Weird White Outline Around C# Images

Question

I am using an ImageList in C# to display images on buttons dynamically. When I set the image index, it displays the image like so:

Here is the same image in Photoshop:

Answer 1

To anyone else who has this problem,

Open all the images in an image editor and replace transparency with something like (255, 0, 255) and in Visual Studio set "Transparency Color" to (255, 0, 255).

Answer 2

I had same problem using image with transparent background. Setting appropriate color depth solved the issue.

imageList.ColorDepth = ColorDepth.Depth32Bit;