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
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 Alpha10 Compression N 0 = Deflate/Inflate 11 Filter N 0 = Adaptive 12 Interlace N 0 = Noninterlaced
1 = Adam7 Interlace
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
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
Index Tag Name Writable Values / Notes 0 PixelsPerUnitX N 4 PixelsPerUnitY N 8 PixelUnits N 0 = Unknown
1 = Meter