// Load raw image into memory
FileIn fin(IMAGE_FILE_PATH);
if (!fin.IsOpen()) 
	{ Exclamation("Unable to open file"); return; }
String raw = fin.Get((dword)fin.GetSize());

// Convert String to uncompressed Image
Image img = StreamRaster::LoadStringAny(raw);
// If you know the image format you could also use:
// Image img = JPGRaster().LoadString(raw);
if (IsNull(img)) 
	{ Exclamation("Unknown/Bad image format"); return; }

// If you need to modify the image use an ImageBuffer
ImageBuffer ib(img);
for (int row = 0; row < ib.GetHeight(); ++row) {
	RGBA *rowData = ib[row];
	for(int col = 0; col < ib.GetWidth(); col++) {
		rowData[col].red   = 255-rowData[col].red; // Inverting the colors
		rowData[col].green = 255-rowData[col].green;
		rowData[col].blue  = 255-rowData[col].blue;
	}
}
img = ib;