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Setting Mask (Transparent) Colour in PictureBox

Posted on 2007-12-02
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Last Modified: 2012-06-21
In VB6, one could set the Mask colour of a PictureBox (or was it an ImageBox?) to make a specific colour transparent (normally this was set to the picture's background colour). I can't seem to find this property in VB 2005's PictureBox control. Any ideas?
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Question by:SETP
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Fernando Soto earned 500 total points
ID: 20392041
Hi SETP;

In VB .Net 2005 the transparent color is now part of the Bitmap image itself and not the PictureBox object. The sample code below shows hot to load a gif image into a picture box with a transparent color of red = 7, green = 15 and blue = 0 or you could use a Color.ColorName as also shown.

Fernando
        Dim bMap As Bitmap = CType(Bitmap.FromFile("C:\Temp\image001.gif"), Bitmap)
        bMap.MakeTransparent(Color.FromArgb(7, 14, 0))
        PictureBox1.Image = bMap
 
Or
 
        Dim bMap As Bitmap = CType(Bitmap.FromFile("C:\Temp\image001.gif"), Bitmap)
        bMap.MakeTransparent(Color.Yellow)
        PictureBox1.Image = bMap

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