Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
07-03-2014, 04:14 AM   #1
New Member

Join Date: May 2014
Posts: 11
K5IIs moire question

Hey all,

In the last batch of photos I uploaded from my camera was a picture of my mailbox. I shoot in raw (DNG) and use Lightroom 3 to edit and manage my photos. The mailbox picture looked fine as shot in Lightroom 3, so I exported a JPEG. But when I opened the JPEG copy, I noticed significant moire on the mailbox. The picture uploaded in Lightroom, however, shows no moire whatsoever. I then exported a DNG version of the image, opened it in PS Elements 6 and the moire does not appear.

What is it about exporting a JPEG that makes the moire appear? Is there a way I can tell when there is going to be a moire issue before exporting the JPEG?

Thanks for any advice!

07-03-2014, 04:27 AM   #2
MadMathMind's Avatar

Join Date: Dec 2013
Location: Houston, TX
Photos: Gallery
Posts: 1,641
Moire occurs when an object has a pattern that is finer than the resolution (not necessarily pixel count) of the image or display. If you look at an image on the camera's viewscreen, for instance, you may see moire, but when you open the file on your computer, it's gone. Moire can be an artifact of the display just as much as the image itself.

In this case, you are losing resolution when you compress to JPEG. High-frequency information is discarded or reduced in compression, which means the fine details are lost. That's where your moire is probably coming from. Save it at max quality and you may not see it.
07-03-2014, 06:54 AM   #3

Join Date: Sep 2009
Location: Southern California
Photos: Gallery | Albums
Posts: 3,181
And try saving at Max (original) resolution, if you're not already.
07-03-2014, 09:42 AM   #4
New Member

Join Date: May 2014
Posts: 11
Original Poster
Thanks for the advice, guys!

It appears you're right, MadMathMind, that this is a display issue. I went back and realized that I wasn't the viewing the image at full/actual size. I then selected to view at "actual size" and POOF, the moire disappeared.

I'm glad this turned out to be a non-issue


  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, dng, dslr, jpeg, k-5, k-5 ii, k-5 iis, k5, lightroom, mailbox, pentax k-5, photos, picture
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Moire - K5IIs , K3 owners only hjoseph7 Pentax DSLR Discussion 12 07-20-2014 10:17 PM
Moire or IQ that is the question Lorrie61 Pentax K-5 5 05-25-2013 01:30 AM
K5IIs No Moire, but false color? LRB21 Pentax K-5 13 12-14-2012 03:43 PM
Excellent K5IIs Review - Moire & Diffraction interested_observer Pentax K-5 2 11-16-2012 11:08 AM
A K5IIs pic and Moire David&karen Pentax K-5 9 11-07-2012 03:46 AM

All times are GMT -7. The time now is 12:48 AM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]