/// <summary>
/// Convert a linear sRGB color to an sRGB color
/// </summary>
public static tMat3x3 CalcColorSpaceConversion_RGB_to_XYZ(Chromaticities chromaticities)
{
return(CalcColorSpaceConversion_RGB_to_XYZ(
new tVec2(chromaticities.RedX, chromaticities.RedY),
new tVec2(chromaticities.GreenX, chromaticities.GreenY),
new tVec2(chromaticities.BlueX, chromaticities.BlueY),
new tVec2(chromaticities.WhiteX, chromaticities.WhiteY)));
}
/// <summary>
/// Attempts to handle an ICC profile by name
/// </summary>
/// <param name="_ProfilName"></param>
/// <returns>True if the profile was recognized</returns>
protected bool HandleICCProfileString( string _ProfilName )
{
if ( _ProfilName.IndexOf( "sRGB IEC61966-2.1" ) != -1 )
{
m_Chromaticities = Chromaticities.sRGB;
return true;
}
else if ( _ProfilName.IndexOf( "Adobe RGB (1998)" ) != -1 )
{
m_Chromaticities = Chromaticities.AdobeRGB_D65;
return true;
}
else if ( _ProfilName.IndexOf( "ProPhoto" ) != -1 )
{
m_Chromaticities = Chromaticities.ProPhoto;
return true;
}
return false;
}
private bool Equals( Chromaticities other )
{
return Equals( R, other.R ) && Equals( G, other.G ) && Equals( B, other.B ) && Equals( W, other.W );
}
/// <summary>
/// Build from a standard profile
/// </summary>
/// <param name="_Profile"></param>
public ColorProfile( STANDARD_PROFILE _Profile )
{
switch ( _Profile )
{
case STANDARD_PROFILE.LINEAR:
m_Chromaticities = Chromaticities.sRGB;
m_GammaCurve = GAMMA_CURVE.STANDARD;
m_Gamma = 1.0f;
break;
case STANDARD_PROFILE.sRGB:
m_Chromaticities = Chromaticities.sRGB;
m_GammaCurve = GAMMA_CURVE.sRGB;
m_Gamma = GAMMA_EXPONENT_sRGB;
break;
case STANDARD_PROFILE.ADOBE_RGB_D50:
m_Chromaticities = Chromaticities.AdobeRGB_D50;
m_GammaCurve = GAMMA_CURVE.STANDARD;
m_Gamma = GAMMA_EXPONENT_ADOBE;
break;
case STANDARD_PROFILE.ADOBE_RGB_D65:
m_Chromaticities = Chromaticities.AdobeRGB_D65;
m_GammaCurve = GAMMA_CURVE.STANDARD;
m_Gamma = GAMMA_EXPONENT_ADOBE;
break;
case STANDARD_PROFILE.PRO_PHOTO:
m_Chromaticities = Chromaticities.ProPhoto;
m_GammaCurve = GAMMA_CURVE.PRO_PHOTO;
m_Gamma = GAMMA_EXPONENT_PRO_PHOTO;
break;
case STANDARD_PROFILE.RADIANCE:
m_Chromaticities = Chromaticities.Radiance;
m_GammaCurve = GAMMA_CURVE.STANDARD;
m_Gamma = 1.0f;
break;
default:
throw new Exception( "Unsupported standard profile!" );
}
BuildTransformFromChroma( true );
}
/// <summary>
/// Attempts to handle a color profile from the EXIF ColorSpace tag
/// </summary>
/// <param name="_ColorSpace"></param>
/// <returns>True if the profile was recognized</returns>
protected bool HandleEXIFColorSpace( int _ColorSpace )
{
switch ( _ColorSpace )
{
case 1:
m_Chromaticities = Chromaticities.sRGB; // This is definitely sRGB
return true; // We now know the profile !
case 2:
m_Chromaticities = Chromaticities.AdobeRGB_D65; // This is not official but sometimes it's AdobeRGB
return true; // We now know the profile !
}
return false;
}
protected void EnumerateMetaDataPNG( BitmapMetadata _MetaData, out bool _bProfileFound, out bool _bGammaWasSpecified )
{
bool bGammaWasSpecified = false;
bool bProfileFound = false;
EnumerateMetaData( _MetaData,
// Read chromaticities
new MetaDataProcessor( "/cHRM", ( object v ) =>
{
BitmapMetadata ChromaData = v as BitmapMetadata;
Chromaticities TempChroma = Chromaticities.Empty;
EnumerateMetaData( ChromaData,
new MetaDataProcessor( "/RedX", ( object v2 ) => { TempChroma.R.x = 0.00001f * (uint) v2; } ),
new MetaDataProcessor( "/RedY", ( object v2 ) => { TempChroma.R.y = 0.00001f * (uint) v2; } ),
new MetaDataProcessor( "/GreenX", ( object v2 ) => { TempChroma.G.x = 0.00001f * (uint) v2; } ),
new MetaDataProcessor( "/GreenY", ( object v2 ) => { TempChroma.G.y = 0.00001f * (uint) v2; } ),
new MetaDataProcessor( "/BlueX", ( object v2 ) => { TempChroma.B.x = 0.00001f * (uint) v2; } ),
new MetaDataProcessor( "/BlueY", ( object v2 ) => { TempChroma.B.y = 0.00001f * (uint) v2; } ),
new MetaDataProcessor( "/WhitePointX", ( object v2 ) => { TempChroma.W.x = 0.00001f * (uint) v2; } ),
new MetaDataProcessor( "/WhitePointY", ( object v2 ) => { TempChroma.W.y = 0.00001f * (uint) v2; } )
);
if ( TempChroma.RecognizedChromaticity != STANDARD_PROFILE.INVALID )
{ // Assign new chroma values
m_Chromaticities = TempChroma;
bProfileFound = true;
}
} ),
// Read gamma
new MetaDataProcessor( "/gAMA/ImageGamma", ( object v ) => {
m_GammaCurve = GAMMA_CURVE.STANDARD; m_Gamma = 1.0f / (0.00001f * (uint) v); bGammaWasSpecified = true;
} ),
// Read explicit sRGB
new MetaDataProcessor( "/sRGB/RenderingIntent", ( object v ) => {
m_Chromaticities = Chromaticities.sRGB; bProfileFound = true; bGammaWasSpecified = false;
} ),
// Read string profile from iTXT
new MetaDataProcessor( "/iTXt/TextEntry", ( object v ) =>
{
if ( bProfileFound )
return; // No need...
// Hack content !
string XMLContent = v as string;
string ICCProfile = FindAttribute( XMLContent, "photoshop:ICCProfile" );
if ( ICCProfile != null && (bProfileFound = HandleICCProfileString( ICCProfile )) )
return;
string ColorSpace = FindAttribute( XMLContent, "exif:ColorSpace" );
if ( ColorSpace != null )
bProfileFound = HandleEXIFColorSpace( ColorSpace );
} )
);
_bGammaWasSpecified = bGammaWasSpecified;
_bProfileFound = bProfileFound;
}
/// <summary>
/// Creates a color profile from chromaticities
/// </summary>
/// <param name="_Chromaticities">The chromaticities for this profile</param>
/// <param name="_GammaCurve">The type of gamma curve to use</param>
/// <param name="_Gamma">The gamma power</param>
public ColorProfile( Chromaticities _Chromaticities, GAMMA_CURVE _GammaCurve, float _Gamma )
{
m_Chromaticities = _Chromaticities;
m_GammaCurve = _GammaCurve;
m_Gamma = _Gamma;
BuildTransformFromChroma( true );
}
/// <summary>
/// Creates the color profile from metadata embedded in the image file
/// </summary>
/// <param name="_MetaData"></param>
/// <param name="_FileType"></param>
public ColorProfile( BitmapMetadata _MetaData, Bitmap.FILE_TYPE _FileType )
{
string MetaDump = _MetaData != null ? DumpMetaData( _MetaData ) : null;
bool bGammaFoundInFile = false;
switch ( _FileType ) {
case Bitmap.FILE_TYPE.JPEG:
m_GammaCurve = GAMMA_CURVE.STANDARD;
m_Gamma = 2.2f; // JPG uses a 2.2 gamma by default
m_Chromaticities = Chromaticities.sRGB; // Default for JPEGs is sRGB
EnumerateMetaDataJPG( _MetaData, out m_bProfileFoundInFile, out bGammaFoundInFile );
if ( !m_bProfileFoundInFile && !bGammaFoundInFile )
bGammaFoundInFile = true; // Unless specified otherwise, we override the gamma no matter what since JPEGs use a 2.2 gamma by default anyway
break;
case Bitmap.FILE_TYPE.PNG:
m_GammaCurve = GAMMA_CURVE.sRGB;
m_Gamma = GAMMA_EXPONENT_sRGB;
m_Chromaticities = Chromaticities.sRGB; // Default for PNGs is standard sRGB
EnumerateMetaDataPNG( _MetaData, out m_bProfileFoundInFile, out bGammaFoundInFile );
break;
case Bitmap.FILE_TYPE.TIFF:
m_GammaCurve = GAMMA_CURVE.STANDARD;
m_Gamma = 1.0f; // Linear gamma by default
m_Chromaticities = Chromaticities.sRGB; // Default for TIFFs is sRGB
EnumerateMetaDataTIFF( _MetaData, out m_bProfileFoundInFile, out bGammaFoundInFile );
break;
case Bitmap.FILE_TYPE.GIF:
m_GammaCurve = GAMMA_CURVE.STANDARD;
m_Gamma = 1.0f;
m_Chromaticities = Chromaticities.sRGB; // Default for GIFs is standard sRGB with no gamma
break;
case Bitmap.FILE_TYPE.BMP: // BMP Don't have metadata!
m_GammaCurve = GAMMA_CURVE.STANDARD;
m_Gamma = 1.0f;
m_Chromaticities = Chromaticities.sRGB; // Default for BMPs is standard sRGB with no gamma
break;
case Bitmap.FILE_TYPE.CRW: // Raw files have no correction
case Bitmap.FILE_TYPE.CR2:
case Bitmap.FILE_TYPE.DNG:
m_GammaCurve = GAMMA_CURVE.STANDARD;
m_Gamma = 1.0f;
m_Chromaticities = Chromaticities.sRGB; // Default for BMPs is standard sRGB with no gamma
break;
}
BuildTransformFromChroma( bGammaFoundInFile );
}