My photo starts from the upper left corner and covers about 1/2 the page in both directions. I want to fade it in from the right at the top and also from the left at the bottom, but at different rates of fading, distance and shape. Can I accomplish that at one time? Or, do I need to apply one transparency save it as a separate bitmap and then apply the second transparency?
Might try overlaying a lens at each corner.
Create two white triangles at either corner of the image. Use the transparency tool to "fade" each triangle as desired.
Edit in PhotoPaint
Here's an example with a gradual fade up from the bottom and a tighter fade around the head.