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  • Keylight noise and saturation issue

    Posted by Matt Gerard on May 13, 2008 at 5:31 pm

    I am having an issue with keying some DVCPROHD 720P60 footage. While I am working in keylight, everything looks fine, and I can pull a really good key. But things go nasty when I do a RAM preview or try to render it out. The footage gets super saturated and noisy. I have 2 clips of a guy on green (DigiComp Green lit to 40 IRE) and want to render out a lossless with alpha for compositing. I have some screen shots of the before and after, i just need to post them somewhere.

    I sent the footage to my boss’s computer, and he was able to render them out just fine. We both have AE CS3, I’m still on a PPC, but he is on an Intel Quad setup. He even saved his AE project which I opened and it still does it.

    And, after I do a RAM preview, looks crappy, go and adjust a parameter in keylight, it goes back to looking good.

    Any ideas? Sounds like a setting or preference in my computer, what would that be? I do have a AJA Kona card, but it doesn’t matter if video preview is on or off.

    THanks!

    MAtt

    Its more fun to ride a slow motorcycle fast than a fast motorcycle slow…

    Matt Gerard replied 18 years ago 4 Members · 6 Replies
  • 6 Replies
  • Matt Gerard

    May 13, 2008 at 5:59 pm

    Dave-

    I do have an email into their support, so hopefully they will have some ideas. Its odd, because it seems that this only happens on my computer. I have compared preferences and settings and have them as close as I can on both machines. If it ends up being operator error on my part, I would happily admit it and post it here in case someone else searches the forum looking for the same issue. If I get a solution from The Foundry, i will certainly post it here for that reason.

    Thanks!

    Matt

    Its more fun to ride a slow motorcycle fast than a fast motorcycle slow…

  • Kevin Camp

    May 13, 2008 at 7:48 pm

    you might check the project settings for your mac vs. your boss’s and see if either of you have color management turned on, and, if you do, you are both using the same profiles….

    select file>project settings, if ‘working space’ is anything other than ‘none’ ae is trying to adjust colors based on the profile selected… if you have different settings selected, then that could part of the problem…

    also, there is an update to keylight (1.2v8 i think) from the foundry’s site… not sure if that will help.

    Kevin Camp
    Senior Designer
    KCPQ, KMYQ & KRCW

  • Matt Gerard

    May 13, 2008 at 7:59 pm

    I did look at the project settings and the sequence settings, and the color mgmt. was turned off. I also did update to 1.2v8 from Foundry’s website. I even opened up the new project that my boss had made on his machine, and It still is looking wonky. Hopefully I will hear from Foundry by tomorrow.
    I had my boss render out the movies for me, so no problem there. would be nice to figure it out, though, the key was darned near perfect. Never saw such a nice key.

    Thanks!

    Matt

    Its more fun to ride a slow motorcycle fast than a fast motorcycle slow…

  • Joey Foreman

    May 14, 2008 at 4:00 am

    How do you ride a slow motorcycle fast if it’s slow?

    Joey Foreman
    Editor/Animator
    Nowhere Productions, Athens, GA

  • Phil Beastall

    May 14, 2008 at 2:43 pm

    Have you tried playing with the replace method option? I had the same problem when using the default soft colour – it added a lot of noise. By either using source of hard colour, it seemed to help a lot with the issue.

  • Matt Gerard

    May 14, 2008 at 4:19 pm

    Here’s an answer for both previoous questions-

    Phil- I haven’t tried that, I will do so this afternoon, and see if that helps. Its interesting because I rendered out a full piece last night, and the first few frames were fine, at frame 4, it whacked out. Sometimes it would go batty on frame 2, 3, it was random. Almost sounds like a RAM chip problem, doesn’t it? I’ve had stranger things happen because of bad RAM chips. Might try to strip RAM out, then try again. Not sure, just grasping at ideas here…

    And Joey-
    How do you ride a slow motorcycle fast if it’s slow?

    Its a conundrum, isn’t it? A quandary, dilemma, something that makes you go hmmmm…..

    In theory, the joy of riding a motorcycle is reduced proportional to the percentage of the total capability of said bike when compared to the rider’s ability. This can be expressed as such-
    where=

    Mt= Mental acuity (freshly awake in the morning, or still burping up from the Blatz and Beans eating contest last night) indicated from 1-10, where 1 = Comatose, 10 = Valentino Rossi like awareness.

    A= ability again expressed as 1-10, where 1= Squid Newbie, 10= Keith Code

    Ca= capability of motorcycle, 1-10, 1=Aprillia RS50, 10= Suzuki Hayabusa

    En= enviromental hazard variable(on track, on streets, raining, flock of pigs on road, etc…) 1= Flock of Pigs, 10 = Perfect track day

    (Mt*A)/(Ca/100)-En= Coefficient of J

    Put this into practice with me on a powerful sportbike where Ca = 8.5-
    (8*5)/(8.5/100)-8=462.58823529412

    Wheras, with me on a slow motorcycle CA=3.5

    (8*5)/(3.5/100)-8= 1134.85714285714

    As you can see, with my ability on a smaller bike, riding to a higher percentage of the capability of the motorcycle (ie, riding closer to the edge of the bike’s performance abilities), I get greater joy. This can also be explained that while my abilities (including my ability to not load my pants if I have a close call at high speeds) stay consistant, the ability of different motorcycles change drastically.

    In conclusion, I have more fun riding a slower bike closer to the edge of its performance envelope, as it would more closely match my own ability envelope. The rush I get from riding a motorcycle (besides getting 40-45 mpg) is from pushing the bike to its edge, and mine. I can do that more safely with a bike where I can use 85% of its abilities, instead of a superbike crotch rocket where I would only be able to use 35% because of my own lack of skill. If i push the bike or myself beyond its/mine capability, the consequences would (hopefully) be less drastic on a slower motorcycle.

    Also, keep in mind that the math stated above is at best, full and complete BS. Not undergoing any proof of concept, testing, or sound thought processes it is totally without warranty, guarantee, or refundability. Although, methinks Stephen Hawkins would be proud…

    In conclusion (again?!?) this simple catchphrase of mine was never intended to be thought of this much, and frankly, my head hurts now. I will now attempt to forget everything I just put into this post, as my mind is like an attic, only so much room. I’m sure there is a way to put this into an AE expression including 100’s of layers, precomps and effects with pickwhips flying across my screen like gnats on crack, but I need to go back to slapping powerpoints into a presentation video, and make it look interesting.

    Now thats the hard part.

    Cheers-
    Matt

    Its more fun to ride a slow motorcycle fast than a fast motorcycle slow…

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