Olympus E-P3 JPEG vs RAW

July 7, 2011 | Zoltan Arva-Toth | Compact System Camera | 7 Comments | |
Olympus E-P3 JPEG vs RAW Image

Last week we published 36 sample images taken with the new Olympus E-P3 compact system camera in Large SuperFine JPEG+RAW format. So far neither Olympus nor any of the major third-party software developers have updated their raw converters to support the new camera; but as we have found out, RawTherapee is capable of opening, editing and converting the E-P3 ORF files.

Below you can find a comparison of some out-of-camera JPEGs and ORFs developed with RawTherapee, with noise reduction turned off. Do note that without a dedicated Olympus E-P3 camera profile available, it is not possible to recreate the exact colours of the camera-original JPEGs, but that is not the main focus of this comparison anyway.

Low-ISO Comparison

First and foremost, we were interested in seeing if there were any major differences in sharpness and detail at low ISO settings. Some of you have expressed disappointment at the level of detail seen in the out-of-camera JPEGs, even though we made a point of shooting the samples with the Noise Filter set to “Off” and in-camera sharpening left at its default level. We therefore thought it would be worth checking what you could eke out of the raw files using currently available software.

Our first sample photo was taken using the new 12mm f/2 lens  at a sensitivity setting of ISO 200 and aperture of f/8. This is a sharp, high-grade prime lens, and the image was captured at a fast shutter speed, meaning any blurring attributable to camera or subject movement is out of the question.

First, the full frame - JPEG on the left, raw conversion on the right.

Olympus E-P3 Raw vs JPEG

What’s immediately obvious here - aside from the differences in colour - is that lens distortion is auto-corrected in the out-of-camera JPEG, while the image converted with RawTherapee is uncorrected. This is most easily noticed in the row of buildings in the background. Of course this distortion correction robs you of some field of view - you can see how the image converted from raw gets a little bit more of the scene in - and alters somewhat the size and shape of individual image details, as evidenced in the crops below.

Let’s now move on to the assessment of sharpness and detail at 100% magnification. (Again, JPEG - left, raw - right.)

Olympus E-P3 Raw vs JPEG Olympus E-P3 Raw vs JPEG

The camera-original JPEG shows considerably higher contrast, while the raw conversion has arguably better tonality. The leaves in the background are better defined in the RawTherapee conversion, while the orange shoulder strap appears to hold more detail in the OOC JPEG.

Olympus E-P3 Raw vs JPEG Olympus E-P3 Raw vs JPEG

This crop, taken from the bottom-left part of the photo, shows how much the in-camera distortion correction alters the size and shape of image elements near the borders of the frame - but more importantly, it also demonstrates differences in the appearance of shadow noise at low ISO settings. There’s a bit of luminance noise in the JPEG, while the raw conversion has some tightly-grained chroma noise. This difference is probably attributable to different interpretations of the binary image data by the in-camera JPEG engine and RawTherapee.

Olympus E-P3 Raw vs JPEG Olympus E-P3 Raw vs JPEG

These crops, taken from the centre of the image, appear to show that there is more detail in the raw files than what you can see in the OOC JPEGs. How much of this is actual detail remains open for debate, but we it’s clear that the image converted from raw would produce a crisper print at large sizes.

Our second low-ISO sample was taken with the 14-42mm lens at the 14mm end, sensitivity of ISO 200 and aperture of f/5.6.

Olympus E-P3 Raw vs JPEGOut-of-camera JPEG

Olympus E-P3 Raw vs JPEGImage converted with RawTherapee

The above pair of images show the effect of in-camera lens distortion correction even more dramatically (which is no wonder given that a kit zoom at the wide end is expected to have more distortion than a high-end prime).

Olympus E-P3 Raw vs JPEG Olympus E-P3 Raw vs JPEG
Olympus E-P3 Raw vs JPEG Olympus E-P3 Raw vs JPEG
Olympus E-P3 Raw vs JPEG Olympus E-P3 Raw vs JPEG

These crops lead more or less to the same conclusions drawn from the previous pair of pictures - you can definitely achieve much crisper-looking results by shooting raw, but the actual amount of detail may not be that much higher, and you may also run into aliasing issues.

Entry Tags

compact system camera, mirrorless, RAW, micro four thirds, JPEG, pen, compare, comparison, ep3, e p3, Olympus E-P3, raw therapee

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#1 BJN

“These crops lead more or less to the same conclusions drawn from the previous pair of pictures - you can definitely achieve much crisper-looking results by shooting raw, but the actual amount of detail may not be that much higher, and you may also run into aliasing issues.”

That’s a rather sweeping statement based on using one fringe raw converter. Aliasing vs. detail isn’t a jpeg vs. raw issue, it’s an image processing issue and with many converters the balance can be controlled by the user.

Your crops all show significantly finer detail in the raw conversions, I don’t know how you can dismiss that. And when the major conversion tools are updated to support this camera, lens correction will be built in. One advantage to a fringe converter is that it can show real lens performance since the developer isn’t obligated to automate correction as Olympus and Panasonic require for access their raw file encoding.

6:56 pm - Thursday, July 7, 2011

#2 John Wilson

???? What is the purpose of this exercise?

Jpgs are a processed file. The RAW files are not at this stage, so this is nothing less than comparing apples and oranges. You said it yourself, until there’s a suitable RAW converter available we don’t know how the RAW files will really look in processed form. So what have we learned???

7:35 am - Friday, July 8, 2011

#3 Rob

..we have learned two things: first of all, even with a M4/3 camera it’s better to shot jpeg+RAW for serious result; the second though it’s about image quality: if you’re using a high quality prime lens, you gain much more detail shooting in RAW, without worrying about lens distortion. The problem, as stated in the test, is about chroma noise inside shadows area, and local contrast, which seems the camera jpeg engine tend to boost it a lot. To me appear as precious infos, as far as I’m interested in buying an Oly M4/3 (Probably the E-PL3).

10:42 am - Friday, July 8, 2011

#4 Daemonius

It works, cause its based on DCraw. Olympus unlike Panasonic didnt invent for E-P3 some new format or different coding, so its basically same RAW as in E-P1 or E-P2.

It shows everything it should, more detail (cause its RAW), not corrected, more chroma noise (cause its eliminated via in camera JPEG). Contrast curve is different, but you can fix that easily (thats same for pretty much every m4/3s).

Simply put, E-P3 is decent improvement over previous E-Ps. Thats all (plus very fast AF :D). Its still crap, if you want clean sky at base ISO and if you dont like dwarfed perspective (or look) from photo.

No suprises at all.

8:02 pm - Saturday, July 9, 2011

#5 Jose Jimenez

Bottom line seems to be that in the real world there is no real advantage to shooting RAW, unless you like the idea of high-ISO noise. You’ll find far more variation in individual cameras and operator skill and/or error will have a far greater impact on the final picture than any differences between RAW and jpeg.

2:02 am - Friday, August 26, 2011

#6 Tim Fernando

I’ve just written a comparison of Apple camera RAW vs the E-P3’s JPEGs at http://posterous.timfernando.com/67952159

Hope that may help some folks!

1:12 pm - Sunday, September 4, 2011

#7 mike

I’ve tried both Rawtherapee & UFRaw.
Although I’m not convinced either are eventually better than Tiff files, Rawtherapee appears better than UFRaw both in functions & quality of end result.
My big problem with Rawtherapee is it appears/does render my photos from 99.34 x 74.51 cm to 23.91 x 17.86 cm whereas UFRaw doesn’t?
There is no help at all just join the forum.
Any comments on how to import RAW & keep original size would be most welcome.


12:33 pm - Thursday, February 5, 2015