Photoshop tags are found in PSD and PSB files, as well as inside embedded Photoshop information in many other file types (JPEG, TIFF, PDF, PNG to name a few).
Many Photoshop tags are marked as Unknown (indicated by a question mark after the tag name) because the information they provide is not very useful under normal circumstances. These unknown tags are not extracted unless the Unknown (-u) option is used. Seehttp://www.adobe.com/devnet-apps/photoshop/fileformatashtml/ for the official specification
Photoshop path tags (Tag ID's 0x7d0 to 0xbb5) are not defined by default, but a config file included in the full ExifTool distribution (config_files/photoshop_paths.config) contains the tag definitions to allow access to this information.
Tag IDTag NameWritableValues / Notes0x03e8Photoshop2Info?no 0x03e9MacintoshPrintInfo?no 0x03eaXMLData?no 0x03ebPhotoshop2ColorTable?no 0x03edResolutionInfo---> Photoshop Resolution Tags0x03eeAlphaChannelsNamesno 0x03efDisplayInfo?no 0x03f0PStringCaption?no 0x03f1BorderInformation?no 0x03f2BackgroundColor?no 0x03f3PrintFlags?no 0x03f4BW_HalftoningInfo?no 0x03f5ColorHalftoningInfo?no 0x03f6DuotoneHalftoningInfo?no 0x03f7BW_TransferFunc?no 0x03f8ColorTransferFuncs?no 0x03f9DuotoneTransferFuncs?no 0x03faDuotoneImageInfo?no 0x03fbEffectiveBW?no 0x03fcObsoletePhotoshopTag1?no 0x03fdEPSOptions?no 0x03feQuickMaskInfo?no 0x03ffObsoletePhotoshopTag2?no 0x0400TargetLayerID?no 0x0401WorkingPath?no 0x0402LayersGroupInfo?no 0x0403ObsoletePhotoshopTag3?no 0x0404IPTCData---> IPTC Tags0x0405RawImageMode?no 0x0406JPEG_Quality---> Photoshop JPEG_Quality Tags0x0408GridGuidesInfo?no 0x0409PhotoshopBGRThumbnailundef!(this is a JPEG image, but in BGR format instead of RGB)0x040aCopyrightFlagint8u0 = False 1 = True0x040bURLstring 0x040cPhotoshopThumbnailundef! 0x040dGlobalAngleint32u 0x040eColorSamplersResource?no 0x040fICC_Profile---> ICC_Profile Tags0x0410Watermark?no 0x0411ICC_Untagged?no 0x0412EffectsVisible?no 0x0413SpotHalftone?no 0x0414IDsBaseValue?no 0x0415UnicodeAlphaNames?no 0x0416IndexedColorTableCount?no 0x0417TransparentIndex?no 0x0419GlobalAltitudeint32u 0x041aSliceInfo---> Photoshop SliceInfo Tags0x041bWorkflowURLno 0x041cJumpToXPEP?no 0x041dAlphaIdentifiers?no 0x041eURL_Listno+ 0x0421VersionInfo---> Photoshop VersionInfo Tags0x0422EXIFInfo---> EXIF Tags0x0423ExifInfo2?no 0x0424XMP---> XMP Tags0x0425IPTCDigeststring!(this tag indicates provides a way for XMP-aware applications to indicate that the XMP is synchronized with the IPTC. When writing, special values of "new" and "old" represent the digests of the IPTC from the edited and original files respectively, and are undefined if the IPTC does not exist in the respective file. Set this to "new" as an indication that the XMP is synchronized with the IPTC)0x0426PrintScaleInfo---> Photoshop PrintScaleInfo Tags0x0428PixelInfo---> Photoshop PixelInfo Tags0x0429LayerComps?no 0x042aAlternateDuotoneColors?no 0x042bAlternateSpotColors?no 0x042dLayerSelectionIDs?no 0x042eHDRToningInfo?no 0x042fPrintInfo?no 0x0430LayerGroupsEnabledID?no 0x0431ColorSamplersResource2?no 0x0432MeasurementScale?no 0x0433TimelineInfo?no 0x0434SheetDisclosure?no 0x0435DisplayInfo?no 0x0436OnionSkins?no 0x0438CountInfo?no 0x043aPrintInfo2?no 0x043bPrintStyle?no 0x043cMacintoshNSPrintInfo?no 0x043dWindowsDEVMODE?no 0x043eAutoSaveFilePath?no 0x043fAutoSaveFormat?no 0x0440PathSelectionState?no 0x0bb7ClippingPathNameno 0x0bb8OriginPathInfo?no 0x1b58ImageReadyVariables?no 0x1b59ImageReadyDataSets?no 0x1f40LightroomWorkflow?no 0x2710PrintFlagsInfo?noThis information is found in the PSD file header.
Index2Tag NameWritableValues / Notes6NumChannelsno 7ImageHeightno 9ImageWidthno 11BitDepthno 12ColorModeno 0 = Bitmap 1 = Grayscale 2 = Indexed 3 = RGB 4 = CMYK 7 = Multichannel 8 = Duotone 9 = LabTags extracted from Photoshop layer information.
Tag IDTag NameWritableValues / Notes'_xbnd'LayerBlendModesno+ 'colr' = Color 'dark' = Darken 'diff' = Difference 'diss' = Dissolve 'div ' = Color Dodge 'dkCl' = Darker Color 'fdiv' = Divide 'fsub' = Subtract 'hLit' = Hard Light 'hMix' = Hard Mix 'hue ' = Hue 'idiv' = Color Burn 'lLit' = Linear Light 'lbrn' = Linear Burn 'lddg' = Linear Dodge 'lgCl' = Lighter Color 'lite' = Lighten 'lum ' = Luminosity 'mul ' = Multiply 'norm' = Normal 'over' = Overlay 'pLit' = Pin Light 'pass' = Pass Through 'sLit' = Soft Light 'sat ' = Saturation 'scrn' = Screen 'smud' = Exclusion 'vLit' = Vivid Light '_xcnt'LayerCountno '_xnam'LayerNamesno+ '_xopc'LayerOpacitiesno+ '_xrct'LayerRectanglesno+ 'luni'LayerUnicodeNamesno+