Image Manipulation in Vb.nET

I have a picture box loaded with an image.

I want to take part of that image say a 20 square pixel region to y+10 and copy that into an Image object ( so I can do stuff with it).

Then I want to take that and overlay it on another image, and be able to move it around and stuff.


Unfortunately I have no idea how to even start in VB.NET.

How do I chop out the part of the image that I want?

Eiredrake

the graphic things in vb.net is in the system.drawing and system.drawing.drawing2d namespaces(gdi+)

www.c-sharpcorner.com
That site is C# oriented, but they have a graphics section that has a lot of sample code. Most of the graphics stuff will be the same in C# and VB.Net.

Quote:

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Originally posted by Eiredrake
I have a picture box loaded with an image.

I want to take part of that image say a 20 square pixel region to y+10 and copy that into an Image object ( so I can do stuff with it).

Then I want to take that and overlay it on another image, and be able to move it around and stuff.


Unfortunately I have no idea how to even start in VB.NET.

How do I chop out the part of the image that I want?

Eiredrake

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I dont know what you mean by overlay...but to take out a part of it and copy it to a variable... here's a sample code I wrote:

VB Code:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ' The cut-out portion will be 20 by 20 pixels
        Dim cutWidth As Integer = 20
        Dim cutHeight As Integer = 20
 
        ' Portion of the original image that is going to be cut out
        Dim srcRect As New Rectangle(50, 50, cutWidth, cutheight)
        Dim destRect As New Rectangle(0, 0, cutWidth, cutHeight)
        ' Saves the part of the image what will be cut out
        Dim bmpSelection As New Bitmap(cutWidth, cutHeight)
        Dim gr As Graphics = Graphics.FromImage(bmpSelection)
        ' The rectangle represents the part of the picture that you want to cut out
 
        gr.DrawImage(picSrc.Image, destRect, srcRect, GraphicsUnit.Pixel)
        ' bmpSelection contains the cutout now...
 
 
        ' Do this if you want to replace the cutout with a blank rectangle
        Dim myBrush As New SolidBrush(picSrc.BackColor)
        gr = Graphics.FromImage(picSrc.Image)
        gr.FillRectangle(myBrush, srcRect)
        picSrc.Invalidate(srcRect)
 
 
        gr.Dispose()
 
        picTest.Image = bmpSelection
    End Sub

make a windows app project and put two picboxes in it with a button. Name a picturebox "picSrc" and put the original image in it. Rename the other picturebox to "picTest"