1. Open ps sequentially open the image "image size, the size of the recorded case sprite;
This background sprite proportionally scaled to half its original width and height, the size of the sprite recorded at this time scale.
2. The page should be displayed is a scaled picture, open f8 find it coordinates the xy coordinates scaled as background positioning coordinates
3.bg-size width is the width of the scaled .
This completes the wizard twice the scale, if it is three times the size of the original image can be divided by three.