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Moire Pattern on Brickwork

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  #1  
Old 08-18-2005, 10:34 AM
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DannyAustin DannyAustin is offline
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Moire Pattern on Brickwork

Hi all.
i have an image of a house which i am marketing
However the image is fairly stunning except for the brickwork which has a really strong Moire pattern which I can't seem to get rid of without blurring it slightly which I'm trying to avoid?
Any ideas? Thanks!!
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  #2  
Old 08-18-2005, 10:37 AM
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Gary Richardson Gary Richardson is offline
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Hi Danny,

Try posting an image for us to look at, the way you deal with moire will depend to a large extent on the image.
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Old 08-18-2005, 11:09 AM
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DannyAustin DannyAustin is offline
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OK Gary here it is what do you reckon???
The only thing is this is just low res version so doesn't look as bad but open to suggestions...
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File Type: jpg Main_house.jpg (76.1 KB, 58 views)
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Old 08-18-2005, 11:53 AM
Cassidy Cassidy is offline
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sorry at that res moire not apparent
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Old 08-18-2005, 03:45 PM
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Panpan Panpan is offline
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I used a feather-3 lasso on the brick areas with moire and copied them to their own layer. I then used median noise of radius 2.0 and set layer opacity to 90%. I then merged visible and increased local contrast with radius-100 unsharp mask at 20%.

Looking at it again , I see a forgot a brick layer under the roof .

Pierre
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File Type: jpg Main_house-panpan.jpg (98.3 KB, 31 views)
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Old 08-18-2005, 05:46 PM
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Gary Richardson Gary Richardson is offline
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Sorry Danny,

have tried various methods, but nothing that would give a satisfactory result with this image.

If you can scan your image, Katrin Eismann has a technique where she scans image at 4x the amount needed for final image size, then applies Gaussian Blur at different radii to the R(0.5),G(0.7) & B(1.0) channels, downsizes image by 25%, then repeats using R(0.3), G(0.5), & B(0.7), then downsizes 25%, repeat, reducing Blur Radii again, until moire has been sufficiently reduced.

Obviously could not use this technique with small image posted, so cannot say how effective this might be with your image.

Gary
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Old 08-19-2005, 05:35 AM
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Flora Flora is offline
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Hi Danny,

Welcome to RP!

I tried something very simple... with this particular picture and resolution it gave an acceptable result but, of course, it might be no help whatsoever in other 'conditions' .... It only minimized the Moire pattern, but no blurring was involved...
  • Duplicated the Background and set the Blending to 'Darken'

  • Nudged the 'Darken' Layer with the Move Tool until the worst parts had been minimized.

  • Added a Black (Hide All) Layer Mask to the Darken Layer and carefully painted white over those 'worst parts'.

  • Added a blank Layer set to 'Color' and with a soft brush (Opacity 40%), sampling colour from surrounding areas, I corrected some discolorations.

A snapshot of my workflow in Attachment 2.
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File Type: jpg F_Main_house.jpg (99.6 KB, 43 views)
File Type: jpg SNAP-0044.jpg (67.2 KB, 8 views)
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  #8  
Old 08-19-2005, 08:30 AM
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creeduk creeduk is offline
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Maybe also post a cropped full resolution version that shows the bricks close.

Flora yours looks great as usual
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  #9  
Old 08-24-2005, 03:13 AM
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DannyAustin DannyAustin is offline
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Bang on cheers guys!
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