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What is in natural lighting conditions and in an outdoor setting (European forest) the best colour to use for an object you later want to use a chroma key projection on to maximize hue contrast? None of the primary colours seem to qualify.

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    \$\begingroup\$ I really do not understand your question. Do you want to take the photo of a tree, and then cut it? Or this photo is going to be used later as a background? \$\endgroup\$
    – Rafael
    Commented Apr 26, 2017 at 16:08
  • \$\begingroup\$ @Rafael I will take for example a coloured box into the forest. There I will take a picture of said box. I want to project another image on the space that box is taking up in my picture. What colour should the box be to make this as painless as possible? \$\endgroup\$
    – Weckar E.
    Commented Apr 26, 2017 at 16:12
  • \$\begingroup\$ In the forest, I'd guess light blue, but since I'm not a chroma key expert, I'll let someone else write the answer to this question. \$\endgroup\$
    – NoahL
    Commented Apr 26, 2017 at 16:26
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    \$\begingroup\$ You might want to consider asking how to accomplish your end result instead of how best to do it one particular way. \$\endgroup\$
    – Robin
    Commented Apr 26, 2017 at 18:18
  • \$\begingroup\$ @Robin This is a technique I plan to use more often. Therefore I'd prefer the slightly broader question. \$\endgroup\$
    – Weckar E.
    Commented Apr 26, 2017 at 19:52

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I consider there are some rules for chroma keying.

1. A color that is the opposite of what is in front of it.

2. A bright color, mainly a primary RGB color. This way one channel will have enough contrast to be used as a mask. This limits the options to R, G, B but you could use bright orange for example and change the hue to extract a mask. This color choice is taking rule 1 first.

3. If the object in front of the chroma key is semi-transparent probably is better to have a similar color to what the final product will be, to avoid halos. White, for example.

Semi-transparent also includes out of focus stuff, in this case a close up of leaves.

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  • \$\begingroup\$ I hadn't considered using a hue shift to extract the mask through a single colour channel. +1 for you, with a possible accept if no one else pops their head in :) \$\endgroup\$
    – Weckar E.
    Commented Apr 26, 2017 at 16:48
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This can also be accomplished via a simple mask that can be reasonably easily created if you use a box that provides a strong colour contrast. White would probably work well in most forest settings.

Tools like Topaz ReMask make it pretty simple.

I don't know if this is easier than Chroma Key or not, as I haven't used it, but it is how I would do it.

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