Olympus' Viewer 2 software provides a chance to simulate the in-camera JPEG processing using different noise filter settings and compare them to the results using Adobe Lightroom. For this comparison, I used Viewer 2 version 1.21 and Lightroom 3.5 RC. The RAW file used (available for download at the end of this post) is an ORF from my E-P3 shot at ISO 2000, 1/60s, 14mm, f/2.5. The settings in Lightroom were left completely at their defaults, including those for noise reduction and sharpening as shown below: The settings for conversion in Viewer 2 were also left completely at their defaults except for the "Noise Filter" setting. In each of the 100% crop comparisons which follow, the crops shown from left to right are: Lightroom conversion Viewer 2 conversion with Noise Filter set to "Off" Viewer 2 conversion with Noise Filter set to "Low" Viewer 2 conversion with Noise Filter set to "Standard" Viewer 2 conversion with Noise Filter set to "High" The Viewer 2 conversions should give the same results as in-camera JPEG conversions. Crop area #1: Crop area #2: Crop area #3: The effects are visible even in web-sized output. Here is a medium-sized version of the Lightroom 3 conversion: For comparison, here is the Viewer 2 (same as in-camera JPEG) conversion with Noise Filter set to "Off": Here is a mouseover (rollover) to compare the two directly. The version shown prior to mouseover is the Lightroom conversion. Mouseover for the Viewer 2 version with Noise Filter set to "Off": https://farm7.static.flickr.com/6073/6085908687_ee0313140b_b.jpg" rsrc="https://farm7.static.flickr.com/6066/6086451996_be4e6f3218_b.jpg" border="0"> The two main conclusions which I drew from this comparison were: 1) Lightroom 3 does an effective job at dealing with patchy color noise (look for red and green patches in the broad, flat black regions of the Viewer 2 conversions); 2) It is impossible to disable shadow luminance NR smearing in Olympus Viewer 2 (or in-camera JPEGs). The RAW (ORF) file is attached for you to download and try for yourself.