我改变了我的问题。
忽略的色彩和噪音......对比似乎工作......
黑色和白色的工作，但，不trackbar1.value。
相比之下，我使用对比= 0.04f * trackbar1.value的。
我不知道如何把我的黑色和白色的trackbar1.value。
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.IO;
using System.Drawing.Imaging;
namespace Lab1___J
{
public partial class Form1 : Form
{
Image file;
Bitmap bm_image;
int i_change;
float contrast = 0;
public Form1()
{
InitializeComponent();
}
private void RB_contrast_CheckedChanged(object sender, EventArgs e)
{
LBL_color1.Text = "Less";
LBL_color2.Text = "More";
trackBar1.SetRange(0, 100);
trackBar1.TickFrequency = 5;
}
private void RB_blackwhite_CheckedChanged(object sender, EventArgs e)
{
LBL_color1.Text = "Less";
LBL_color2.Text = "More";
trackBar1.SetRange(0, 100);
trackBar1.TickFrequency = 5;
}
private void RB_tint_CheckedChanged(object sender, EventArgs e)
{
trackBar1.SetRange(0, 100);
trackBar1.TickFrequency = 5;
LBL_color1.Text = "Red";
LBL_color2.Text = "Green";
}
private void RB_noise_CheckedChanged(object sender, EventArgs e)
{
LBL_color1.Text = "Less";
LBL_color2.Text = "More";
trackBar1.SetRange(0, 100);
trackBar1.TickFrequency = 5;
}
private void BTN_loadpic_Click(object sender, EventArgs e)
{
Stream myStream = null;
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.InitialDirectory = "c:\\";
openFileDialog1.Filter = "Bitmap Files (*.bmp;*.dib)|*.*|JPEG (*.jpg;*.jpeg;*.jpe;*.jfif)|*.* |PNG (*.png)|*.*|GIF (*.gif)|*.*|All files (*.*)|*.*";
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
try
{
if ((myStream = openFileDialog1.OpenFile()) != null)
{
using (myStream)
{
file = Image.FromFile(openFileDialog1.FileName);
bm_image = new Bitmap(openFileDialog1.FileName);
pictureBox1.Image = file;
}
}
}
catch (Exception)
{
MessageBox.Show("Error: Could not read file.", "PicBender",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
private void trackBar1_Scroll(object sender, EventArgs e)
{
lbl_Tracknum.Text = trackBar1.Value.ToString();
i_change = int.Parse(trackBar1.Value.ToString());
}
private void BTN_transform_Click(object sender, EventArgs e)
{
bm_image = new Bitmap(pictureBox1.Image);
if (RB_contrast.Checked)
{
contrast = 0.04f * trackBar1.Value;
Bitmap bm = new Bitmap(bm_image.Width, bm_image.Height);
Graphics g = Graphics.FromImage(bm);
ImageAttributes ia = new ImageAttributes();
ColorMatrix cm = new ColorMatrix(new float[][]{
new float[]{contrast, 0f, 0f, 0f, 0f,},
new float[]{0f,contrast, 0f, 0f, 0f,},
new float[]{0f, 0f,contrast, 0f, 0f,},
new float[]{0f, 0f, 0f, 1f,0f},
new float[]{0.001f,0.001f,0.001f,0f,1f}});
ia.SetColorMatrix(cm);
g.DrawImage(bm_image, new Rectangle(0, 0, bm_image.Width, bm_image.Height), 0, 0, bm_image.Width, bm_image.Height, GraphicsUnit.Pixel, ia);
g.Dispose();
ia.Dispose();
pictureBox1.Image = bm;
}
if (RB_blackwhite.Checked)
{
for (int x = 0; x < bm_image.Width; x++)
{
for (int y = 0; y < bm_image.Height; y++)
{
//get the pixel from the original image
Color originalColor = bm_image.GetPixel(x, y);
//create the grayscale version of the pixel
int newg = (int)((originalColor.A * .3) + (originalColor.G * .59)
+ (originalColor.B * .11));
Color newColor = Color.FromArgb(newg, newg, newg);
bm_image.SetPixel(x, y, newColor);
}
}
pictureBox1.Image = bm_image;
}
if (RB_tint.Checked)
{
}
if (RB_noise.Checked)
{
}
}
}
}
{C}