Transforming a day time image to night time.

Transformation and breakdown

Screen Shot 2015-10-05 at 13.17.32
This is the image we were given at the beginning of lesson to work on further over the weekend. You can see there is a Gamma node attached in order to manipulate the mid tones of the images colour. Previous to adding this colour node in place the image was washed out.
Screen Shot 2015-10-05 at 13.17.07
This is the stage I got up to in class, I want to go back a couple of steps so I can understand fully why we did each step. The good thing about Nuke is that we can go upstream to understand each task. The ultimate goal is to turn this scene into a night scene.

What do we need to do in order to get this image into a night image?

I want to take a little time analysing existing photographs of buildings at night firstly – because after all this project is about creating photorealistic, integration. I am new to using nuke analysing these images will allow me to see how I could go about tackling this task.

Screen Shot 2015-10-05 at 17.26.20
How are we going to turn this?

Screen Shot 2015-10-05 at 17.44.35
Into this? [Mood board – selection of night skies]
Increase contrast, reduce white colour, increase dark matter, reduce wash out, insert a sky either by rotoscoping etc. Maybe add lights to the window -experiment with this.

Potential sky backgrounds editing in: 1600 x 1200 

                                                             1600 x 1200

Screen Shot 2015-10-05 at 20.34.10 1600 x 1200    1600 x 1200

Screen Shot 2015-10-06 at 12.54.00
After using the keyer there was some excess white and dark areas. I decided to roto these aspects out.
Screen Shot 2015-10-06 at 13.00.22
When I added the background in place of the checkerboard it distorted the format and cut of the building to the right. Even when I made sure the format was correct, it stayed the same.
Screen Shot 2015-10-06 at 13.08.47
troubleshooting: I corrected this by adding in a reformat node which ensured that the size of the image remains the same.

Screen Shot 2015-10-06 at 13.31.18

Choosing a sky.

Screen Shot 2015-10-06 at 14.30.33
A (In this image above you can still see some light from the front I decided to turn the contrast up slightly which you can see the below two have)

Screen Shot 2015-10-06 at 14.00.43

Screen Shot 2015-10-06 at 13.59.15


Above is the potential skies I could have used. I went with  the middle sky. (b) 

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too much contrast
Screen Shot 2015-10-06 at 16.21.12
2.06* in contrast (note)
Screen Shot 2015-10-06 at 17.16.42
Good inbetween

Why I chose to do the sky with no moon* 

Analysing the original photo and the above edits in progress you can see that light is reflecting in the windows. I feel it would be perhaps better to imply the moon is in front of the building and slightly edit the colours of the window. The moon does create a more atmospheric piece however.

Things I need to do next:

Dulling out the white bottom right, dull windows

To do this I will need to use the roto node, however I think I need to research more into this node as I am having a little trouble with it.

*Final update – I did have trouble with the Roto but I discovered where I went wrong meaning I was able to take some of the blue away in the reflection of the glass. This was something which was spoiling the night illusion in my eyes. Above is my final conclusion. 

Recap of the final comparison

Screen Shot 2015-10-06 at 23.37.20


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