Actually the background I use to add borders is totally homemade with Photoshop.
I don't how to calculate the angle,but what I know is :
- a card is (2 + 15/32 inch)
X (3 + 7/16 inch)
- to fit exactly with CCGHQ team pictures, the picture with borders, must be 510 pixels
X 713 pixels (image resolution 600ppi)
- at this image resolution,if you look at the picture without any zoom,the perfect angle is given by eraser tool size 50 pixels.
I tried to explain clearly but my english is weak.