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Firewire preview on CRT monitor over exposed.
Hello,
i’m curently editing a long music festival recorded with:
2x Canon XL-2
1x Canon Xm2capture trough: firewire to apple G5
edit with Final Cut Pro.
Monitor: Benq TFT (not for color accuracy, only for desktop editing)
Television used to preview: calibrated sony black trinitron (homemade) – not a professional monitor.We digitize all the – 60 hours – material (preset: DV PAL 48 Khz – anamorphic), and now, we’re starting the editing with the multiclip tool in FC. Everything’s fine, the multiclip edit process is soft and transparent, in my opinion, an very efficient tool.
The problem start when i output the final preview to a CRT tv screen (PALsystem) using my Canon Xm1 as firewire/composite converter.
Suddenely the image was completley overexposed in the CRT TV, without half the saturation and the twice the luminance range. In the desktop Monitor the image is displayed correctly, just as i see in the tv when output the original footage directly from the camera.(Important to notice, until now no color ajustment was made, the footage is pure apple DV Pal capture).
I read in an article, that there are a gamma ajustment to be made in in the DV footage when placed in the timeline, the value indicated is 1.25.
After doing that operation the image appears correct in the Tv screen, but under saturated.My question, could the problem be, the:
hardware: (the board, the Canon Xm1, or the converstion betwen firewire and the camera)
software (codec or wrong finalcut interpretation of the footage)
or me: lack of technical skills.Does anyone ever had this problem? What is the solution, or procedure?
Thank you all,
Ricardo Tabosa
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1 Reply
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Ricardo,
where did read this about the gamma correction for DV footage? Sorry to say that that is completly wrong. DV codecs has been designed with the necesaries gamma adjustment to be watched in TV sets. In fact FC change the gamma for preview purposes so in your FC canvas look more or less as a CRT monitor. (You may have read something about changing the gamma of the stills when bring in them to FC).
What you need to look is a the Videoscope that is the only device that will tell you the real levels of your video signal. A TV set helps you with the interlacing problems and with safe area of the image, but is not a profesional monitor and you can not adjust it properly.
Ricardo please look for an article call:” Video levels in final cut” by Graeme Nattress it will be very helpful for you.
Salud
Rafael.
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