software
Viewers, editors, and converters
Libraries and tools
Sample files
- "Free PSD" websites are abundant. Some examples:
- tombexcavator samples
Links
See also Photoshop#Links.
- Wikipedia: Adobe Photoshop#File format
- Adobe Photoshop website
- Adobe Photoshop File Format Summary, from the Encyclopedia of Graphics File Formats
- Open-Source PSD import code from GIMP
