- Magic Wand tool
- Click anywhere in the space of the background and keep on clicking until the pen is fully selected.
- view - show - grid (un tick the grid)
Go to levels and move the slider to create smooth pixels with the object and the background, 0.31 was best suited to the pen so i chose this one.
Luminosity - doesn't effect the colours of your image just the levels you want to adjust your image to.
Option key & click:
With layer only makes the adjustment to the layer below rather than doing the adjusments to all the layers you have.