请教如何改变一个图片的色相和饱和度？改变后保存下来，谢谢

[billgateslover]

请教如何改变一个图片的色相(PS里面的色相)和饱和度(PS里面的饱和度)？改变后保存下来，谢谢

比如:

System.Drawing.Image Image;
Image = System.Drawing.Image.FromFile(TempPath);

如何设置它的饱和度和色相，然后保存下来？

希望能给一段可用的代码


下面这段代码可以实现变灰度，但色相和饱和度不知道要怎么换算来做，特请教：

    protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            String stPath = Request.QueryString["path"].Trim();
            int width = int.Parse(Request.QueryString["width"]);
            int height = int.Parse(Request.QueryString["height"]);
            string ImagePath = stPath;
            string TempPath = Server.MapPath(ImagePath);
            float SourceWidth = 0f, SourceHeght = 0f, NewWidth = 0f, NewHeight = 0f;
            System.Drawing.Image Image;
            Image = System.Drawing.Image.FromFile(TempPath);
            SourceWidth = Image.Width;
            SourceHeght = Image.Height;
            float Width = float.Parse(width.ToString());
            float Height = float.Parse(height.ToString());
            if (SourceWidth <= Width && SourceHeght <= Height)
            {
                NewWidth = SourceWidth;
                NewHeight = SourceHeght;
            }
            else if (Width > 0f && Height == 0f)
            {
                NewWidth = Width;
                NewHeight = NewWidth * SourceHeght / SourceWidth;
            }
            else if (Width == 0f && Height > 0f)
            {
                NewHeight = Height;
                NewWidth = NewHeight * SourceWidth / SourceHeght;
            }
            else if (SourceWidth >= Width || SourceHeght >= Height)
            {
                if ((SourceWidth / SourceHeght) > (Width / Height))
                {
                    NewWidth = Width;
                    NewHeight = SourceHeght * NewWidth / SourceWidth;
                }
                else
                {
                    NewHeight = Height;
                    NewWidth = SourceWidth * NewHeight / SourceHeght;
                }
            }
            if (NewWidth == 0f) NewWidth = 1f;
            if (NewHeight == 0f) NewHeight = 1f;














            Bitmap drawBasic = new Bitmap(Convert.ToInt32(NewWidth), Convert.ToInt32(NewHeight), PixelFormat.Format64bppArgb);
            Graphics g = Graphics.FromImage(drawBasic);
            g.DrawImage(Image, 0, 0, NewWidth, NewHeight);
            //g.DrawImage(frameImage, 0, 0, frameImage.Width, frameImage.Height);
            //g.FillRectangle(new SolidBrush(Color.FromArgb(80, Color.Yellow)), new Rectangle(0, 0, Convert.ToInt32(NewWidth), Convert.ToInt32(NewHeight)));
            g.Save();


            int Height1 = Convert.ToInt32(NewHeight);
            int Width1 = Convert.ToInt32(NewWidth);
            Bitmap bitmap = new Bitmap(Width1, Height1);
            Bitmap MyBitmap = drawBasic;

            Color pixel;
            for (int x = 0; x < Width1; x++)
                for (int y = 0; y < Height1; y++)
                {
                    pixel = MyBitmap.GetPixel(x, y);
                    int r, sg, b, Result = 0;
                    r = pixel.R;
                    sg = pixel.G;
                    b = pixel.B;
                    //实例程序以加权平均值法产生黑白图像   
                    int iType = 2;
                    //int iType = 0;
                    switch (iType)
                    {
                        case 0://平均值法   
                            Result = ((r + sg + b) / 3);
                            break;
                        case 1://最大值法   
                            Result = r > sg ? r : sg;
                            Result = Result > b ? Result : b;
                            break;
                        case 2://加权平均值法   
                            Result = ((int)(0.7 * r) + (int)(0.2 * sg) + (int)(0.1 * b));
                            //Result = ((int)(0.6 * r) + (int)(0.3 * sg) + (int)(0.2 * b));

                            break;
                    }
                    bitmap.SetPixel(x, y, Color.FromArgb(Result, Result, Result));
                    //bitmap.SetPixel(x, y, Color.FromArgb(255 - r, 255 - sg, 255 - b));
                }
           
           

            MemoryStream ms = new MemoryStream();
            bitmap.Save(ms, ImageFormat.Jpeg);
            //drawBasic.Save(ms, ImageFormat.Jpeg);
            Response.Clear();
            Response.ContentType = "image/jpeg";
            Response.BinaryWrite(ms.ToArray());
            ms.Dispose();
            g.Dispose();
            drawBasic.Dispose();
            Image.Dispose();

        }
        catch(Exception ex)
        {
            throw new Exception(ex.Message);
            Response.Write("deny request");
            Response.End();
        }
    }
    public bool ThumbnailCallback()
    {
        return false;
    }

[billgateslover]

小弟在线等啊

[gomoku]

网上rgb到hsi(Hue Saturation Intensity)的转换代码很容易找到。
把颜色空间换到HSI上，调整色泽H，饱和度S就一目了然了。

[billgateslover]

具体要用什么类，怎么操作呀？感谢

[billgateslover]

问题解决了，在网上抄了一个，贴上来分析

Imports System.Drawing
Imports System.Drawing.Imaging

Public Class HSLFilter
    Inherits BasicFilter

    Private _hue As Double = 0.0
    Private _saturation As Double = 0.0
    Private _lightness As Double = 0.0

    ''' <summary>
    ''' Get or set hue correction value.
    ''' </summary>
    ''' <value>Any double, will be scaled to range [0..360).</value>
    ''' <returns>Double in range [0..360).</returns>
    Public Property Hue() As Double
        Get
            Return _hue
        End Get
        Set(ByVal value As Double)
            _hue = value
            Do While _hue < 0.0
                _hue += 360
            Loop
            Do While _hue >= 360.0
                _hue -= 360
            Loop
        End Set
    End Property

    ''' <summary>
    ''' Get or set saturation correction value.
    ''' </summary>
    ''' <value>Double in range [-100..+100]%.</value>
    ''' <returns>Double in range [-100..+100]%.</returns>
    ''' <remarks></remarks>
    Public Property Saturation() As Double
        Get
            Return _saturation
        End Get
        Set(ByVal value As Double)
            If ((value >= -100.0) And (value <= 100.0)) Then
                _saturation = value
            End If
        End Set
    End Property

    ''' <summary>
    ''' Get or set lightness correction value.
    ''' </summary>
    ''' <value>Double in range [-100..+100]%.</value>
    ''' <returns>Double in range [-100..+100]%.</returns>
    ''' <remarks></remarks>
    Public Property Lightness() As Double
        Get
            Return _lightness
        End Get
        Set(ByVal value As Double)
            If ((value >= -100.0) And (value <= 100.0)) Then
                _lightness = value
            End If
        End Set
    End Property

    ''' <summary>
    ''' Execute filter and return filtered image.
    ''' </summary>
    ''' <param name="img"></param>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Public Overrides Function ExecuteFilter(ByVal img As System.Drawing.Image) As System.Drawing.Image
        Select Case img.PixelFormat
            Case PixelFormat.Format16bppGrayScale
                Return img
            Case PixelFormat.Format24bppRgb, _
                     PixelFormat.Format32bppArgb, PixelFormat.Format32bppRgb
                Return ExecuteRgb8(img)
            Case PixelFormat.Format48bppRgb
                Return img
            Case Else
                Return img
        End Select
    End Function

    ''' <summary>
    ''' Execute filter on (A)RGB image with 8 bits per color.
    ''' </summary>
    ''' <param name="img"></param>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Private Function ExecuteRgb8(ByVal img As System.Drawing.Image) As System.Drawing.Image
        Const c1o60 As Double = 1 / 60
        Const c1o255 As Double = 1 / 255
        Dim result As Bitmap = New Bitmap(img)
        result.SetResolution(img.HorizontalResolution, img.VerticalResolution)
        Dim bmpData As BitmapData = result.LockBits( _
                       New Rectangle(0, 0, result.Width, result.Height), _
                       ImageLockMode.ReadWrite, img.PixelFormat)
        Dim pixelBytes As Integer = _
                 System.Drawing.Image.GetPixelFormatSize(img.PixelFormat) \ 8
        'Get the address of the first line.
        Dim ptr As IntPtr = bmpData.Scan0
        Dim size As Integer = bmpData.Stride * result.Height
        Dim pixels(size - 1) As Byte
        Dim index As Integer
        Dim R, G, B As Double
        Dim H, S, L, H1 As Double
        Dim min, max, dif, sum As Double
        Dim f1, f2 As Double
        Dim v1, v2, v3 As Double
        Dim sat As Double = 127 * _saturation / 100
        Dim lum As Double = 127 * _lightness / 100
        'Copy the RGB values into the array.
        System.Runtime.InteropServices.Marshal.Copy(ptr, pixels, 0, size)
        'Main loop.
        For row As Integer = 0 To result.Height - 1
            For col As Integer = 0 To result.Width - 1
                index = (row * bmpData.Stride) + (col * pixelBytes)
                R = pixels(index + 2)
                G = pixels(index + 1)
                B = pixels(index + 0)
                'Conversion to HSL space.
                min = R
                If (G < min) Then min = G
                If (B < min) Then min = B
                max = R : f1 = 0.0 : f2 = G - B
                If (G > max) Then
                    max = G : f1 = 120.0 : f2 = B - R
                End If
                If (B > max) Then
                    max = B : f1 = 240.0 : f2 = R - G
                End If
                dif = max - min
                sum = max + min
                L = 0.5 * sum
                If (dif = 0) Then
                    H = 0.0 : S = 0.0
                Else
                    If (L < 127.5) Then
                        S = 255.0 * dif / sum
                    Else
                        S = 255.0 * dif / (510.0 - sum)
                    End If
                    H = (f1 + 60.0 * f2 / dif)
                    If H < 0.0 Then H += 360.0
                    If H >= 360.0 Then H -= 360.0
                End If
                'Apply transformation.
                H = H + _hue
                If H >= 360.0 Then H = H - 360.0
                S = S + sat
                If S < 0.0 Then S = 0.0
                If S > 255.0 Then S = 255.0
                L = L + lum
                If L < 0.0 Then L = 0.0
                If L > 255.0 Then L = 255.0
                'Conversion back to RGB space.
                If (S = 0) Then
                    R = L : G = L : B = L
                Else
                    If (L < 127.5) Then
                        v2 = c1o255 * L * (255 + S)
                    Else
                        v2 = L + S - c1o255 * S * L
                    End If
                    v1 = 2 * L - v2
                    v3 = v2 - v1
                    H1 = H + 120.0
                    If (H1 >= 360.0) Then H1 -= 360.0
                    If (H1 < 60.0) Then
                        R = v1 + v3 * H1 * c1o60
                    ElseIf (H1 < 180.0) Then
                        R = v2
                    ElseIf (H1 < 240.0) Then
                        R = v1 + v3 * (4 - H1 * c1o60)
                    Else
                        R = v1
                    End If
                    H1 = H
                    If (H1 < 60.0) Then
                        G = v1 + v3 * H1 * c1o60
                    ElseIf (H1 < 180.0) Then
                        G = v2
                    ElseIf (H1 < 240.0) Then
                        G = v1 + v3 * (4 - H1 * c1o60)
                    Else
                        G = v1
                    End If
                    H1 = H - 120.0
                    If (H1 < 0.0) Then H1 += 360.0
                    If (H1 < 60.0) Then
                        B = v1 + v3 * H1 * c1o60
                    ElseIf (H1 < 180.0) Then
                        B = v2
                    ElseIf (H1 < 240.0) Then
                        B = v1 + v3 * (4 - H1 * c1o60)
                    Else
                        B = v1
                    End If
                End If
                'Save new values.
                pixels(index + 2) = CByte(R)
                pixels(index + 1) = CByte(G)
                pixels(index + 0) = CByte(B)
            Next
        Next
        'Copy the RGB values back to the bitmap
        System.Runtime.InteropServices.Marshal.Copy(pixels, 0, ptr, size)
        'Unlock the bits.
        result.UnlockBits(bmpData)
        Return result
    End Function

End Class

[billgateslover]

Imports System.Drawing
Imports System.Drawing.Drawing2D

Public Class ResizeFilter
    Inherits BasicFilter

    ''' <summary>
    ''' Width of new image.
    ''' </summary>
    Private _width As Integer = 0
    ''' <summary>
    ''' Height of new image.
    ''' </summary>
    Private _height As Integer = 0

    ''' <summary>
    ''' Get or set output image width.
    ''' </summary>
    Public Property Width() As Integer
        Get
            Return _width
        End Get
        Set(ByVal value As Integer)
            _width = value
        End Set
    End Property

    ''' <summary>
    ''' Get or set output image height.
    ''' </summary>
    Public Property Height() As Integer
        Get
            Return _height
        End Get
        Set(ByVal value As Integer)
            _height = value
        End Set
    End Property

    ''' <summary>
    ''' Execute resize of given image.
    ''' </summary>
    ''' <param name="img">Image to be resized.</param>
    ''' <returns>Resized image.</returns>
    Public Overrides Function ExecuteFilter(ByVal img As System.Drawing.Image) As System.Drawing.Image
        If ((img.Width <= 0) Or (img.Height <= 0) Or _
                 (_width <= 0) Or (_height <= 0)) Then
            Return img
        End If
        Dim result As Bitmap = New Bitmap(_width, _height)
        Dim g As Graphics = Graphics.FromImage(result)
        g.InterpolationMode = Interpolation
        g.DrawImage(img, 0, 0, _width, _height)
        Return result
    End Function

End Class

[laichunlin]

谢谢 分享 受益了！

[billgateslover]

昨晚不能一次性贴完

Imports System.Drawing
Imports System.Drawing.Drawing2D

Public Interface IFilter

    Function ExecuteFilter( _
             ByVal inputImage As System.Drawing.Image) As System.Drawing.Image

End Interface

Public MustInherit Class BasicFilter
    Implements IFilter

    ''' <summary>
    ''' Background color. Default is a transparent background.
    ''' </summary>
    Private _bgColor As Color = Color.FromArgb(0, 0, 0, 0)
    ''' <summary>
    ''' Interpolation mode. Default is highest quality.
    ''' </summary>
    Private _interpolation As InterpolationMode = _
             InterpolationMode.HighQualityBicubic

    ''' <summary>
    ''' Get or set background color.
    ''' </summary>
    Public Property BackgroundColor() As Color
        Get
            Return _bgColor
        End Get
        Set(ByVal value As Color)
            _bgColor = value
        End Set
    End Property

    ''' <summary>
    ''' Get or set resize interpolation mode.
    ''' </summary>
    Public Property Interpolation() As InterpolationMode
        Get
            Return _interpolation
        End Get
        Set(ByVal value As InterpolationMode)
            _interpolation = value
        End Set
    End Property

    ''' <summary>
    ''' Execute filter function and return new filtered image.
    ''' </summary>
    ''' <param name="img">Image to be filtered.</param>
    ''' <returns>New filtered image.</returns>
    Public MustOverride Function ExecuteFilter( _
             ByVal img As System.Drawing.Image) _
             As System.Drawing.Image Implements IFilter.ExecuteFilter

End Class

[billgateslover]

调用页面：

Imports System.Drawing
Imports System.Drawing.Imaging
Partial Class _makepic
    Inherits System.Web.UI.Page
    Private _imgOriginal As Image
    Private _imgFiltered As Image
    Private _imgResized As Image
    Private _filterHSL As HSLFilter = New HSLFilter
    Public Shared Function GetEncoderInfo(ByVal format As ImageFormat) As ImageCodecInfo
        Dim j As Integer
        Dim encoders() As ImageCodecInfo
        encoders = ImageCodecInfo.GetImageEncoders()
        j = 0
        While j < encoders.Length
            If encoders(j).FormatID = format.Guid Then
                Return encoders(j)
            End If
            j += 1
        End While
        Return Nothing
    End Function

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim picpath As String
        picpath = Server.MapPath(Session("picpath"))
        If picpath = Server.MapPath(".") Then Response.Redirect("ip.aspx")
        _imgOriginal = Image.FromFile(picpath)
        Dim scale As Double = 1
        If (_imgOriginal.Width > 280) Or (_imgOriginal.Height > 210) Then
            scale = System.Math.Min(280 / _imgOriginal.Width, 210 / _imgOriginal.Height)
        End If
        Dim imgFilter As ResizeFilter = New ResizeFilter
        imgFilter.Width = CInt(scale * _imgOriginal.Width)
        imgFilter.Height = CInt(scale * _imgOriginal.Height)
        _imgResized = imgFilter.ExecuteFilter(_imgOriginal)
        ' pnlOriginal.BackgroundImage = _imgResized
        'pnlFiltered.BackgroundImage = _imgResized
        Dim sliderH, sliderS, sliderL As Double
        sliderH = Request.QueryString("sliderH").ToString
        sliderS = Request.QueryString("sliderS").ToString
        sliderL = Request.QueryString("sliderL").ToString

        _filterHSL.Hue = CDbl(sliderH)
        _filterHSL.ExecuteFilter(_imgResized)
        _filterHSL.Saturation = CDbl(sliderS)
        _filterHSL.ExecuteFilter(_imgResized)
        _filterHSL.Lightness = CDbl(sliderL)
        _filterHSL.ExecuteFilter(_imgResized)
        Dim ext As String = Mid(picpath, picpath.LastIndexOf(".") + 2)
        Dim myEncoderParameters As EncoderParameters = Nothing
        Dim myImageCodecInfo As ImageCodecInfo
        Select Case ext.ToLower()
            Case "jpg"
                myImageCodecInfo = GetEncoderInfo(ImageFormat.Jpeg)
                myEncoderParameters = New EncoderParameters(1)
                myEncoderParameters.Param(0) = New EncoderParameter(Encoder.Quality, CType(90L, Int32))
            Case "gif"
                myImageCodecInfo = GetEncoderInfo(ImageFormat.Gif)
            Case "png"
                myImageCodecInfo = GetEncoderInfo(ImageFormat.Png)
            Case "bmp"
                myImageCodecInfo = GetEncoderInfo(ImageFormat.Bmp)
            Case Else
                Response.Write("Image format " & ext & " is not suported!")
                Exit Sub
        End Select
        If Request("scale") = "small" Then
            _imgFiltered = _filterHSL.ExecuteFilter(_imgResized)
        Else
            imgFilter.Width = _imgOriginal.Width
            imgFilter.Height = _imgOriginal.Height
            _imgOriginal = imgFilter.ExecuteFilter(_imgOriginal)
            _imgFiltered = _filterHSL.ExecuteFilter(_imgOriginal)
        End If
        _imgFiltered.Save(Response.OutputStream, GetEncoderInfo(ImageFormat.Jpeg), myEncoderParameters)
    End Sub
End Class