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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Imaging;
namespace WinImageIndexPalette
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Image img = WinImageIndexPalette.Properties.Resources.image1;
//affiche l'image source
pictureBox1.Image = img;
//cree un bitmap à partir de l'image source
Bitmap bmpColor =new Bitmap( img);
//conversion en monochrome Format8bppIndexed
pictureBox2.Image = ConvertToMonochrome(bmpColor);
pictureBox2.Update();
//cree un autre bitmap à partir de l'image source
bmpColor = new Bitmap(img);
//conversion en couleur palette Format8bppIndexed
pictureBox3.Image = ConvertToIndexedColor(bmpColor);
pictureBox3.Update();
}
static unsafe Bitmap ConvertToMonochrome(Bitmap bmpColor)
{
int cx = bmpColor.Width;
int cy = bmpColor.Height;
// Create a new 8-bit indexed bitmap of the same size
Bitmap bmMono = new Bitmap(cx, cy, PixelFormat.Format8bppIndexed);
bmMono.SetResolution(bmpColor.HorizontalResolution,
bmpColor.VerticalResolution);
// definit l'instance palette à partir de
// bmpColoIndex.Palette car ColorPalette n' as pas
// de constructeur
// recolorie une palette de gris
ColorPalette pal = bmMono.Palette;
for (int i = 0; i < pal.Entries.Length; i++)
pal.Entries[i] = Color.FromArgb(i, i, i);
bmMono.Palette = pal;
// Because SetPixel won't work with index bitmaps, we need
// direct access to the bits
BitmapData bmd = bmMono.LockBits(
new Rectangle(Point.Empty, bmMono.Size),
ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);
// Scan through the pixels, converting color to B&W
Byte* pPixel = (Byte*)bmd.Scan0;
for (int y = 0; y < cy; y++)
{
for (int x = 0; x < cx; x++)
{
Color clr = bmpColor.GetPixel(x, y);
Byte byPixel = (byte)((30 * clr.R + 59 * clr.G + 11 * clr.B) / 100);
pPixel[x] = byPixel;
}
pPixel += bmd.Stride;
}
bmMono.UnlockBits(bmd);
return bmMono;
}
private void button2_Click(object sender, EventArgs e)
{
}
static unsafe Bitmap ConvertToIndexedColor(Bitmap bmpColor)
{
int cx = bmpColor.Width;
int cy = bmpColor.Height;
// Create a new 8-bit indexed bitmap of the same size
Bitmap bmpColoIndex = new Bitmap(cx, cy, PixelFormat.Format8bppIndexed);
bmpColoIndex.SetResolution(bmpColor.HorizontalResolution,
bmpColor.VerticalResolution);
// definit l'instance palette à partir de
// bmpColoIndex.Palette car ColorPalette n' as pas
// de constructeur
ColorPalette pal = bmpColoIndex.Palette;
Random rnd = new Random();
// recolorie une palette de couleurs aleatoires
for (int i = 0; i < pal.Entries.Length; i++)
pal.Entries[i] = Color.FromArgb(rnd.Next(0, 255), rnd.Next(0, 255), rnd.Next(0, 255));
bmpColoIndex.Palette = pal;
// Because SetPixel won't work with index bitmaps, we need
// direct access to the bits
BitmapData bmpData = bmpColoIndex.LockBits(
new Rectangle(Point.Empty, bmpColoIndex.Size),
ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);
// Scan through the pixels, converting color to random color
Byte* pPixel = (Byte*)bmpData.Scan0;
for (int y = 0; y < cy; y++)
{
for (int x = 0; x < cx; x++)
{
Color clr = bmpColor.GetPixel(x, y);
Byte byPixel = (byte)((30 * clr.R + 59 * clr.G + 11 * clr.B) / 200);
pPixel[x] = byPixel;
}
pPixel += bmpData.Stride;
}
bmpColoIndex.UnlockBits(bmpData);
return bmpColoIndex;
}
}
} |
