PNG Tags

Tag IDTag Name WritableValues / Notes
'IHDR' ImageHeader - --> PNG ImageHeader Tags
'cHRM' PrimaryChromaticities - --> PNG PrimaryChromaticities Tags
'gAMA' Gamma N  
'iCCP' ICC_Profile - --> ICC_Profile Tags
'iTXt' InternationalText - --> PNG TextualData Tags
'pHYs' PhysicalPixel - --> PNG PhysicalPixel Tags
'sRGB' SRGBRendering N 0 = sRGB Perceptual
1 = sRGB Relative Colorimetric
2 = sRGB Saturation
3 = sRGB Absolute Colorimetric
'tEXt' TextualData - --> PNG TextualData Tags
'tIME' ModifyDate N  
'zTXt' CompressedText - --> PNG TextualData Tags

PNG ImageHeader Tags

IndexTag Name WritableValues / 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 = No
1 = Adam7 Interlace

PNG PrimaryChromaticities Tags

IndexTag Name WritableValues / 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 IDTag Name WritableValues / Notes
'Author' Author N  
'Comment' Comment N  
'Copyright' Copyright N  
'Creation Time' CreationTime N  
'Description' Description N  
'Disclaimer' Disclaimer N  
'Raw profile type APP1' RawProfileTypeAPP1 - --> EXIF Tags
--> XMP Tags
'Raw profile type exif' RawProfileTypeEXIF - --> EXIF Tags
'Raw profile type icc' RawProfileTypeICC - --> ICC_Profile Tags
'Raw profile type iptc' RawProfileTypeIPTC - --> Photoshop Tags
'Raw profile type xmp' RawProfileTypeXMP - --> XMP Tags
'Software' Software N  
'Source' Source N  
'Title' Title N  

PNG PhysicalPixel Tags

IndexTag Name WritableValues / Notes
0 PixelsPerUnitX N  
4 PixelsPerUnitY N  
8 PixelUnits N 1 = meter

<-- ExifTool Tag Names


(This document generated automatically by Image::ExifTool::BuildTagLookup)
Last revised Jun 15, 2005