Original http://forums.dpreview.com/forums/read.asp?forum=1006&message=7928207

1. Selected a sample overcast color (clicked on the carpet)
2. new layer > fill with that color > Inverse > 50% (Katrin Eismann technique)
3. Above gave me a place to start. I still needed individual color corrections for each affected part.
4. created 5 layers - each focussing on a specific area of color problem
5. first layer - adjusted color of floor - masked out rest (color matching via levels per channel in PS7)
6. second layer - adjusted color of curtains - masked out rest ("). Also did a color replace from green to dark blue
7. third layer - adjusted color of red car - masked out rest (")
8. fourth layer - focussed on top dome - used curves to set yellow as white point
9. fifth layer adjusted color of black(?) car - masked out rest (")
10. blended each color correction into each other using graded masks
11. ran a desat sponge on blue artifacts around cars and people
12. selected some parts of the ground and ran a de-noise filter on low