12-21-2014, 12:09 AM
Any colour filter experts here? I know the trend is to correct many things in post, but there are times that can't be done or has other limitations.
Today I started dabbling with videos of my marine aquaria. http://vimeo.com/115072506 This is my first "serious" video attempt, but don't expect much as there's a lot of noob mistakes in there.
That aside, one of the things I need to fix is the white balance. The lighting used on these aquaria is typically very high kelvin. I have no idea what mine is rated to, but ones on another aquarium which aren't as blue are rated at 25000k for example. Suffice to say this really confuses the camera metering/AWB with clipped blues and red/greens looking rather off. What's detected by camera doesn't match what the human eye perceives at all in this respect. As a workaround I could switch temporarily to daylight lighting, but this then doesn't really set off the phosphorescence.
I'd ideally need say two strengths of yellow filter. One to totally cut blue as far as is practical. One to attenuate it a fair bit, but not remove it totally. The dominant peak for the blues is usually around 460nm if it helps. The attenuator would be to tame the blues, the eliminator would allow the phosphorescence to be shown by itself.
Today I started dabbling with videos of my marine aquaria. http://vimeo.com/115072506 This is my first "serious" video attempt, but don't expect much as there's a lot of noob mistakes in there.
That aside, one of the things I need to fix is the white balance. The lighting used on these aquaria is typically very high kelvin. I have no idea what mine is rated to, but ones on another aquarium which aren't as blue are rated at 25000k for example. Suffice to say this really confuses the camera metering/AWB with clipped blues and red/greens looking rather off. What's detected by camera doesn't match what the human eye perceives at all in this respect. As a workaround I could switch temporarily to daylight lighting, but this then doesn't really set off the phosphorescence.
I'd ideally need say two strengths of yellow filter. One to totally cut blue as far as is practical. One to attenuate it a fair bit, but not remove it totally. The dominant peak for the blues is usually around 460nm if it helps. The attenuator would be to tame the blues, the eliminator would allow the phosphorescence to be shown by itself.
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