Photoshop TIFF
Short summary:
TIFF file format specification supplement (Deflate and JPEG compression CIE L*a*b* and other topics).
Long summary:
Photoshop TIFFPage 1Adobe Photoshop TIFF Technical Notes March 22 2002 Adobe PhotoshopTIFF Technical Notes March 22 2002This document describes the two compression schemes added by the Adobe PhotoshopAdvanced TIFF options dialog when saving TIFF files. The two options are ZIP (Deflate/Inflate) and JPEG. The next two sections give the details of the TIFF file structure when saving with these options. This document also describes the Image Source data tag written by Photoshop under tag number 37724. An update for Lab Images is included at the end of the document. WARNING: TIFF readers that encounter SubIFD (tag number 330) and a bit depth other than 8 should ignore the SubIFDs found in the file. Readers are advised to cross reference terms and discussions found in thisdocument with the TIFF 6.0 specification (TIFF6.pdf) the TIFF Technical Note for Adobe PageMaker6.0 (TIFFPM6.pdf) and the File Formats Specification for Adobe Photoshop(Photoshop File Formats.pdf). of 13 Page 2Adobe Photoshop TIFF Technical Notes March 22 2002 Deflate/Inflate Compression Introduction This section describes TIFF compression scheme 8 lossless Deflate compression using the zlib compressed data format: Field: CompressionTag:259 (103.H) Type: SHORT Count: 1Value: 8 Deflate compression using zlib data formatDeflate is a byteoriented compression scheme which can be applied to a TIFF image regardless of itsPhotometric Interpretation Planar Configuration or image data organization (strips or tiles). Each stripor tile (we will use the term image segment to refer to either) is compressed independently and stored as a complete zlib data stream. Note that the Predictor defined in (TIFF6.pdf Section 14) works well for both Deflate and LZW compression methods. At this time the Deflate compression methods are believed to be free of patent restrictions. ReferenceFor a complete description of the zlib compressed data format see the zlib specification (RFC195 ...
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