pesky moire pattern

[cleamon]

Not sure if this is the correct forum for this question.

I have some images that display a moire pattern when viewed less than full size ( +/- 3200x4800). The only techniques I've seen for correcting this, also cause the affected area(s) of the image to be blurry. Blurring out the pattern is not an option in my opinion.

Does anyone have a technique (PS or otherwise) for handling this? Or is it not a concern. Will the pattern appear in the printed photo as well if I print at a smaller resolution?

Thanks

[sk66]

Are you talking about a "pixelation" type appearance or the "wavyness"/banding that sometimes occurs in graduated areas?

If it's the banding and not apparent in the full size image, it will not print.
I don't know how to do anything about it when it is scaled. I've only seen this if it's a "scale upon view" type selection (flickr) on the web. I haven't seen this problem when worrking on my own machine.

[cleamon]

Originally Posted by sk66

Are you talking about a "pixelation" type appearance or the "wavyness"/banding that sometimes occurs in graduated areas?

If it's the banding and not apparent in the full size image, it will not print.
I don't know how to do anything about it when it is scaled. I've only seen this if it's a "scale upon view" type selection (flickr) on the web. I haven't seen this problem when worrking on my own machine.

I wouldn't describe it as either. It's more like in this image:



except of course it's part of the scene (a wooden structure) and only appears when viewing at less than full size.

[sk66]

The light band across the center? That's the banding I'm talking about.
Maybe post a screen capture of what you are talking about...

[dcclark]

If you don't see it at full size, then this is almost certainly a result of your editing/viewing software, and how it displays scaled-down images. That means that when you print the image (or even view it in different software), the moire shouldn't show up.

[cleamon]

Originally Posted by sk66

The light band across the center? That's the banding I'm talking about.
Maybe post a screen capture of what you are talking about...

OK, I guess I misunderstood your description. I'll try to embed some screen grabs here. First, a 33% sized portion, then a full size one.
As you can see in the 33% grab, the shingles and clapboard siding both display the moire pattern. The full size does not. My concern is that when I send this to a lab for printing ($$$), I'm going to see this pattern.

[OsmosisStudios]

Just the way your software/OS renders that pattern at given magnification levels. Generally software does better with nice "round" numbers (100%, 50%, 25%, etc) and does poorly with odd numbers (37%, 66%).

Your example shows a bad (33%) and a good (100%).

Its not the image thats like that, just the way it's shown on screen at that zoom. Not to worry.

[milosh]

Originally Posted by OsmosisStudios

Just the way your software/OS renders that pattern at given magnification levels. Generally software does better with nice "round" numbers (100%, 50%, 25%, etc) and does poorly with odd numbers (37%, 66%).

Your example shows a bad (33%) and a good (100%).

Its not the image thats like that, just the way it's shown on screen at that zoom. Not to worry.

Exactly, I think that's called anti-aliasing.

When you view a photo at 100%, each photo pixel is represented by one screen pixel. When you view it at 200%, one photo pixel is represented by four screen pixels (two horizontally and two vertically). When you view it at 50%, four photo pixels are represented by one screen pixel, etc. But when you view it at any other magnification level which is not an integral multiple of 100 (25, 50, 200, percent, etc.), the software has to "make up" pixels (the screen can't use half a pixel). Viewing them at these "proper" mag. levels should solve it. If not, don't worry, that's just how your display, well, displays them.