Converting a Bitmap to Have a Transparent Background

Environment: .NET Beta 2

This article tells you how to make a bitmap of a picturebox with transparent background

If you search for a transparent method in the picturebox clas, you will see that the method do not exist. So there must be another way to make the background of a bitmap transparent. Have a look in the bitmap class and you will find a transparent method "MakeTransparent". You must first convert your image to a bitmap and then select the background (transparent) color. After that, make the background color transparent and finally convert it back to the image of the control.

Example code:

1) Convert your image to a bitmap

Bitmap Logo = new Bitmap(CompanyLogo.Image);

2) select the background color (here the left top pixel) and make it transparent

Logo.MakeTransparent(Logo.GetPixel(1, 1));

3) Finally convert it back to the image

CompanyLogo.Image = (Image) Logo;

That's all


  • myself

    Posted by Bill on 09/03/2014 01:01pm

    I was googling for just that - how to make a picture transparent... This method must be for "pro's". I don't even understand what program if any it refers to.

  • Works well !

    Posted by Ram on 05/26/2014 10:40pm

    Works great ! Thanks Ram

  • extract an image from a bmp image

    Posted by Legacy on 10/07/2003 12:00am

    Originally posted by: sumaira

    plz i want to know who to extract an image from a bmp image in a 2 tone colors
    interested ppl contact me

  • Problem with bitmaps

    Posted by Legacy on 01/22/2003 12:00am

    Originally posted by: Sue

    I have found when I tried this example that the bitmap never unlocks the resource image (and yes I am doing bitmap.Dispose(); bitmap = null;

    Anyone have any ideas?

  • Java to C#

    Posted by Legacy on 11/22/2001 12:00am

    Originally posted by: Jo

    I heard there is a tool in J# that allows you to change all your java code into C# but i can't find it...does anyone know how to?

  • short & elegant (even thou I did not check it) :o)

    Posted by Legacy on 10/29/2001 12:00am

    Originally posted by: Amit Gefen

    A kind of advices that I like -
    short & elegant. I hope to hear some readers
    reports, if it is work as fine as it simple.

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