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Do you need all 3?

Posted by David Aiken (A) on March 28, 2007 at 22:42:04

In Reply to: Where is the best place to buy filters? posted by jimbill on March 28, 2007 at 09:04:15:

Not a stupid question or a put-down.

If you're using the filters with a colour test pattern like that in the THX Optimiser, Digital Video Essentials, or the like, you don't need the other colours. You make the colour adjustment using the blue filter only. You can use the red and green filters to see if there's any problems with the balance of those colours but you can't adjust them separately using your display's colour control. You may be able to play around with the Tint control if you have one (it's not available with the PAL system which is the video standard here in Australia but it is available with NTSC) and the other filters may help there but I'm not certain since I've never had the Tint control show up on any of my displays.

However, if you want to get a hold of the red and green filters, the options I know of are:

1) buy a copy of Digital Video Essentials. It comes with all 3 colour filters, the filters being coloured celophane similar to that used in the THX 'glasses' filter. Interestingly, I find that the blue in the DVE filters is slightly different to the blue in the THX glasses. The difference isn't great, and it's not enough to give me a different setting when I swap between them while using a test pattern, but they do seem slightly different blues.

2) The blue filter is a Deep Blue 47B filter used for digital separation work. I don't know what the technical description for the other 2 colours are but if you talk to a photographic supply firm who can provide the 3 filters for digital separation work, they'll be able to tell you and probably can supply them as well. I've been trying to get the Deep Blue 47B filter here in Australia but no shop locally stocks them. I placed an order before Christmas with one of the photographic distributors here and they placed an order with Kodak in the US. They told me to expect it to take around 6 weeks when I placed the order, but we're 2 months past that now and the order still hasn't arrived and they have no idea when it will. I would expect supply would be a lot easier in the US than here.

I suspect the proper Deep Blue 47B filter will be slightly different to the filters in the THX glasses and the DVE filters but I'd expect the difference to be extremely slight and not affect results greatly. I don't think the accuracy of the celophane filters supplied by THX and with DVE is spot on but they are close enough for practical purposes. That means that buying a copy of Digital Video Essentials is probably the easiest and cheapest way to get all 3 filters, but the actual photographic filters will be the ones that are spot on for accuracy.

David Aiken

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