BMP saved but not reloading

[old banshee]

I created an image and saved it as a png I also saved it as an 8bit bmp. When I try to load it I get the following message. I is a large file 900 mb.

Any ideas?

System.ArgumentException: Parameter is not valid.

   at System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement, Boolean validateImageData)

   at PaintDotNet.Data.BmpFileType.OnLoad(Stream input) in D:\src\pdn\src\PaintDotNet\Data\BmpFileType.cs:line 95

   at PaintDotNet.FileType.Load(Stream input) in D:\src\pdn\src\Data\FileType.cs:line 496

   at PaintDotNet.Functional.Func.Eval[T1,TRet](Func`2 f, T1 arg1) in D:\src\pdn\src\Base\Functional\Func.cs:line 158

 

Frank