public static void CreateThumbnail(string imageFilePath, string thumbnailFilePath, System.Drawing.Size size, bool removeTransparency)
{
if (string.IsNullOrEmpty(imageFilePath))
{
throw new ArgumentNullException("imageFilePath");
}
if (string.IsNullOrEmpty(thumbnailFilePath))
{
throw new ArgumentNullException("thumbnailFilePath");
}
if (size.IsEmpty)
{
throw new ArgumentException("Thumbnail size can not be empty", "size");
}
if (File.Exists(imageFilePath))
{
var pipeline = new Pipeline();
var reader = ImageReader.Create(imageFilePath);
pipeline.Add(reader);
var resizer = new Resize(size.Width, size.Height)
{
InterpolationMode = ResizeInterpolationMode.High, ResizeMode = ResizeMode.Fit
};
pipeline.Add(resizer);
if (removeTransparency && reader.PixelFormat.HasAlpha)
{
var cc = new ColorConverter(PixelFormat.DiscardAlpha(reader.PixelFormat));
cc.BackgroundColor = cc.ConvertColor(new RgbColor(255, 255, 255));
pipeline.Add(cc);
}
var writer = ImageWriter.Create(thumbnailFilePath);
if (writer is GifWriter)
{
ColorPalette palette = null;
using (var bitmap = reader.Frames[0].GetBitmap())
palette = ColorPalette.Create(bitmap);
pipeline.Add(new ColorConverter(PixelFormat.Format8bppIndexed)
{
Palette = palette
});
}
pipeline.Add(writer);
pipeline.Run();
pipeline.DisposeAllElements();
}
}
/// <summary>
/// Converts to indexed pixel format (optimized for Web)
/// </summary>
private static void ConvertToIndexed()
{
using (var bitmap = new Bitmap("../../../../_Input/Copenhagen_RGB.jpg"))
{
bitmap.ColorManagement.Dithering = DitheringType.FloydSteinberg;
bitmap.ColorManagement.Palette = ColorPalette.Create(bitmap, 64);
bitmap.ColorManagement.Convert(PixelFormat.Format8bppIndexed);
bitmap.Save("../../../../_Output/PF_ConvertToIndexed.png");
}
}
public void DetectColorPalettes()
{
ColorPalettes = new HashSet <ColorPalette>();
foreach (var file in Directory.GetFiles("Palettes", "*.png"))
{
var filename = Path.GetFullPath(file);
try
{
var pixelColors = BitmapUtils.LoadGlyphColors(filename);
var name = Path.GetFileNameWithoutExtension(file);
var glyphFont = ColorPalette.Create(name, pixelColors);
ColorPalettes.Add(glyphFont);
}
catch (Exception e)
{
ColorPalettes.Add(ColorPalette.CreateInvalid(filename, "Could not load palette from file: " + e.Message));
}
}
MessageBus.Publish(new ColorPaletteListLoadedEvent(ColorPalettes.ToArray()));
}
