public void CompareQuantizedImages()
{
ReportStart();
_oq = new OctreeQuantizer( 255, 8 );
for( int colourCount = 1; colourCount < 500; colourCount += 50 )
{
Collection<Color> distinctColours;
Bitmap original = MakeBitmap( new Size( 50, 50 ), colourCount );
distinctColours = ImageTools.GetDistinctColours( original );
// Make sure the bitmap we've created has the number of colours we want
Assert.AreEqual( colourCount, distinctColours.Count );
Bitmap quantized = _oq.Quantize( original );
BitmapAssert.AreEqual( original, quantized, 60, // TODO: this is a rather large tolerance
colourCount + " colours" );
distinctColours = ImageTools.GetDistinctColours( quantized );
int expectedColours = colourCount > 256 ? 256 : colourCount;
// FIXME: 65-colour image is quantized down to 64 colours
// TODO: Check for exact number of colours once Octree quantizer stops reducing colour depth too much
// Assert.AreEqual( expectedColours, distinctColours.Count, colourCount + " colours" );
Assert.LessOrEqual( distinctColours.Count, expectedColours, colourCount + " colours" );
}
ReportEnd();
}
public PixelAnalysis(Image imageToStudy, QuantizerType quantizerType)
{
_imageToStudy = imageToStudy;
_colourQuality = 10;
_quantizerType = quantizerType;
GetColours(imageToStudy);
if (_distinctColours.Count > 256)
{
switch (quantizerType)
{
case QuantizerType.NeuQuant:
break;
case QuantizerType.Octree:
_oq = new OctreeQuantizer(255, 8);
// TODO: progress counters for Octree
break;
}
}
}
public void MaxColourBitsTooLarge()
{
ReportStart();
try
{
_oq = new OctreeQuantizer( 10, 9 );
}
catch( ArgumentOutOfRangeException ex )
{
string message = "This should be between 1 and 8";
StringAssert.Contains( message, ex.Message );
Assert.AreEqual( "maxColourBits", ex.ParamName );
Assert.AreEqual( 9, ex.ActualValue );
ReportEnd();
throw;
}
}
public void MaxColoursTooSmall()
{
ReportStart();
try
{
_oq = new OctreeQuantizer( 0, 8 );
}
catch( ArgumentOutOfRangeException ex )
{
string message = "The number of colours should be between 1 and 255";
StringAssert.Contains( message, ex.Message );
Assert.AreEqual( "maxColours", ex.ParamName );
Assert.AreEqual( 0, ex.ActualValue );
ReportEnd();
throw;
}
}
public PixelAnalysis( Image imageToStudy, QuantizerType quantizerType )
{
_imageToStudy = imageToStudy;
_colourQuality = 10;
_quantizerType = quantizerType;
GetColours( imageToStudy );
if( _distinctColours.Count > 256 )
{
switch( quantizerType )
{
case QuantizerType.NeuQuant:
break;
case QuantizerType.Octree:
_oq = new OctreeQuantizer( 255, 8 );
// TODO: progress counters for Octree
break;
}
}
}
