Here's my problem.
I have a static background that the client created. I want to replace it with much the same thing but animated. I have a suitable DJ HD Jumback. Both it and the original are one colour with only variation in luminance making up the image, it's actually just bubbles underwater. Now I want to make the water in the Jumpack the same colour as the still. I can sample both colours to get either HSL or R'G'B'. The only FX that will do what I want is the Channel Blend, CC primary or secondary are the wrong tools and for sure I tried them as they're simple to use.
So what I cannot get my head around is how to calculate the RGB matrix coefficients for the Channel Blend FX to shift from one known colour to another known colour. What I have got my head around is that I need to be careful not to shift what is the Y' value in the process.
Sorry to ask such a technical question on a Sunday morning but I think the answer to this could help a lot of us. This goes right back to the Technicolor Challenge. Someone did ask back then how the correct coefficients were derived but there was never an answer.
Bob.
I have a static background that the client created. I want to replace it with much the same thing but animated. I have a suitable DJ HD Jumback. Both it and the original are one colour with only variation in luminance making up the image, it's actually just bubbles underwater. Now I want to make the water in the Jumpack the same colour as the still. I can sample both colours to get either HSL or R'G'B'. The only FX that will do what I want is the Channel Blend, CC primary or secondary are the wrong tools and for sure I tried them as they're simple to use.
So what I cannot get my head around is how to calculate the RGB matrix coefficients for the Channel Blend FX to shift from one known colour to another known colour. What I have got my head around is that I need to be careful not to shift what is the Y' value in the process.
Sorry to ask such a technical question on a Sunday morning but I think the answer to this could help a lot of us. This goes right back to the Technicolor Challenge. Someone did ask back then how the correct coefficients were derived but there was never an answer.
Bob.