\defgroup png PNG - Portable Network Graphic Format
* \section Description
*
* \par
* Access to the PNG file format uses libpng version 1.6.23. \n
* http://www.libpng.org \n
* Copyright (c) 2000-2002, 2004, 2006-2015 Glenn Randers-Pehrson
*
* \section Features
*
\verbatim
Data Types: Byte and UShort
Color Spaces: Gray, RGB, MAP and Binary
Compressions:
DEFLATE - LZ77 variation (ZIP) default
Only one image.
Can have an alpha channel.
Internally the components are always packed.
Internally the lines are arranged from top down to bottom.
Handle(1) returns png_structp libPNG structure.
Attributes:
ZIPQuality IM_INT (1) [1-9, default 6] (write only)
ResolutionUnit (string) ["DPC", "DPI"]
XResolution, YResolution IM_FLOAT (1)
Interlaced (same as Progressive) IM_INT (1 | 0) default 0
Gamma IM_FLOAT (1)
WhitePoint IMFLOAT (2)
PrimaryChromaticities IMFLOAT (6)
XPosition, YPosition IM_FLOAT (1)
sRGBIntent IM_INT (1) [0: Perceptual, 1: Relative colorimetric, 2: Saturation, 3: Absolute colorimetric]
TransparencyMap IM_BYTE (N) (for MAP images is the alpha value of the corresponding palette index)
TransparencyIndex IM_BYTE (1) (for MAP images is the first index that has minimum alpha in TransparencyMap, for GRAY images is the index that it is fully transparent)
TransparencyColor IM_BYTE (3) (for RGB images is the color that is full transparent)
CalibrationName, CalibrationUnits (string)
CalibrationLimits IM_INT (2)
CalibrationEquation IM_BYTE (1) [0-Linear,1-Exponential,2-Arbitrary,3-HyperbolicSine)]
CalibrationParam (string) [params separated by '\\n']
Title, Author, Description, Copyright, DateTime (string)
Software, Disclaimer, Warning, Source, Comment, ... (string)
DateTimeModified (string) [when writing uses the current system time]
ICCProfile IM_BYTE (N)
ScaleUnit (string) ["meters", "radians"]
XScale, YScale IM_FLOAT (1)
Comments:
When saving PNG image with TransparencyIndex or TransparencyMap, TransparencyMap has precedence,
so set it to NULL if you changed TransparencyIndex.
Attributes set after the image are ignored.
\endverbatim
* \ingroup format
\defgroup png PNG - Portable Network Graphic Format * \section Description * * \par * Access to the PNG file format uses libpng version 1.6.23. \n * http://www.libpng.org \n * Copyright (c) 2000-2002, 2004, 2006-2015 Glenn Randers-Pehrson * * \section Features * \verbatim Data Types: Byte and UShort Color Spaces: Gray, RGB, MAP and Binary Compressions: DEFLATE - LZ77 variation (ZIP) default Only one image. Can have an alpha channel. Internally the components are always packed. Internally the lines are arranged from top down to bottom. Handle(1) returns png_structp libPNG structure.
Attributes: ZIPQuality IM_INT (1) [1-9, default 6] (write only) ResolutionUnit (string) ["DPC", "DPI"] XResolution, YResolution IM_FLOAT (1) Interlaced (same as Progressive) IM_INT (1 | 0) default 0 Gamma IM_FLOAT (1) WhitePoint IMFLOAT (2) PrimaryChromaticities IMFLOAT (6) XPosition, YPosition IM_FLOAT (1) sRGBIntent IM_INT (1) [0: Perceptual, 1: Relative colorimetric, 2: Saturation, 3: Absolute colorimetric] TransparencyMap IM_BYTE (N) (for MAP images is the alpha value of the corresponding palette index) TransparencyIndex IM_BYTE (1) (for MAP images is the first index that has minimum alpha in TransparencyMap, for GRAY images is the index that it is fully transparent) TransparencyColor IM_BYTE (3) (for RGB images is the color that is full transparent) CalibrationName, CalibrationUnits (string) CalibrationLimits IM_INT (2) CalibrationEquation IM_BYTE (1) [0-Linear,1-Exponential,2-Arbitrary,3-HyperbolicSine)] CalibrationParam (string) [params separated by '\\n'] Title, Author, Description, Copyright, DateTime (string) Software, Disclaimer, Warning, Source, Comment, ... (string) DateTimeModified (string) [when writing uses the current system time] ICCProfile IM_BYTE (N) ScaleUnit (string) ["meters", "radians"] XScale, YScale IM_FLOAT (1)
Comments: When saving PNG image with TransparencyIndex or TransparencyMap, TransparencyMap has precedence, so set it to NULL if you changed TransparencyIndex. Attributes set after the image are ignored. \endverbatim * \ingroup format