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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
Follow Ups:
After your explanation I figure I probably don't need the others. I am going to get the GetGray download and it mentions three filters. Just assumed I needed them.
I have GetGray and you only need the blue filter for it.The test patterns on GetGray are a hell of a lot easier to get to than those on Digital Video Essentials if you want the patterns for a fixed pixel display. DVE has them, but the brightness and contrast patterns are "hidden" in the reference patterns chapter and getting there is a pain. DVE has the worst navigation system I've come across.
I got DVE first, and purchased GetGray after replacing my CRT screen with an LCD. I still find DVE useful at times, and there's a lot of interesting and sometimes useful info in the narration that accompanies the early, easily accessible, sections of the disc. The test videos are also useful to show just what getting things set right can actually do for you.
David Aiken
Just downloaded it and the manual. Is it going to be hard to use for a true novice? He starts off by saying "don't be looking for narrative instructions".
While there's no "hand-holding", with the download you also get documentation as to what's on the disc and some information about the test patterns. There's a very long thread on AVS (see the link below) that should answer any question you would have about GetGray. But unless you have calibration equipment, the patterns for Brightness, Contrast, Color, Tint and Sharpness are the only ones you'll really use.
Not much else to say except:- with my LCD screen, I find I get best results for both Brightness and Contrast using the 5% Step Gray Ramps. I set both of those controls using this one pattern. Set the contrast as low as it will go, adjust brightness first, then bring the contrast up until you're happy, recheck brightness and contrast again from that point because you may want to fudge brightness again after adjusting the contrast and that may change your contrast slightly again. YMMV. There are other patterns for these 2 settings including a different pattern for each of them and a further pattern that basically combines the two separate patterns. The gray ramps seem to work best for my eyes but you may be different and your display may react differently to my LCD.
- Sharpness on my screen is best set as low as it will go. Set sharpness as low as you can before doing the other tests, then adjust it last.
That's about it. Do it again after a week or two when your eyes have adjusted to the changes from your current settings and you may find you want to make a small change somewhere again. Redo the whole thing every few months in case your display has settings that move over time. Once you get a bit of experience it takes no time at all.
David Aiken
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