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C#开发winform去除图片水印小工具

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效果图：

思路：

1.获取图片

2.处理水印

3.保存处理的图片

代码：

获取图片：

private void button1_Click(object sender, EventArgs e)

        {

            OpenFileDialog openFileDialog = new OpenFileDialog();

            openFileDialog.Multiselect = true;

            //文件格式

            openFileDialog.Filter = "所有文件|*.*";

            //还原当前目录

            openFileDialog.RestoreDirectory = true;

            if (openFileDialog.ShowDialog() == DialogResult.OK)

            {

                string oldImgPath = openFileDialog.FileName;

                this.textBox1.Text = oldImgPath;

                this.textBox2.Text = this.textBox2.Text += "\r\n" + "图片路径：" + oldImgPath;

            }

        }

处理水印并保存：

private void button2_Click(object sender, EventArgs e)

        {

            Image oldImg = Image.FromFile(this.textBox1.Text);

            this.textBox2.Text = this.textBox2.Text += "\r\n" + "去除水印...";

            if (this.textBox3.Text == "255,255,255" || this.textBox3.Text == string.Empty)

            {

                this.textBox2.Text += "\r\n" + "请设置水印的rgb值";

                return;

            }

            string[] rgbItem = this.textBox3.Text.Split(',');

            Image newImg = imgHelper.SetImageColorAll(oldImg, Color.FromArgb(Convert.ToInt32(rgbItem[0]),Convert.ToInt32(rgbItem[1]),Convert.ToInt32(rgbItem[2])), Color.White, 20);

            this.textBox2.Text = this.textBox2.Text += "\r\n" + "去除水印成功,正在保存...";

            string savPath = this.textBox1.Text.Substring(0, this.textBox1.Text.LastIndexOf('\\'));

            if (this.textBox4.Text == "格式：文件名+.png/.jpg" || this.textBox4.Text == string.Empty)

            {

                this.textBox2.Text += "\r\n" + "未设置保存的文件名，自动保存的文件名为：cs.png";

                return;

            }

            savPath = Path.Combine(savPath,this.textBox4.Text);//合成路径

            newImg.Save(savPath);

            this.textBox2.Text = this.textBox2.Text += "\r\n" + "保存成功!";

        }<br>//处理水印类

public class imgHelper

{

public static Image SetImageColorAll(Image p_Image, Color p_OdlColor, Color p_NewColor, int p_Float)

{

int _Width = p_Image.Width;

int _Height = p_Image.Height;

Bitmap _NewBmp = new Bitmap(_Width, _Height, PixelFormat.Format32bppArgb);

Graphics _Graphics = Graphics.FromImage(_NewBmp);

_Graphics.DrawImage(p_Image, new Rectangle(0, 0, _Width, _Height));

_Graphics.Dispose();

//图片背景处理的操作

BitmapData _Data = _NewBmp.LockBits(new Rectangle(0, 0, _Width, _Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);

_Data.PixelFormat = PixelFormat.Format32bppArgb;

int _ByteSize = _Data.Stride * _Height;

byte[] _DataBytes = new byte[_ByteSize];

Marshal.Copy(_Data.Scan0, _DataBytes, 0, _ByteSize);

int _WhileCount = _Width * _Height;

int _Index = 0;

for (int i = 0; i != _WhileCount; i++)

{

Color _Color = Color.FromArgb(_DataBytes[_Index + 3], _DataBytes[_Index + 2], _DataBytes[_Index + 1], _DataBytes[_Index]);

if (ScanColor(_Color, p_OdlColor, p_Float))

{

_DataBytes[_Index + 3] = (byte)p_NewColor.A;

_DataBytes[_Index + 2] = (byte)p_NewColor.R;

_DataBytes[_Index + 1] = (byte)p_NewColor.G;

_DataBytes[_Index] = (byte)p_NewColor.B;

}

_Index += 4;

}

Marshal.Copy(_DataBytes, 0, _Data.Scan0, _ByteSize);

_NewBmp.UnlockBits(_Data);

return _NewBmp;

}

private static bool ScanColor(Color p_CurrentlyColor, Color p_CompareColor, int p_Float)

{

int _R = p_CurrentlyColor.R;

int _G = p_CurrentlyColor.G;

int _B = p_CurrentlyColor.B;

return (_R <= p_CompareColor.R + p_Float && _R >= p_CompareColor.R - p_Float) && (_G <= p_CompareColor.G + p_Float && _G >= p_CompareColor.G - p_Float) && (_B <= p_CompareColor.B + p_Float && _B >= p_CompareColor.B - p_Float);

}

}