/// <summary>
/// Calculate reduced color palette for the specified image.
/// </summary>
///
/// <param name="image">Image to calculate palette for.</param>
/// <param name="paletteSize">Palette size to calculate.</param>
///
/// <returns>Return reduced color palette for the specified image.</returns>
///
/// <remarks><para>The method processes the specified image and feeds color value of each pixel
/// to the specified color quantization algorithm. Finally it returns color palette built by
/// that algorithm.</para></remarks>
///
/// <exception cref="UnsupportedImageFormatException">Unsupported format of the source image - it must 24 or 32 bpp color image.</exception>
///
public Color[] CalculatePalette(UnmanagedImage image, int paletteSize)
{
if ((image.PixelFormat != PixelFormat.Format24bppRgb) &&
(image.PixelFormat != PixelFormat.Format32bppRgb) &&
(image.PixelFormat != PixelFormat.Format32bppArgb) &&
(image.PixelFormat != PixelFormat.Format32bppPArgb))
{
throw new UnsupportedImageFormatException("Unsupported format of the source image.");
}
quantizer.Clear( );
int width = image.Width;
int height = image.Height;
int pixelSize = Bitmap.GetPixelFormatSize(image.PixelFormat) / 8;
unsafe
{
byte *ptr = (byte *)image.ImageData.ToPointer( );
int offset = image.Stride - width * pixelSize;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++, ptr += pixelSize)
{
quantizer.AddColor(Color.FromArgb(ptr[RGB.R], ptr[RGB.G], ptr[RGB.B]));
}
ptr += offset;
}
}
return(quantizer.GetPalette(paletteSize));
}
private void UpdateImages()
{
activeQuantizer.Clear();
try
{
if (listMethod.SelectedIndex <= 1)
{
Image targetImage = GetQuantizedImage(SourceImage);
pictureSource.Image = SourceImage;
ImageSizeLabel.Text = SourceImage.Width + " x " + SourceImage.Height;
pictureTarget.Image = targetImage;
}
else
{
Bitmap b = new Bitmap(Ditherhelper.Dithering(SourceImage));
ColorDistanceBox.Text = ColorDistance.GetColorDistance(this.SourceImage, b).ToString();
pictureTarget.Image = b;
pictureSource.Image = SourceImage;
ImageSizeLabel.Text = SourceImage.Width + " x " + SourceImage.Height;
//GetPaletteBitmap(palette);
}
}
catch (NotSupportedException ex)
{
MessageBox.Show(ex.Message);
}
}
public unsafe Color[] CalculatePalette(UnmanagedImage image, int paletteSize)
{
if (image.PixelFormat != PixelFormat.Format24bppRgb && image.PixelFormat != PixelFormat.Format32bppRgb && image.PixelFormat != PixelFormat.Format32bppArgb && image.PixelFormat != PixelFormat.Format32bppPArgb)
{
throw new UnsupportedImageFormatException("Unsupported format of the source image.");
}
quantizer.Clear();
int width = image.Width;
int height = image.Height;
int num = System.Drawing.Image.GetPixelFormatSize(image.PixelFormat) / 8;
byte *ptr = (byte *)image.ImageData.ToPointer();
int num2 = image.Stride - width * num;
for (int i = 0; i < height; i++)
{
int num3 = 0;
while (num3 < width)
{
quantizer.AddColor(Color.FromArgb(ptr[2], ptr[1], *ptr));
num3++;
ptr += num;
}
ptr += num2;
}
return(quantizer.GetPalette(paletteSize));
}
private void UpdateImages()
{
// prepares quantizer
activeQuantizer.Clear();
// updates source image
UpdateSourceImage();
// tries to retrieve an image based on HSB quantization
try
{
DateTime before = DateTime.Now;
Image targetImage = GetQuantizedImage(sourceImage);
TimeSpan duration = DateTime.Now - before;
TimeSpan perPixel = new TimeSpan(duration.Ticks / (sourceImage.Width * sourceImage.Height));
pictureTarget.Image = targetImage;
// new GIF and PNG sizes
Int32 newGifSize, newPngSize;
// retrieves a GIF image based on our HSB-quantized one
GetConvertedImage(targetImage, ImageFormat.Gif, out newGifSize);
// retrieves a PNG image based on our HSB-quantized one
GetConvertedImage(targetImage, ImageFormat.Png, out newPngSize);
// spits out the statistics
Text = string.Format("Simple palette quantizer (duration {0}, per pixel {1})", duration, perPixel);
editProjectedGifSize.Text = projectedGifSize.ToString();
editProjectedPngSize.Text = sourceFileInfo.Length.ToString();
editNewGifSize.Text = newGifSize.ToString();
editNewPngSize.Text = newPngSize.ToString();
}
catch (NotSupportedException ex)
{
MessageBox.Show(ex.Message);
}
}
public void UpdateImages()
{
quantizer = new PaletteQuantizer();
quantizer.Clear();
ergebnis = GetQuantizedImage(sourceImage);
}
