Olympus E-500 EVOLT Review
Output image file quality / JPEG artifacts
Standard Test Scene
Below you will find 200% magnified crops of the same 240 x 100 portion of the center of a sequence of images taken at full size but different output settings. The RAW file was converted to a TIFF using Olympus Master 1.3.
|3264 x 2448 TIFF (Uncompressed) - 23,902 KB .TIF (not for download) (VGA TIFF crop)|
|3264 x 2448 RAW (Uncompressed) - 13,797 KB .ORF (not for download) (VGA TIFF crop)|
|3264 x 2448 JPEG SHQ (1/2.7) - 5,289 KB .JPG|
|3264 x 2448 JPEG HQ (1/4) - 4,181 KB .JPG|
|3264 x 2448 JPEG HQ (1/8) - 1,807 KB .JPG|
As we've seen on previous Olympus cameras the SHQ JPEG is as good as lossless and makes the TIFF option pretty redundant (you'll be hard pushed to see a difference). The optimum mode is probably HQ at the 1/4 setting which delivers files of around 4 MB with virtually not artifacts at all. Higher compression than this (1/8 or 1/12 settings) do lead to some JPEG artifacts, especially around detail edges.
The E-500 provides the independent selection of output color space, you can select from sRGB or Adobe RGB. Via the menus this is buried on the second setup menu, with the control panel display enabled you can press OK and access it as a shortcut.
Images taken in the Adobe RGB color space have their filename prefixed with an underscore (_) this complies with DCF 2.0 (Exif 2.21)*. It looks as though Olympus has fixed the color space issue we discovered in our E-300 review, color response is virtually identical between the two modes (apart from Adobe RGB offering a wider gamut). Place your mouse over the label to see a ColorChecker chart shot in the respective mode.
|sRGB||Adobe RGB (converted to sRGB)|
* This has nothing in particular to do with Olympus but this renaming system makes it difficult to keep your images in the correct order if you don't routinely rename them by date/time.
Color space: CIE u'v' Color Distribution chart
Note that in these samples the Adobe RGB image has not been converted to sRGB and so to view it correctly you will have to load it into a color space aware photo application and assign the Adobe RGB color space. Below each sample is the CIE u'v' Color Distribution chart; larger gray triangle approximately represents the range of color which the human eye can resolve, the inner triangle the available gamut in each color space (sRGB or Adobe RGB).
- Canon EOS M58.8%
- Panasonic G85/G803.3%
- Panasonic FZ2500/FZ20001.9%
- Panasonic LX10/LX151.2%
- Panasonic GH5 development3.6%
- Sony a99 II15.9%
- Nikon KeyMission 170 and 801.0%
- Fujifilm GFX 50S development28.3%
- Olympus E-M1 II development18.7%
- Olympus E-PL80.1%
- Olympus 25mm F1.2 Pro1.5%
- Olympus 12-100mm F4 IS Pro1.9%
- Olympus 30mm F3.5 Macro0.1%
- Sigma 85mm F1.4 Art3.6%
- Sigma 12-24mm F4 Art2.6%
- Sigma 500mm F4 DG OS HSM Sport2.4%
- YI M12.2%
- GoPro Hero50.8%
- GoPro Karma drone2.2%
|Sunflower Field by GrannyMeg|
from An impressionist piece
|Flag from Staten Island Ferry by wam7|
|Windswept juniper by Kreber|
from Wind power
|SAND SCULPTURE by duskman|
from Landscape - Black and White #4