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Image manipulation in ASP.NET

Posted on 2004-08-16
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Last Modified: 2006-11-17
I want to slice up GIF images by specifying a set of pixel coordinates and saving the referenced portion of the image to a new GIF file. How do I do this?
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Question by:crescendo
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tovvenki earned 250 total points
ID: 11817830
Hi,
check whether the following paq helps you
http://www.experts-exchange.com/Programming/Programming_Languages/C_Sharp/Q_20664097.html?query=cut+image+&clearTAFilter=true
the accepted solution from xls is
// System.Drawing;

Bitmap original = new Image("file.jpg");
Bitmap newBitmap= new Bitmap(1024,768, PixelFormatFlags32Argb);
newBitmap.DrawImage()... // use any of the methods that you like..
newBitmap.Save("cutimage.jpg");

Hope that this helps you

regards,
venki
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Author Comment

by:crescendo
ID: 11818924
Thanks, venki.

It gave me enough to understand how to do what I wanted. If anyone is interested, the code below takes an image and creates a sliced image. The Slice function does this, allowing you to specify the coordonates and dimensions of the slice. The Button1 click routine at the bottom calls Slice and saves and displays the result.

A word of caution, the colours in the slice differ slightly from the orginal, they look dithered, and I'm looking into this.

- crescendo


    Private Function Slice(ByVal imgPhoto As Image, ByVal FromX As Integer, ByVal FromY As Integer, _
    ByVal nWidth As Integer, ByVal nHeight As Integer) As Image

        Dim bmPhoto As Bitmap = New Bitmap(nWidth, nHeight, PixelFormat.Format24bppRgb)
        bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution)

        Dim grPhoto As Graphics = Graphics.FromImage(bmPhoto)
        grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic

        Dim rectSlice As Rectangle = New Rectangle
        rectSlice.X = FromX
        rectSlice.Y = FromY
        rectSlice.Height = nHeight
        rectSlice.Width = nWidth

        grPhoto.DrawImage(imgPhoto, 0, 0, rectSlice, GraphicsUnit.Pixel)
        grPhoto.Dispose()
        Return bmPhoto

    End Function

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim WorkingDirectory As String = Server.MapPath("images/test") + "\"
        Dim imgPhoto As Image = Image.FromFile(WorkingDirectory + "bluecallout.gif")
        Dim imgSlice As Image = Slice(imgPhoto, 0, 0, 150, 40)
        imgSlice.Save(WorkingDirectory + "top.gif", ImageFormat.Gif)

        imgTop.ImageUrl = "images/test/top.gif"
    End Sub
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