VB.NET Find a Pixel Color of an Image - vb.net

Question

How Can I find the HEX color of a specific image pixel? I've Tried This:
Private Sub PictureBox1_MouseMove(sender As Object, e As MouseEventArgs) Handles PictureBox1.MouseMove
PictureBox1.Image = Image.FromFile("c:\image.jpg")
PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage
Dim b As Bitmap = Me.PictureBox1.Image
Dim ver As String = b.GetPixel(e.X, e.Y).ToString
Dim veri As String = Hex(b.GetPixel(e.X, e.Y).ToArgb)
End Sub
This doesn't work as expected:
Private Sub PictureBox1_MouseMove(sender As Object, e As MouseEventArgs) Handles PictureBox1.MouseMove
PictureBox1.Image = My.Resources.MyImage
PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage
Dim b As Bitmap = Me.PictureBox1.Image 'b is not streched..?
Dim ver As String = b.GetPixel(e.X, e.Y).ToString
Dim veri As String = Hex(b.GetPixel(e.X, e.Y).ToArgb)
End Sub
How can I fix this?

Answer 1

I'll post this as an answer because I want to post some code. You seem to be under the impression that setting the SizeMode of a PictureBox does/should affect the Image it contains. It doesn't and it shouldn't. That property is for the UI only, i.e. it affects what the user sees but has no effect on the data. To prove that to yourself, try creating a WinForms app with two PictureBoxes and two Buttons and add this code:
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
PictureBox1.Image = Image.FromFile("image file path here")
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
If PictureBox1.SizeMode = PictureBoxSizeMode.Normal Then
PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage
Else
PictureBox1.SizeMode = PictureBoxSizeMode.Normal
End If
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
PictureBox2.Image = PictureBox1.Image
MessageBox.Show(PictureBox2.Image.Size.ToString())
End Sub
You can set the image path to any file you want.
If you click Button2 you'll see the same image appear in PictureBox2 as in PictureBox1 and the dimensions will be displayed. If you click Button1 you'll see the image in PictureBox1 change dimensions to fit the control. If you click Button2 again, what you see in PictureBox2 won't change and neither will the dimensions displayed, because the Image object hasn't changed.
If you want to get the colour of the pixel under the mouse cursor then you'd need to call DrawToBitmap on the control itself to get a Bitmap of what's actually displayed on the screen.