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Old Dec 20, 2003, 6:58 AM   #1
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Default PDR-M700 - purple streaks 16s/ISO400 (send email to toshiba)

Hello,

problem: purple streaks in the upper left corner of image when 8 - 16 second exposures are made. ISO 200-400

Has anyone found a remedy for those darn purple streaks in the upper left corner. I have discussed this issue with toshiba on several occasions. I am expecting them to provide a firmware upgrade remedy. The 1.10a upgrade is of no help. ( Got it! )

The only solution seems to be lower the ISO setting and using 8 sec.

Below are copies of Toshiba support replies.
Please join me in sending this nice fellow our disappointment.
His email is

[email protected]


thanks
Michael P.



>>>>>>>>>>>>>>>>>>>>>>

Mr. Panucci,

We have posted new firmware but it does not address your concern. The
engineers have been made aware of the problem but I do not know if and when
it will be addressed. When it is addressed, it will be in a firmware
upgrade but I do not know when. I am sorry I can not be more specific at
this time but this is all the information I have available to me.

I apologize for the inconvenience.



Ralph Abramo
National Service Manager
Imaging Systems Division Service Department
Toshiba America Information Systems

>>>>>>>>>>>>>>>>>>>>>>

Hello, I have bought and returned 3 of your PDRM700 cameras because blue
streaks in the left upper corner of 8-16 sec exposures. Please tell me what
the probelm is. See the link below for a review that also identifies
problem.


http://www.imaging-resource.com/PRODS/M700/M700A12.HTM


Dear Mr. Panucci,

We are aware of this issue and our engineers are working to resolve it
soon. As soon as we have a fix, we will post it on our web site probably as
a firmware upgrade.

I apologize for the inconvenience.

Best Regards



Ralph Abramo
National Service Manager
Imaging Systems Division Service Department
Toshiba America Information Systems
Tel: 949-461-4992
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Old Dec 20, 2003, 4:40 PM   #2
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Default purple streaks in upper left corner

Hi,

concerning your bleu steaks in the upper left corner, what I saw was I was testing the camera in my basement with no FLASH, using long exposure time, at night and in very low light condition.

I took a few picture with 3, 4, 5 second exposure, the pictures came out very nice and no blue streaks.

I wanted to show the picture to my wife, and I took an other picture in the same condition but I had a 13 watts neon light, the desk top model lighted about 6 inches at the back of the camera, a little bit higher than the camera and a little bit to the right.

I took the picture and the blue streaks were there in the upper right corner of the picture. the ISO was to 200.

So I took an other picture with the setting as the previous picture but with the light turn off.

No more blue streaks.

What I suspect is if you have a light source near the camera, even if it is low, with the long exposure time the CCD will oversaturate and make blue streaks.

I am not an engener, but that's what appen.

Make your own test, and let me know.
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Old Dec 22, 2003, 4:19 AM   #3
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Default Re: purple streaks in upper left corner

hello,

These purple / blue streaks are random and not consistently repeatable.

For normal camera CCD noise,, a dark frame subtraction process can be used on my computer separately. But, I dont regard this as noise. This is saturation of the CCD.

If I use a dark frame subtraction processing program to remove these streaks,,, the results will not be good.

In the same night time or dark setting,,,,
if you look at the histogram before shutter release,, it will show high brightness on the left side of the image.

Curious ??
I wish I could figure out what is making the camera see this brightness on the left for what is a "dark frame".

I could sometimes re-compose the shot to make the histogram brightness differently balanced. But as soon as I try to make a dark frame the histogram sees brightness on the left again.


michael
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Old Dec 22, 2003, 4:34 AM   #4
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Default Re: purple streaks in upper left corner

just to ad to the last posting,

to understand this issue better,,, lets regard this problem as a dark frame issue.

And,,, to see the actual problem appear on your camera...
Take a 16 second / ISO 400 / f 2.8 with the cap on the barrel.

When the processed image appears,,, you will see the purple /blue streaks ( saturation)

I take a lot of night time shots.
So taking a shot with the cap on the barrel is a good representation of a dark frame.

michael
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