C# Class ImageUtility.Bitmap

The Bitmap class should be used to replace the standard System.Drawing.Bitmap The big advantage of the Bitmap class is to accurately read back the color profile and gamma correction data stored in the image's metadata so that, internally, the image is stored: • As device-independent CIE XYZ (http://en.wikipedia.org/wiki/CIE_1931_color_space) format, our Profile Connection Space • In linear space (i.e. no gamma curve is applied) • NOT pre-multiplied alpha (you can later re-pre-multiply if needed) This helps to ensure that whatever the source image format stored on disk, you always deal with a uniformized image internally. Later, you can cast from the CIE XYZ device-independent format into any number of pre-defined texture profiles: • sRGB or Linear space textures (for 8bits per component images only) • Compressed (BC1-BC5) or uncompressed (for 8bits per component images only) • 8-, 16-, 16F- 32- or 32F-bits per component • Pre-multiplied alpha or not The following image formats are currently supported: • JPG • PNG • TIFF • TGA • BMP • GIF • HDR • Any RAW camera format supported by the LibRaw library

The Bitmap class has been tested with various formats, various bit depths and color profiles all created from Adobe Photoshop CS4 using the "Save As" dialog and the "Save for Web & Devices" dialog box. In a general manner, you should NOT use the latter save option but rather select your working color profile from the "Edit > Color Settings" menu, then save your files and make sure you tick the "ICC Profile" checkbox using the DEFAULT save file dialog box to embed that profile in the image.

Inheritance: IDisposable

显示文件 Open project: Patapom/GodComplex Class Usage Examples

Protected Properties

Property	Type	Description
m_Aperture	float
m_Bitmap	].float4[
m_ColorProfile	ColorProfile
m_FocalLength	float
m_Height	int
m_ISOSpeed	float
m_ShutterSpeed	float
m_Type	FILE_TYPE
m_Width	int
m_bHasAlpha	bool
m_bHasValidShotInfo	bool
ms_ConvertContent2XYZ	bool
ms_ReadContent	bool

Public Methods

Method	Description
BilinearSample ( float X, float Y ) : float4	Performs bilinear sampling of the XYZ content
Bitmap ( System _ImageFileName ) : System	Creates a bitmap from a file
Bitmap ( System _ImageFileName, ColorProfile _ProfileOverride ) : System	Creates a bitmap from a file
Bitmap ( System _ImageStream, FILE_TYPE _FileType ) : System	Creates a bitmap from a stream
Bitmap ( System _ImageStream, FILE_TYPE _FileType, ColorProfile _ProfileOverride ) : System	Creates a bitmap from a stream
Bitmap ( System _ImageStream, System _ImageFileNameName ) : System	Creates a bitmap from a stream
Bitmap ( System _ImageStream, System _ImageFileNameName, ColorProfile _ProfileOverride ) : System	Creates a bitmap from a stream
Bitmap ( byte _ImageFileContent, FILE_TYPE _FileType ) : System	Creates a bitmap from memory
Bitmap ( byte _ImageFileContent, FILE_TYPE _FileType, ColorProfile _ProfileOverride ) : System	Creates a bitmap from memory
Bitmap ( byte _ImageFileContent, System _ImageFileNameName ) : System	Creates a bitmap from memory
Bitmap ( byte _ImageFileContent, System _ImageFileNameName, ColorProfile _ProfileOverride ) : System	Creates a bitmap from memory
Bitmap ( int _Width, int _Height, ColorProfile _Profile ) : System	Manual creation
DecodeRGBEImage ( PF_RGBE _Source, bool _bSourceIsXYZ, bool _bTargetNeedsXYZ, ColorProfile _ColorProfile ) : ].float4[	Decodes a RGBE formatted image into a plain floating-point image
DecodeRGBEImage ( PF_RGBE _Source, bool _bSourceIsXYZ, float4 _Target, bool _bTargetNeedsXYZ, ColorProfile _ColorProfile ) : void	Decodes a RGBE formatted image into a plain floating-point image
Dispose ( ) : void
GetFileType ( System _ImageFileNameName ) : FILE_TYPE	Retrieves the image file type based on the image file name
Load ( System _ImageFileName, FILE_TYPE _FileType ) : void	Loads from disk
Load ( System _ImageFileName, FILE_TYPE _FileType, ColorProfile _ProfileOverride ) : void
Load ( byte _ImageFileContent, FILE_TYPE _FileType ) : void	Actual load from a byte[] in memory
Load ( byte _ImageFileContent, FILE_TYPE _FileType, ColorProfile _ProfileOverride ) : void
LoadAndDecodeHDRFormat ( byte _HDRFormatBinary, bool _bTargetNeedsXYZ, ColorProfile _ProfileOverride, ColorProfile &_ColorProfile ) : ].float4[	Loads a bitmap in .HDR format into a float4 array directly useable by the image constructor
LoadBitmap ( System _Bitmap, int &_Width, int &_Height ) : byte[]	Loads a System.Drawing.Bitmap into a byte[] containing RGBARGBARG... pixels
LoadHDRFormat ( byte _HDRFormatBinary, ColorProfile _ProfileOverride, bool &_bIsXYZ, ColorProfile &_ColorProfile ) : ].PF_RGBE[	Loads a bitmap in .HDR format into a RGBE array
Save ( System _FileName ) : void	Save to a file
Save ( System _Stream, FILE_TYPE _FileType, FORMAT_FLAGS _Parms, FormatEncoderOptions _Options ) : void	Save to a stream
Save ( System _FileName, FORMAT_FLAGS _Parms ) : void
Save ( System _FileName, FORMAT_FLAGS _Parms, FormatEncoderOptions _Options ) : void

Protected Methods

Method	Description
ConvertFrame ( System _Format ) : System.Windows.Media.Imaging.BitmapFrame	Converts the generic XYZ+A bitmap to the specified format frame
ConvertFrame ( System.Windows.Media.Imaging.BitmapSource _Frame ) : void	Converts the source bitmap to a generic RGBA32F format I cannot use the FormatConvertedBitmap class because it applies some unwanted gamma correction depending on the source pixel format. For example, if the image is using the Bgr24 format that uses a 1/2.2 gamma internally, converting that to our generic format Rgba128Float (that uses a gamma of 1 internally) will automatically apply a pow( 2.2 ) to the RGB values, which is NOT what we're looking for since we're handling gamma correction ourselves here !
FLOAT_TO_BYTE ( float v ) : byte
FLOAT_TO_WORD ( float v ) : UInt16
RadianceFileFindInHeader ( List _HeaderLines, string _Search ) : string

Method Details

BilinearSample() public method

Performs bilinear sampling of the XYZ content

public BilinearSample ( float X, float Y ) : float4
X	float	A column index in [0,Width[ (will be clamped if out of range)
Y	float	A row index in [0,Height[ (will be clamped if out of range)
return	float4

Bitmap() public method

Creates a bitmap from a file

public Bitmap ( System _ImageFileName ) : System
_ImageFileName	System
return	System

Bitmap() public method

Creates a bitmap from a file

public Bitmap ( System _ImageFileName, ColorProfile _ProfileOverride ) : System
_ImageFileName	System
_ProfileOverride	ColorProfile
return	System

Bitmap() public method

Creates a bitmap from a stream

public Bitmap ( System _ImageStream, FILE_TYPE _FileType ) : System
_ImageStream	System	The image stream to load the bitmap from
_FileType	FILE_TYPE	The image type
return	System

Bitmap() public method

Creates a bitmap from a stream

public Bitmap ( System _ImageStream, FILE_TYPE _FileType, ColorProfile _ProfileOverride ) : System
_ImageStream	System	The image stream to load the bitmap from
_FileType	FILE_TYPE	The image type
_ProfileOverride	ColorProfile
return	System

Bitmap() public method

Creates a bitmap from a stream

public Bitmap ( System _ImageStream, System _ImageFileNameName ) : System
_ImageStream	System	The image stream to load the bitmap from
_ImageFileNameName	System	The name of the image file the stream is coming from originally (used to identify image file type)
return	System

Bitmap() public method

Creates a bitmap from a stream

public Bitmap ( System _ImageStream, System _ImageFileNameName, ColorProfile _ProfileOverride ) : System
_ImageStream	System	The image stream to load the bitmap from
_ImageFileNameName	System	The name of the image file the stream is coming from originally (used to identify image file type)
_ProfileOverride	ColorProfile
return	System

Bitmap() public method

Creates a bitmap from memory

public Bitmap ( byte _ImageFileContent, FILE_TYPE _FileType ) : System
_ImageFileContent	byte	The memory buffer to load the bitmap from
_FileType	FILE_TYPE	The image type
return	System

Bitmap() public method

Creates a bitmap from memory

public Bitmap ( byte _ImageFileContent, FILE_TYPE _FileType, ColorProfile _ProfileOverride ) : System
_ImageFileContent	byte	The memory buffer to load the bitmap from
_FileType	FILE_TYPE	The image type
_ProfileOverride	ColorProfile
return	System

Bitmap() public method

Creates a bitmap from memory

public Bitmap ( byte _ImageFileContent, System _ImageFileNameName ) : System
_ImageFileContent	byte	The memory buffer to load the bitmap from
_ImageFileNameName	System	The name of the image file the stream is coming from originally (used to identify image file type)
return	System

Bitmap() public method

Creates a bitmap from memory

public Bitmap ( byte _ImageFileContent, System _ImageFileNameName, ColorProfile _ProfileOverride ) : System
_ImageFileContent	byte	The memory buffer to load the bitmap from
_ImageFileNameName	System	The name of the image file the stream is coming from originally (used to identify image file type)
_ProfileOverride	ColorProfile
return	System

Bitmap() public method

Manual creation

public Bitmap ( int _Width, int _Height, ColorProfile _Profile ) : System
_Width	int
_Height	int
_Profile	ColorProfile	An optional color profile, you will need a valid profile if you wish to save the bitmap!
return	System

ConvertFrame() protected method

Converts the generic XYZ+A bitmap to the specified format frame

protected ConvertFrame ( System _Format ) : System.Windows.Media.Imaging.BitmapFrame
_Format	System	The format to convert into
return	System.Windows.Media.Imaging.BitmapFrame

ConvertFrame() protected method

Converts the source bitmap to a generic RGBA32F format

I cannot use the FormatConvertedBitmap class because it applies some unwanted gamma correction depending on the source pixel format. For example, if the image is using the Bgr24 format that uses a 1/2.2 gamma internally, converting that to our generic format Rgba128Float (that uses a gamma of 1 internally) will automatically apply a pow( 2.2 ) to the RGB values, which is NOT what we're looking for since we're handling gamma correction ourselves here !

protected ConvertFrame ( System.Windows.Media.Imaging.BitmapSource _Frame ) : void
_Frame	System.Windows.Media.Imaging.BitmapSource	The source frame to convert
return	void

DecodeRGBEImage() public static method

Decodes a RGBE formatted image into a plain floating-point image

public static DecodeRGBEImage ( PF_RGBE _Source, bool _bSourceIsXYZ, bool _bTargetNeedsXYZ, ColorProfile _ColorProfile ) : ].float4[
_Source	PF_RGBE	The source RGBE formatted image
_bSourceIsXYZ	bool	Tells if the source image is encoded as XYZE rather than RGBE
_bTargetNeedsXYZ	bool	Tells if the target needs to be in CIE XYZ space (true) or RGB (false)
_ColorProfile	ColorProfile	The color profile for the image
return	].float4[

DecodeRGBEImage() public static method

Decodes a RGBE formatted image into a plain floating-point image

public static DecodeRGBEImage ( PF_RGBE _Source, bool _bSourceIsXYZ, float4 _Target, bool _bTargetNeedsXYZ, ColorProfile _ColorProfile ) : void
_Source	PF_RGBE	The source RGBE formatted image
_bSourceIsXYZ	bool	Tells if the source image is encoded as XYZE rather than RGBE
_Target	float4	The target float4 image
_bTargetNeedsXYZ	bool	Tells if the target needs to be in CIE XYZ space (true) or RGB (false)
_ColorProfile	ColorProfile	The color profile for the image
return	void

Dispose() public method

public Dispose ( ) : void
return	void

FLOAT_TO_BYTE() protected method

protected FLOAT_TO_BYTE ( float v ) : byte
v	float
return	byte

FLOAT_TO_WORD() protected method

protected FLOAT_TO_WORD ( float v ) : UInt16
v	float
return	System.UInt16

GetFileType() public static method

Retrieves the image file type based on the image file name

public static GetFileType ( System _ImageFileNameName ) : FILE_TYPE
_ImageFileNameName	System	The image file name
return	FILE_TYPE

Load() public method

Loads from disk

public Load ( System _ImageFileName, FILE_TYPE _FileType ) : void
_ImageFileName	System
_FileType	FILE_TYPE
return	void

Load() public method

public Load ( System _ImageFileName, FILE_TYPE _FileType, ColorProfile _ProfileOverride ) : void
_ImageFileName	System
_FileType	FILE_TYPE
_ProfileOverride	ColorProfile
return	void

Load() public method

Actual load from a byte[] in memory

Occurs if the image type is not supported by the Bitmap class Occurs if the source image format cannot be converted to RGBA32F which is the generic format we read from

public Load ( byte _ImageFileContent, FILE_TYPE _FileType ) : void
_ImageFileContent	byte	The source image content as a byte[]
_FileType	FILE_TYPE	The type of file to load
return	void

Load() public method

public Load ( byte _ImageFileContent, FILE_TYPE _FileType, ColorProfile _ProfileOverride ) : void
_ImageFileContent	byte
_FileType	FILE_TYPE
_ProfileOverride	ColorProfile
return	void

LoadAndDecodeHDRFormat() public static method

Loads a bitmap in .HDR format into a float4 array directly useable by the image constructor

public static LoadAndDecodeHDRFormat ( byte _HDRFormatBinary, bool _bTargetNeedsXYZ, ColorProfile _ProfileOverride, ColorProfile &_ColorProfile ) : ].float4[
_HDRFormatBinary	byte
_bTargetNeedsXYZ	bool	Tells if the target needs to be in CIE XYZ space (true) or RGB (false)
_ProfileOverride	ColorProfile
_ColorProfile	ColorProfile	The color profile for the image
return	].float4[

LoadBitmap() public static method

Loads a System.Drawing.Bitmap into a byte[] containing RGBARGBARG... pixels

public static LoadBitmap ( System _Bitmap, int &_Width, int &_Height ) : byte[]
_Bitmap	System	The source System.Drawing.Bitmap to load
_Width	int	The bitmap's width
_Height	int	The bitmaps's height
return	byte[]

LoadHDRFormat() public static method

Loads a bitmap in .HDR format into a RGBE array

public static LoadHDRFormat ( byte _HDRFormatBinary, ColorProfile _ProfileOverride, bool &_bIsXYZ, ColorProfile &_ColorProfile ) : ].PF_RGBE[
_HDRFormatBinary	byte
_ProfileOverride	ColorProfile
_bIsXYZ	bool	Tells if the image is encoded as XYZE rather than RGBE
_ColorProfile	ColorProfile	The color profile for the image
return	].PF_RGBE[

RadianceFileFindInHeader() protected static method

protected static RadianceFileFindInHeader ( List _HeaderLines, string _Search ) : string
_HeaderLines	List
_Search	string
return	string

Save() public method

Save to a file

public Save ( System _FileName ) : void
_FileName	System
return	void

Save() public method

Save to a stream

Occurs if the image type is not supported by the Bitmap class Occurs if the source image format cannot be converted to RGBA32F which is the generic format we read from

public Save ( System _Stream, FILE_TYPE _FileType, FORMAT_FLAGS _Parms, FormatEncoderOptions _Options ) : void
_Stream	System	The stream to write the image to
_FileType	FILE_TYPE	The file type to save as
_Parms	FORMAT_FLAGS	Additional formatting flags
_Options	FormatEncoderOptions	An optional block of options for encoding
return	void

Save() public method

public Save ( System _FileName, FORMAT_FLAGS _Parms ) : void
_FileName	System
_Parms	FORMAT_FLAGS
return	void

Save() public method

public Save ( System _FileName, FORMAT_FLAGS _Parms, FormatEncoderOptions _Options ) : void
_FileName	System
_Parms	FORMAT_FLAGS
_Options	FormatEncoderOptions
return	void

Property Details

m_Aperture protected_oe property

protected float m_Aperture
return	float

m_Bitmap protected_oe property

protected float4[,] m_Bitmap
return	].float4[

m_ColorProfile protected_oe property

protected ColorProfile,ImageUtility m_ColorProfile
return	ColorProfile

m_FocalLength protected_oe property

protected float m_FocalLength
return	float

m_Height protected_oe property

protected int m_Height
return	int

m_ISOSpeed protected_oe property

protected float m_ISOSpeed
return	float

m_ShutterSpeed protected_oe property

protected float m_ShutterSpeed
return	float

m_Type protected_oe property

protected FILE_TYPE m_Type
return	FILE_TYPE

m_Width protected_oe property

protected int m_Width
return	int

m_bHasAlpha protected_oe property

protected bool m_bHasAlpha
return	bool

m_bHasValidShotInfo protected_oe property

protected bool m_bHasValidShotInfo
return	bool

ms_ConvertContent2XYZ protected_oe static_oe property

protected static bool ms_ConvertContent2XYZ
return	bool

ms_ReadContent protected_oe static_oe property

protected static bool ms_ReadContent
return	bool