Olympus C-7000 / C-70 Zoom Review
Output image file quality / JPEG artifacts
Standard Test Scene
It wouldn't be an Olympus if it didn't provide a mind boggling range of output image sizes, the C-7000 has no less than eight in combination with two compression levels. The camera organizes these into four settings; SHQ, HQ, SQ1 and SQ2. The SHQ and HQ settings are full resolution, the two SQ settings can be configured to your preference of size and compression. In addition there is also a 3:2 aspect ratio size (3072 x 2048). The C-7000 also provides uncompressed TIFF as well as RAW settings.
Below you will find crops of the same 240 x 180 portion of the center of a sequence of images taken at some of the available combinations of image size and quality. Crops shown are at 100%, saved as extremely high quality JPEG. The RAW file was converted to a TIFF using Olympus Master 1.0.
The C-7000's SHQ mode uses a very low compression setting which means no visible artifacts but also large files (typically over 4 MB at full resolution). The HQ mode appears to be a fairly big jump in compression (files now down to 1.5 MB) but even so artifacts aren't that noticeable. Again we see another good downsampling interpolation algorithm with no jaggies.
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