This tutorial is quite simple but has some tricks. I made a photo of medusa and wanted to make it blueish, glowing and more unreal. (medusas are unreal creatures by themselves!)

Here is my original photo. Lets keep it as is for a while.

Create new document, fill it with blue gradient.

Add new layer, and with very large white brush, put a spot on top of picture.

Apply some blur to this layer, and change its opacity to Soft light or Overlay.

Here is the medusa photo again. I want to get rid of colors (make picture black and white) and the best way for this particular photo is copying information from a channel. Open channels tab, and select the channel that contains best black and white picture (in my case, it was Red).

Copy image (Ctrl-A, Ctrl-C) from Red channel to RGB channel. And that's where the trick starts! Watch the shortcuts:

Ctrl-A, Ctrl-C (copy black and white image)
Q, Ctrl-V, Q (paste into mask)
Ctrl-Shift-I (invert selection)
Del - remove selection
Ctrl-U, Lightness = +100 - make all image white.

What we just did? We took black/white image, and converted all black color to transparency (leaving only white).

copy this image to previously designed background.

Duplicate layer with medusa and blur it (say, 8-10 pixels).

And last step - change blend mode of layer with Medusa to Overlay, and blend mode of layer with blurred medusa to Soft Light.
That's all! :-)

Click to see wallpaper

Author: Vlad Gerasimov