Hello, @aabuhijleh!
Thank you for your interest in Aspose.Imaging.
As noticed on the given web page, Aspose.Imaging only provides saving to PSD ability.
For loading, you should use Aspose.PSD library.
The difference is simple.
Most image formats can be read by Aspose.Images and can also be exported to them.
But some of them are partially supported, for example, PSD is a format that can only be exported to.