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View Full Version : Problem diagnose (Wierd flash pattern on suit)

morehtml
25th of April 2009 (Sat), 20:58
Shot using a 1DSMK III, 24-105 F4, 580 II flash on manual 1/60th, f 6.3, ISO 400, flash bounced off 10 foot white drop in ceiling (banquet hall type)

This wierd pattern shows up on this mans suit in group shots but only his suit. No other patterns are visible in image. Took multiple other group shots here with no issues.



Any ideas as to the cause?
canonphotog
25th of April 2009 (Sat), 21:03
It's called moire', but I'm not sure what caused it to show up. That's probably the worst case of it I've ever seen.
morehtml
25th of April 2009 (Sat), 21:06
I'm trying to decide if it photoshopable he's in several wedding shots same problem in all. Just this one guy's suit.

Any way to aviod it for future reference beside having him change suits lol
hawkeye60
25th of April 2009 (Sat), 21:23
A little Photoshop...
morehtml
25th of April 2009 (Sat), 21:31
A little Photoshop...

Looks great I guess I'll just photoshop the images with this person.
eduardofrances
25th of April 2009 (Sat), 21:54
Looks great I guess I'll just photoshop the images with this person.
You may have to consider in the future changing camera too IMHO, Moire is caused by patterns that exceed the resolution of the sensor or have a weaker anti alias filter in front of the sensor and in it is the first time I see a moire that looks in such a strong way.
dpds68
25th of April 2009 (Sat), 22:02
Was this shot in JPEG or RAW ?
FlashZebra
25th of April 2009 (Sat), 22:08
Shot using a 1DSMK III, 24-105 F4, 580 II flash on manual 1/60th, f 6.3, ISO 400, flash bounced off 10 foot white drop in ceiling (banquet hall type)

This wierd pattern shows up on this mans suit in group shots but only his suit. No other patterns are visible in image. Took multiple other group shots here with no issues.



Any ideas as to the cause?
I have been looking for one of those psychedelic zebra suits for some time, can you find out where the luck guy bought those threads?

Enjoy! Lon
morehtml
25th of April 2009 (Sat), 22:20
Was this shot in JPEG or RAW ?

RAW
Gregory C
25th of April 2009 (Sat), 22:23
ok, Hawkeye60,,,how did you do it ?
Tee Why
26th of April 2009 (Sun), 02:24
Just selected the suit and desaturated it and turned down the contrast. I guess if you really wanted to, you can use the heal or clone tool and get rid of some of the striped areas. Sorry, I compressed it a bit so it's a bit smudgy. Oops, also didn't fully select out the second finger. But you get what I'm talking about.
360380
gooble
26th of April 2009 (Sun), 02:28
A little Photoshop...

That got rid of it nicely. What did you do in PS?
PhotosGuy
26th of April 2009 (Sun), 08:53
You may have to consider in the future changing camera too IMHO, Moire is caused by patterns that exceed the resolution of the sensor or have a weaker anti alias filter... You must have missed that it's a 1DSMK III? Or else you forgot the ;) ?

A bit of Gaussian Blur on the suit might help.
René Damkot
26th of April 2009 (Sun), 11:14
Mess about with the channel mixer and mask off the suit. The green channel is nearly moiré free:
(at least compared to the red and blue channel :p)

http://img.skitch.com/20090426-qqjkun2q2e9c1ugts2n7bm19q1.jpg
hawkeye60
26th of April 2009 (Sun), 11:20
ok, Hawkeye60,,,how did you do it ?

Since the suit is grey, I just used a B&W adjustment layer, and moved the color sliders to remove the pattern.
egordon99
27th of April 2009 (Mon), 09:08
It would be cheaper to tell that guy to change his suit! :lol:

You may have to consider in the future changing camera too IMHO, Moire is caused by patterns that exceed the resolution of the sensor or have a weaker anti alias filter in front of the sensor and in it is the first time I see a moire that looks in such a strong way.