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A weird pattern in the highlights

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  #1  
Old 07-17-2009, 04:42 PM
domis domis is offline
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A weird pattern in the highlights

This picture im retouching got this weird pattern in the highlights which i've never had to deal with nor seen before.

Is this a known problem that is treated in a special way?

The picture is shot in aRGB (8bits), can that have caused it?
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Old 07-17-2009, 04:50 PM
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mikedimples mikedimples is offline
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Re: A weird pattern in the highlights

Weird, I've never seen anything like that before. I think Aztec aliens may be trying to communicate with you.
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Old 07-17-2009, 04:56 PM
domis domis is offline
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Re: A weird pattern in the highlights

Damn those aztec aliens, they should stick to the fields..

This is a shame as the picture is supposed to be printed in a magazine
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Old 07-17-2009, 05:48 PM
Jerryb Jerryb is offline
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Re: A weird pattern in the highlights

hi,
I never seen anyting like that kind of moire pattern... maybe using one of the meathods that posted will help improve it.... or the article below has other suggestions....

obviously it the camera.... how common i don't know.. did a little search on it.... found this one thread where the guy was complaining about his nikon doing it....
http://forums.dpreview.com/forums/re...essage=8211480

final note from the thread your image might salvagble....
Quote:
Originally Posted by domis View Post
This picture im retouching got this weird pattern in the highlights which i've never had to deal with nor seen before.

Is this a known problem that is treated in a special way?

The picture is shot in aRGB (8bits), can that have caused it?
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Old 07-17-2009, 08:35 PM
Mike Mike is offline
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Re: A weird pattern in the highlights

I have seen something similar to that when using a very high ISO in the camera.
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Old 07-18-2009, 01:26 AM
Quantum3Studio Quantum3Studio is offline
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Re: A weird pattern in the highlights

Seems a sensor's problem related with the Bayer Filter or something in the ADC. Probably can be solved by a firmware update. It's the typical pattern known as mosaic. You have 3 mosaics in digital, one per color. When the 3 mosaics are engaged you have the photo, that's called demosicing but here, the mosaics are half pressent.
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Old 07-18-2009, 01:33 AM
Quantum3Studio Quantum3Studio is offline
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Re: A weird pattern in the highlights

Not a moiré effect, nor fringging, nor high ISO, nor 8bpc or sRGB stuff. Those effects are not like this pattern. Also, a emphatized moiré is done by the low pass filter located before the sensor/bayer filter. This is not an usual problem also. Thinking twice, I think the problem is the ADC (Analogic to Digital Converter). The ADC converts our reality to binary, giving to each color a number ID and it's the responsible of demosaicing and here, I see a very problem in the demosaicing process... It could be a problem when converting from RAW to another file type, but quite impossible. You should ask in digitalgring.com Those are wise asses in this field.
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Old 07-18-2009, 10:55 AM
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mistermonday mistermonday is offline
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Re: A weird pattern in the highlights

To me this looks like the image has been encrypted with some digital pattern. This may be a security feature. What is the source of the image? A scan? Output form a camera?
Refards, Murray
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Old 07-18-2009, 04:04 PM
domis domis is offline
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Re: A weird pattern in the highlights

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You should ask in digitalgring.com Those are wise asses in this field.
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Quote:
To me this looks like the image has been encrypted with some digital pattern. This may be a security feature. What is the source of the image? A scan? Output form a camera?
Refards, Murray
The picture is shot by Canon 1ds mark 3. Should be a good camera!
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Old 07-19-2009, 12:13 AM
Quantum3Studio Quantum3Studio is offline
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Thumbs up Re: A weird pattern in the highlights

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Originally Posted by domis View Post
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The picture is shot by Canon 1ds mark 3. Should be a good camera!
Well... the latest Canon (5DMKII) was having a very, very big problem which was fixed by a firmware upgrade. The pictures showed some kind of banding and also black dots next to specular lights or other highlight clipping source like that. It was fixed like 4 months after the camera was released. The only thing it wasn't fixed, 'cause it's a hardware problem (the low pass filter), was the big presence of halos and pixelation in the edges of subject when shooting backlight whatever the lens used.

The 1DsMKIII is a great camera, indeed, but even best cameras can fail.

Here is the link (I checked it this time )

http://digitalgrin.com/

Have a good weekend,

Mart
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