Moire pattern?

[2Hog]

2Hog here. Occasionally I have a problem with what I will call "moire pattern". This occurs when my photo includes long straight lines as in a doorway or a deck railing. It is manifested as a stairstep effect or a motling of the doorway frame for example. Stair step is not a good description but it is all I can come up with for now. It is not something I am able to correct with Photoshop Elements 2 [as in anti aliasing]. I can sometimes get a better photo if I change angles.

I did not have this problem with my Sony Mavica - about a 1 megapixel camera. I would send example but I haven't figured out how to include photo in this message.

I would appreciate your comments. Could this be a result of using a high resolutlion G3 camera? It really is annoying.

By the way - I enjoy this forum. 2Hog

[Dana]

2Hog wrote:
I would send example but I haven't figured out how to include photo in this message.



Click the "Help" link at the top of the forum page for this and other forum help.

You have to first upload your image somewhere, e.g., to your own personal web space. You can't upload an image directly to this forum, but you can display images uploaded to other locations on the net in messages here.

If you embed a pic here in the thread using the img command, resize down to around 640x480 or less.

You can also simply put a URL in your message that goes directly the picture.

....or to a web page w/your picture like this:

http://home.san.rr.com/dawhites/g3pics.htm

Dana

[kowen]

I've only seen that happen with jpegs, not RAW mode shooting, so I'm thinking it is the compression. One thing, when I convert my RAW files to tiffs, then open in Photoshop, if they are at 25, 50 75 or 100%, you wont see the "jagged lines" or garbled letters on electric lines, names on boats, etc. If I show it at 16.6, 33.3, or 66.6% magnification, the lines will be jagged. My prints so far come out fine, no matter how I resize them.

Kerry

[marcel wouters]

Just to be shure that's it's not your display, looks your image at 100%.
If the image looks good but not at 66 or 33% this is due to the interpolation of your display!
Are you using a TFT?

[2Hog]

Need to thank Dana, Kerry, and Marcel for good suggestions. I am a bit new to photography and am just now getting past the "auto" and "P" modes.

I too have felt that my problem has to do with compression. It would be easier if the problem occurred with some consistency. Sounds odd but I also feel that lighting has a part. That doesn't compute but ??????

I had not tried the "Raw" mode until an hour ago and it is really impressive. It has been raining here in Virginia for a week. Hopefully tomorrow we will see some clearing and I can get out to take a bunch of pictures. Thank you all again - I think I am on the right track now.

2Hog

[dtrayers]

Phil Askey in his reveiw of the G3 observed what he termed "jaggies" of shallow diagonal lines.

http://www.dpreview.com/reviews/canong3/page18.asp

I think he was referring to a Moire pattern. He didn't observe it in 'everyday' shots.

[2Hog]

Dave, I believe that is it. Shallow angle jaggies as described in the Digital Review article. The one picture pretty well looks like what I have experienced. On reflection the shots were taken at shallow angles to the moired straight lines. I have an 80 foot long deck in the front of my house and when I take a photo from one end of the deck the railing is an incidental part of the picture and at an angle roughly 10 or so degrees.

Neat - thank you for the article. I will watch the angles and also experiment with the Raw mode. I have been taking shots in the fine mode. I will also try super fine to see how that helps.

Great - one question to this forum has produced a lot of interesting information and help.

Thanks Guys!