Is noise/grain unavoidable with the 7D?
Hello!
I recently recorded a scene with the 7D. No fast movements occur. I had the time to light rather carefully. My camera settings during shooting: ISO: 100. Sharpness and contrast set to lowest. Saturation set to 2 below standard. My aim was to avoid noise as much as possible. The scene contained areas of deep shadow, from darkest dark and up. I converted the mov file to the Cineform format using the trial version of Cineforms HDlink, Resulting movie is still grainy and noisy, albeit not so much. I realize I was naïve, but I actually thought that setting the ISO to lowest and lighting carefully would eliminate grain/noise issues. Now I conclude eliminating noise in deep shadow areas is not possible. Could someone please confirm/disagree with my conclusion? I just want to know the limitations I'm working under, so I don't waste time trying for the impossible. Regards, Nikolaj |
Check how sharpness and contrast are set on your monitor. Many monitors have these set pretty high "out of the box" and any extra emphasis on either or any oversharping will cause artifacts that look like digital noise where there really is none.
A year ago I got a new Dell with a 22" Dell widescreen monitor. I never thought to check sharpness, brightness, and contrast on the monitor itself but attempted to use the software approach to set it up. I had no end of video looking way too "noisy" on that one while my other workstation monitor worked well with both video and Photoshop. Plenty of sharpness and detail but very little noise. I used the buttons on the monitor and found sharpness and contrast up around 90%-95% with brightness a bit high too. Once I pulled everything down to about midpoint things looked a lot better. |
I did as you suggested; it seems to have some small effect. Thanks a lot for the suggestions.
But the problem remains I think. Hopefully the attached clip will give you an idea of the problem. I'll upload it when it works... encountering problem with uploading my movie sample. |
Digital video and photo don't handle dark areas of an image very well. Black and darker shades of gray will tend to be noisy and/or pixelated.
Beyond that, you should stick with the "good" ISO values of 160, 320, 640 etc. as has been discussed elsewhere in this forum. ISO 100 is actually slightly noisier than 160. |
I find the 7D noisy and don't use it for stills because of that. I think if you have a scene without dark shadows it will record it fine, it's just part of the limitations a small sensor with 18 megapixels. The canon 5D2 is much better with noise.
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Using the multiples of ISO 160 does seem to have less noise, I don't use ISO 100 as a minimum but 160 instead.
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