How can I remove all images from a shot except for anything with a specific color?

[Graham Bernard]

This is what I achieved using my own material and the Channel BLEND.

Apologies for my lousy PenCraft!:

“London Eye” RED Script AND London Eye:-

“London Eye” RED Script ONLY against a lower SWAPPED-out Chequers:-

“London Eye” RED Script ONLY against a lower SWAPPED-out Flowers:-

And, here ARE those Flowers!

Cheers

Grazie

Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge

[Angelo Mike]

Thanks, Graham.