Pixel shift technology and black level at DVinfo.net

Giampy Car · June 22nd, 2003, 02:09 AM

Please let me know what you think.
I was looking my footage on a dlp projector.
The image looked well but specially in the black areas the color was a little bit green.
My camera is an XM1 and the image setting was on the center between red and green.
To better understand i've tried to capture some black images (closing the camera with the cover) with different camera setting and looking the result by using photoshop.
The resul was that in any cases the green level was twice of red.
What do you think about, it's problem of pixel shift technology of it's problem of camera setting?
Waiting for your reply

Don Berube · June 22nd, 2003, 06:17 AM

If your image is predominantly green, sounds like your camera needs to be serviced.

- don

Andre De Clercq · June 22nd, 2003, 09:21 AM

I'm not familiar with this cam, but your problem is not related to the pixel shift technology. If there is no "black balance" setting available (like DVX100 and others have), then you need it to be serviced like Don says.

Giampy Car · June 23rd, 2003, 01:04 PM

Thanks for the replies.
Could it be also problem of white balancing?
I know that if you make a warm balance using for example a warm card the black goes to a green predominancies.
My second question: in whict way the camera set the white balance?

Andre De Clercq · June 23rd, 2003, 02:41 PM

White balance sets the RGB amplification(contrast) ratio's of the highlights and should not change the black. Black balance (low light adjust) sets the ratio's of the RGB offsets (differential brightness). Today's cams perform white balancing by analysis of the image and correcting in such a way that averaged low saturation parts get equal RGB amps (in auto and manual)

Don Berube · June 23rd, 2003, 02:54 PM

Giampy,

Do you have an XL1 or the newer XL1S? Do you have the manual? You can always download the .pdf version here:
http://canondv.com/downloads/product_manuals.html

Do you know how to contact Canon Repair in your country? I would love to visit your beautiful country in the near future!

Let us know how everything is going,

- don

June 22nd, 2003, 02:09 AM	#1
Giampy Car New Boot Join Date: Jan 2003 Location: Italy Posts: 18	Pixel shift technology and black level Please let me know what you think. I was looking my footage on a dlp projector. The image looked well but specially in the black areas the color was a little bit green. My camera is an XM1 and the image setting was on the center between red and green. To better understand i've tried to capture some black images (closing the camera with the cover) with different camera setting and looking the result by using photoshop. The resul was that in any cases the green level was twice of red. What do you think about, it's problem of pixel shift technology of it's problem of camera setting? Waiting for your reply __________________ Giampy

June 22nd, 2003, 06:17 AM	#2
Don Berube Moderator Join Date: Mar 2002 Location: Boston, MA (travel frequently) Posts: 837	If your image is predominantly green, sounds like your camera needs to be serviced. - don __________________ DONALD BERUBE - noisybrain. Productions, LLC Director Of Photography/ Producer/ Consultant http://noisybrain.com/donbio.html CREATE and NETWORK with http://www.bosfcpug.org and also http://fcpugnetwork.org

June 23rd, 2003, 01:04 PM	#4
Giampy Car New Boot Join Date: Jan 2003 Location: Italy Posts: 18	Thanks for the replies. Could it be also problem of white balancing? I know that if you make a warm balance using for example a warm card the black goes to a green predominancies. My second question: in whict way the camera set the white balance? __________________ Giampy

June 23rd, 2003, 02:54 PM	#6
Don Berube Moderator Join Date: Mar 2002 Location: Boston, MA (travel frequently) Posts: 837	Giampy, Do you have an XL1 or the newer XL1S? Do you have the manual? You can always download the .pdf version here: http://canondv.com/downloads/product_manuals.html Do you know how to contact Canon Repair in your country? I would love to visit your beautiful country in the near future! Let us know how everything is going, - don __________________ DONALD BERUBE - noisybrain. Productions, LLC Director Of Photography/ Producer/ Consultant http://noisybrain.com/donbio.html CREATE and NETWORK with http://www.bosfcpug.org and also http://fcpugnetwork.org

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June 22nd, 2003, 09:21 AM	#3
Andre De Clercq Major Player Join Date: Sep 2002 Location: Belgium Posts: 804	I'm not familiar with this cam, but your problem is not related to the pixel shift technology. If there is no "black balance" setting available (like DVX100 and others have), then you need it to be serviced like Don says.

June 23rd, 2003, 02:41 PM	#5
Andre De Clercq Major Player Join Date: Sep 2002 Location: Belgium Posts: 804	White balance sets the RGB amplification(contrast) ratio's of the highlights and should not change the black. Black balance (low light adjust) sets the ratio's of the RGB offsets (differential brightness). Today's cams perform white balancing by analysis of the image and correcting in such a way that averaged low saturation parts get equal RGB amps (in auto and manual)