Saved GIF image is grainy...why?

Hello,

I can save a bitmap, jpeg, and tiff file with no problems, but when I save a GIF file it turns out grainy. Why? This is the code used to save the file.


If saveFile.FileName.EndsWith("bmp") Then
Pic.Save(saveFile.FileName, Imaging.ImageFormat.Bmp)
ElseIf saveFile.FileName.EndsWith("gif") Then
Pic.Save(saveFile.FileName, Imaging.ImageFormat.Gif)
ElseIf saveFile.FileName.EndsWith("tiff") Then
Pic.Save(saveFile.FileName, Imaging.ImageFormat.Tiff)
ElseIf saveFile.FileName.EndsWith("jpg") Then
Pic.Save(saveFile.FileName, ici, ep)
End If

Not sure why but I've just tried it and it does save without problems (quality isn't that perfect but this isn't a problem). Did you try this with different pictures with different resolutions ?

these 2 articles ( one in vb.net / one in C# ) both explain the reason / a way of saving gifs without 2 much trouble ...
HOW TO: Save a .gif File with a New Color Table By Using Visual Basic .NET
HOW TO: Save a .gif File with a New Color Table By Using Visual C# .NET