Keep Luminosity with invert!

We all know the invert function of Photoshop, easy and nice (well nor always but will fix this) to invert all colors.... The downside is than this trick will also invert luminosity... Light area become dark and dark area become light, this can ruin an image!

If you wish to invert an image and keep lighting intact the trick is really simple!

1) Open an image to be inverted
2) Duplicate you background layer (or the image layer), this layer will be used as a luminosity mask.
3) Select your original layer
4) Invert you original layer
5 (Optional) Link and Merge these layers

Done!

Trick : If you invert the luminosity(the copy of the original) rather the than original layer, you will inver the lighting of the image... Its also pretty cool!

Easier way:
1) Make an adjustment layer - Invert above all of your other layers, then set it's blending mode to colour.

Both nice tips......