This was the first time I'd tried to use Nuke and I really learnt a lot! I rendered some passes as 32bit floating point openEXR (beauty, zDepth) to have more freedom and the rest as 8bit iff.
Nuke gives you the possibility of creating new channels from images, so I used the colorID passes to put new channels into the pipe in order to be able to select the various objects with just one click through the whole script. This was especially useful while doing color correction. Height passes and the light fog helped me to improve the atmosphere while the vignetting allowed me to concentrate the attention on the car, which was supposed to be the most important spot of the image. In Fig.05a you can see a screenshot of the whole script with some explanations!
I'm really happy about writing this tutorial and sharing what I've learnt with you! I think that this has been a little like a production workflow because we had to get feedback from each other by mail ... sending progresses and trying to understand each other just by reading. Maybe if we had been able to work side by side we wouldn't have done all those tests, but I think that this has been a nice research piece and I'm just looking forward to starting a new project,
If you have any questions, feel free to write to me!