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Moirée DP2M

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koju

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Does anyone have any suggestions on how to remove the excessive moirée in this picture taken with a DP2M?



73ed8f24dd6d4db1894b26a33daa7fc1.jpg

On picture taken in the shade the moirée effect is less, but still irritating.
 
That has to be a re-sizing artefact or can you show us the full size original?
 
Yes, it's artifact, no moiré. You can't have moiré with Foveon technology.
 
Take it into Photoshop.

Using the polygon, with some feathering, select a part of the shirt where the bands are running in the same direction, roughly parallel to each other.

Apply Motion Blur, setting the angle to suit the bands.

Repeat with different angles for other areas.
 
That's not moire, that's how the shirt was designed, look at the collar.
 
digi2ap said:
That has to be a re-sizing artefact or can you show us the full size original?
Click to expand...
If it turns out to be a re-sizing artifact, which does seem likely, try applying a small amount of Gaussian blur before down-sampling, maybe 0.7px? The greater percentage of down-sampling, the more the blur amount needed.

How about posting a crop from a 100% JPEG? Then we can all play with it :-)
 
Last edited:
Rudi said:
Get a little more distance between you and your model (ca. 1 foot or so.)
Click to expand...
Intersting idea. I'd suggest dressing the model differently (btw: using a Sigma I'd prefer blue over red here).

SCNR
 
papillon_65 said:
That's not moire, that's how the shirt was designed, look at the collar.
Click to expand...
Hi there

I think will have to agree with papillon_65, that's the shirt pattern not moire.

my daughter has blouse with virtually the same pattern.

Regards

Keith W
 
I had to deal with this for the DP3M shot shown below. The window screen would interact with the downsizing method in different ways depending on the method, as well as the sharpness of the original image. This is more properly called aliasing I think, but appears as a moire-like pattern in the overall image.

These images are best viewed in full-res, as uploaded to DPR. See my gallery to download the full-res originals.


Final image looks good. For full-size original as uploaded to DPR, see my gallery.


Each of several possible downsizing methods in Photoshop will produce slightly different results.


This is a 100% crop in which you can clearly see the window screen.

--
Tom Schum
Celebrate mediocrity (in moderation)
 
Last edited:
kwaller said:
papillon_65 said:
That's not moire, that's how the shirt was designed, look at the collar.
Click to expand...
Hi there

I think will have to agree with papillon_65, that's the shirt pattern not moire.

my daughter has blouse with virtually the same pattern.

Regards

Keith W
Click to expand...
Hi there again, unfortunately the more i look at the image it does appear to be colour moire and not part of the shirts design so please disregard my post above, couldn't delete or edit it.

Regards

Keith W
 
kwaller said:
kwaller said:
papillon_65 said:
That's not moire, that's how the shirt was designed, look at the collar.
Click to expand...
Hi there

I think will have to agree with papillon_65, that's the shirt pattern not moire.

my daughter has blouse with virtually the same pattern.

Regards

Keith W
Click to expand...
Hi there again, unfortunately the more i look at the image it does appear to be colour moire and not part of the shirts design so please disregard my post above, couldn't delete or edit it.

Regards

Keith W
Click to expand...
It's definitely the shirt design, no moire on the folded cuff and the pattern on the collar and angle of the collar is a dead giveaway. The pattern on the shirt also gives it away, it's not repeating, there are different patterns on it.
 
papillon_65 said:
It's definitely the shirt design, no moire on the folded cuff and the pattern on the collar and angle of the collar is a dead giveaway. The pattern on the shirt also gives it away, it's not repeating, there are different patterns on it.
Click to expand...
The expression "moire" as used in photography does come from a type of fabric that shows a similar pattern. It is more a type of weave than a design as such.
 
D Cox said:
papillon_65 said:
It's definitely the shirt design, no moire on the folded cuff and the pattern on the collar and angle of the collar is a dead giveaway. The pattern on the shirt also gives it away, it's not repeating, there are different patterns on it.
Click to expand...
The expression "moire" as used in photography does come from a type of fabric that shows a similar pattern. It is more a type of weave than a design as such.
Click to expand...
I know what moire is and that is clearly the shirt design unless someone can prove otherwise.
 
How does it look taken from a high resolution tiff to a print? Any digital device will produce Moire because they are digital devices and are governed by the fact without anti-aliasing filter will show aliasing. A digital monitor is a digital device. My guess is some of this is related to the fact it is sized to be displayed on a digital device on the Internet.

However, such patterned fabric is very prone to Moire because of the high spatial frequency content. We now the Foveon will display Moire since it has no anti-alising filter. What would be really interesting would be to see this same image using the Q sensor.
 
xpatUSA said:
digi2ap said:
That has to be a re-sizing artefact or can you show us the full size original?
Click to expand...
If it turns out to be a re-sizing artifact, which does seem likely, try applying a small amount of Gaussian blur before down-sampling, maybe 0.7px? The greater percentage of down-sampling, the more the blur amount needed.

How about posting a crop from a 100% JPEG? Then we can all play with it :-)
Click to expand...
Not forthcoming, apparently?
 
maceoQ said:
CatchAlive said:
Yes, it's artifact, no moiré. You can't have moiré with Foveon technology.
Click to expand...
Sure it can produce moiré.
What you mean is color-moiré.
Click to expand...
Can you explain please?

For me moiré is caused by interpolation used by a Bayer sensor. Since Foveon doesn't interpolate anything because it has "every pixel information", I don't understand why it could produce moiré... (but I'm not a pro I have to admit...)
 
CatchAlive said:
maceoQ said:
CatchAlive said:
Yes, it's artifact, no moiré. You can't have moiré with Foveon technology.
Click to expand...
Sure it can produce moiré.
What you mean is color-moiré.
Click to expand...
Can you explain please?

For me moiré is caused by interpolation used by a Bayer sensor.
Click to expand...
Sorry to say that moiré is not caused by interpolation. Even more sorry to say that the root cause of the so-called color-moiré is the Bayer CFA pattern itself although the de-mosaicing process does have some effect.
CatchAlive said:
Since Foveon doesn't interpolate anything because it has "every pixel information", I don't understand why it could produce moiré... (but I'm not a pro I have to admit...)
Click to expand...
Now I show you the result of my recent test of Sigma DP2M versus Panasonic GH1 which have similar-sized pixels:

2b1f02f70b294399945b9d667b7edb65.jpg

At left, the patterns around the center are indeed moiré - caused by the lines being closer together (in the image plane) than the Foveon pixels. At right, the patterns around the center are also moiré caused by the lines being closer together (in the image plane) than the Bayer-pattern pixels for each CFA color. The moiré is therefore much worse and, because it affects the RGB colors differently, is often called 'color-moiré'.

Hope this helps,



--
Cheers,
Ted
 
Why would you want to remove that? It looks SO cool.

;)

I thought Merrill cameras were incapable of producing moiré (unless it is something happening in real life). I guess not, huh?
 
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