Make in photoshop elements
This should be translateable
uses only:
levels and hue/saturation
Go from
to
Starting with your base image resize and sharpen you image
Layers>>new adjustment layer>>levels
RGB
Input 8 1.30 219
output 0 255
RED
Input 51 2.49 213
Output 0 255
GREEN
Input 12 1.00 255
Output 8 253
BLUE
INPUT 0 1.30 255
OUTPUT 15 239
Layers>> new adjustment layer>> hue/saturation
saturation +21
Merge visible layers
you should get something like this
if you want to have the black background just create a new layer, fill it with #000000
then resize your image of ron and hermione and place it in the middle, and drag it to the top.