How to change black to white

Blending Option is best for changing colors of your Image If the background is transperant.

with the help of blending options you could change the color of image or icon into any color

Steps:

1. Double click or right click on your layer and select blending options. A layer style popup will open.
2. From the Layer style menu Select Color overlay and pick your color. Smart and easy.

-CTRL+Backspace fills the background with main color, Alt+Backspace - Additional color

Ctrl+i or Cmd+i is the quickest way to do it. It just inverts all black pixels to white. It will also switch other colors to their complementary.