/// <summary>
/// Loading an image
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void openToolStripMenuItem_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = "Image files (*.bmp, *.png, *.jpg) | *.bmp; *.png; *.jpg";
if (ofd.ShowDialog() == DialogResult.OK)
{
string pathname = Path.GetFullPath(ofd.FileName);
Bitmap bm;
try
{
bm = new Bitmap(pathname);
original_texture = DirectBitmap.FromBitmap(bm);
dithering_texture = DirectBitmap.FromBitmap(bm);
texture_path = pathname;
}
catch
{
bm = new Bitmap(default_texture_path);
original_texture = DirectBitmap.FromBitmap(bm);
dithering_texture = DirectBitmap.FromBitmap(bm);
texture_path = default_texture_path;
}
RestartAlgorithms();
original_picturebox.Invalidate();
}
}
public Form1()
{
InitializeDefault();
InitializeComponent();
default_texture_path = System.IO.Path.GetDirectoryName(Assembly.GetEntryAssembly().Location) + "\\Textures\\lena.jpg";
original_texture = DirectBitmap.FromBitmap(new Bitmap(default_texture_path));
dithering_texture = DirectBitmap.FromBitmap(new Bitmap(default_texture_path));
}
/// <summary>
/// Floyd-Steinberg error diffusion algorithm
/// </summary>
private void ErrorDiffusion()
{
dithering_texture = DirectBitmap.FromBitmap(original_texture.Bitmap);
int width = original_texture.Width;
int height = original_texture.Height;
int R, G, B;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
Color px = dithering_texture.GetPixel(x, y);
R = FindClosestColor(px.R, Kr);
G = FindClosestColor(px.G, Kg);
B = FindClosestColor(px.B, Kb);
dithering_texture.SetPixel(x, y, Color.FromArgb(R, G, B));
float errr, errg, errb;
errr = (float)px.R - R;
errg = (float)px.G - G;
errb = (float)px.B - B;
if (x + 1 < width)
{
Color cx = dithering_texture.GetPixel(x + 1, y);
int r = cx.R + (int)errr * 7 / 16;
r = CorrectValue(r);
int g = cx.G + (int)errg * 7 / 16;
g = CorrectValue(g);
int b = cx.B + (int)errb * 7 / 16;
b = CorrectValue(b);
dithering_texture.SetPixel(x + 1, y, Color.FromArgb(r, g, b));
}
if (x - 1 >= 0 && y + 1 < height)
{
Color cx = dithering_texture.GetPixel(x - 1, y + 1);
int r = cx.R + (int)errr * 3 / 16;
r = CorrectValue(r);
int g = cx.G + (int)errg * 3 / 16;
g = CorrectValue(g);
int b = cx.B + (int)errb * 3 / 16;
b = CorrectValue(b);
dithering_texture.SetPixel(x - 1, y + 1, Color.FromArgb(r, g, b));
}
if (y + 1 < height)
{
Color cx = dithering_texture.GetPixel(x, y + 1);
int r = cx.R + (int)errr * 5 / 16;
r = CorrectValue(r);
int g = cx.G + (int)errg * 5 / 16;
g = CorrectValue(g);
int b = cx.B + (int)errb * 5 / 16;
b = CorrectValue(b);
dithering_texture.SetPixel(x, y + 1, Color.FromArgb(r, g, b));
}
if (x + 1 < width && y + 1 < height)
{
Color cx = dithering_texture.GetPixel(x + 1, y + 1);
int r = cx.R + (int)errr * 1 / 16;
r = CorrectValue(r);
int g = cx.G + (int)errg * 1 / 16;
g = CorrectValue(g);
int b = cx.B + (int)errb * 1 / 16;
b = CorrectValue(b);
dithering_texture.SetPixel(x + 1, y + 1, Color.FromArgb(r, g, b));
}
}
}
}
