using Aspose.Imaging;
using Aspose.Imaging.FileFormats.Bmp;
using Aspose.Imaging.ImageOptions;
using Aspose.Imaging.Sources;
using System.IO;

string templatesFolder = @"c:\Users\USER\Downloads\templates\";
string dataDir = templatesFolder;

using (FileStream fs = File.OpenRead(dataDir + "template.bmp"))
{
    using (BmpImage image = (BmpImage)Image.Load(fs))
    {

    }
}