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Old Dec 11, 2003, 1:50 PM   #1
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Default Question for Bob regarding CA and color fringing

Hi Bob,

Some time ago you addressed the color fringing issue:

Quote:
Originally Posted by On Mon, 27-10-2003 09:29, Panasonic
Color fringing was the result of poor YUV pixel alignment. For example, it resulted in a thin outline of blue on pink / red objects. I caught that early and it's been corrected. As I said, the on line photos were using pre release firmware.
However, even with production cameras, this issue keeps popping up.

See for example these pictures from koo22's FZ10 pictures page:
1. Tripod, OIS off
2. Handheld, OIS on, Mode 1
3. Handheld, OIS on, Mode 2

Looks like the American flags in the lower left and lower right corners of the picture have been upgraded to include a fourth color.

Now, my questions are:

1. Is this an issue that can be corrected (or, at least, mitigated) in firmware or is it a hardware (lens?) limitation?

2. Does Panasonic consider it a problem and if so, are there any plans to address it?

3. Is there a setting that can minimize the effect (apart from postprocessing)?

Thank you!

Best wishes,
Alex.
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Old Dec 11, 2003, 4:14 PM   #2
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I'm not Bob, & will be interested to hear what he has to say. This topic has been discussed earlier on this forum. I had come to the conclusion that what I see is as a result of the lens. This because the C.A. is worse towards the edges of the picture.

I'm interested to find out how much variation there is between different samples of FZ10

The C.A. can be largely corrected by Panatools.
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Old Dec 11, 2003, 5:52 PM   #3
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Quote:
3. Is there a setting that can minimize the effect (apart from postprocessing)?
Those shots have significant ca all over, not just at the edges. They were taken at iso 50 and shutter 1/125. The light was not good. I think if the iso had been increased to 100 and the shutter speed to 1/250 the ca would have been reduced. How much? We dont know.
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Old Dec 12, 2003, 6:46 PM   #4
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Default C.A. in pic

Look again. In the middle of the image there is very little CA.
You are looking at the image when it is much larger than a normal print, which magnifies the effect.

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