## PNG Tags

> Tag ID | Tag Name | Writable | Values / Notes
> --- | --- | --- | ---
> 'IHDR' | ImageHeader | - | --> PNG ImageHeader Tags
> 'PLTE' | Palette | N |
> 'bKGD' | BackgroundColor | N |
> 'cHRM' | PrimaryChromaticities | - | --> PNG PrimaryChromaticities Tags
> 'fRAc' | FractalParameters | N |
> 'gAMA' | Gamma | N |
> 'gIFg' | GIFGraphicControlExtension | N |
> 'gIFt' | GIFPlainTextExtension | N |
> 'gIFx' | GIFApplicationExtension | N |
> 'hIST' | PaletteHistogram | N |
> 'iCCP' | ICC_Profile | - | --> ICC_Profile Tags
> 'iTXt' | InternationalText | - | --> PNG TextualData Tags
> 'oFFs' | ImageOffset | N |
> 'pCAL' | PixelCalibration | N |
> 'pHYs' | PhysicalPixel | - | --> PNG PhysicalPixel Tags
> 'sBIT' | SignificantBits | N |
> 'sPLT' | SuggestedPalette | N |
> 'sRGB' | SRGBRendering | N | 0 = Perceptual 1 = Relative Colorimetric 2 = Saturation 3 = Absolute Colorimetric
> 'tEXt' | TextualData | - | --> PNG TextualData Tags
> 'tIME' | ModifyDate | N |
> 'tRNS' | Transparency | N |
> 'tXMP' | XMP | - | --> XMP Tags
> 'zTXt' | CompressedText | - | --> PNG TextualData Tags

## PNG ImageHeader Tags

> Index | Tag Name | Writable | Values / Notes
> --- | --- | --- | ---
> 0 | ImageWidth | N |
> 4 | ImageHeight | N |
> 8 | BitDepth | N |
> 9 | ColorType | N | 0 = Grayscale 2 = RGB 3 = Palette 4 = Grayscale with Alpha 6 = RGB with Alpha
> 10 | Compression | N | 0 = Deflate/Inflate
> 11 | Filter | N | 0 = Adaptive
> 12 | Interlace | N | 0 = Noninterlaced 1 = Adam7 Interlace

## PNG PrimaryChromaticities Tags

> Index | Tag Name | Writable | Values / Notes
> --- | --- | --- | ---
> 0 | WhitePointX | N |
> 1 | WhitePointY | N |
> 2 | RedX | N |
> 3 | RedY | N |
> 4 | GreenX | N |
> 5 | GreenY | N |
> 6 | BlueX | N |
> 7 | BlueY | N |

## PNG TextualData Tags

The PNG TextualData format allows aribrary tag names to be used. Only the standard tag names are listed below, however ExifTool will decode any tags found in the image.

> Tag ID | Tag Name | Writable | Values / Notes
> --- | --- | --- | ---
> 'Author' | Author | N |
> 'Comment' | Comment | N |
> 'Copyright' | Copyright | N |
> 'Creation Time' | CreationTime | N |
> 'Description' | Description | N |
> 'Disclaimer' | Disclaimer | N |
> 'Raw profile type APP1' | APP1_Profile | - | --> EXIF Tags --> XMP Tags
> 'Raw profile type exif' | EXIF_Profile | - | --> EXIF Tags
> 'Raw profile type icc' | ICC_Profile | - | --> ICC_Profile Tags
> 'Raw profile type iptc' | IPTC_Profile | - | --> Photoshop Tags
> 'Raw profile type xmp' | XMP_Profile | - | --> XMP Tags
> 'Software' | Software | N |
> 'Source' | Source | N |
> 'Title' | Title | N |
> 'Warning' | PNGWarning | N |

## PNG PhysicalPixel Tags

> Index | Tag Name | Writable | Values / Notes
> --- | --- | --- | ---
> 0 | PixelsPerUnitX | N |
> 4 | PixelsPerUnitY | N |
> 8 | PixelUnits | N | 0 = Unknown 1 = Meter

<-- ExifTool Tag Names

(This document generated automatically by Image::ExifTool::BuildTagLookup)
Last revised Jul 6, 2005