Previous page Next page

JPEG/RAW Image Size & Quality

The G2 provides four image size options in combination with three JPEG quality settings. On top of this you have the uncompressed, unprocessed RAW file which is simply a pixel by pixel readout of the CCD (10-bits per pixel).

Standard Test Scene

To give an impression of what some of the combinations of image size and quality produce the table below is a cross reference of some of them:

  • 2272 x 1704 RAW
  • 2272 x 1704 Super-Fine
  • 2272 x 1704 Fine
  • 2272 x 1704 Normal
  • 1600 x 1200 Super-Fine
  • 1600 x 1200 Fine
  • 1024 x 768 Super-Fine
  • 640 x 480 Super-Fine

Images below are cropped 240 x 100 area of the image magnified 200% (nearest neighbour).

2272 x 1704
3,200 KB (Canon RAW - .CRW)

2,129 KB

1,317 KB

614 KB

1600 x 1200

1,117 KB

698 KB

1024 x 768


479 KB

640 x 480


215 KB

Clearly Super-Fine JPEG provides a high quality image with virtually no visible artifacts. Moving down to Fine and we can just about make out the beginnings of some JPEG artifacts but they're pretty few and far between, this setting would probably be the best trade off between quality and storage space.

ISO (Sensitivity) Adjustment

ISO equivalence on a digital camera is the ability to increase the sensitivity of the CCD to allow for faster shutter speeds and/or better performance in low light. The way this works in a digital camera is by "turning up the volume" on the CCD's signal amplifiers, nothing is without its price however and doing so also amplifies any noise that may be present and often affects colour saturation.

The G2 features four selectable ISO sensitivities of 50, 100, 200 and 400 as well as the same Auto mode we saw on the G1 (which varies sensitivity between ISO 50 and 100 depending on available light).

Good light (10 EV) Low light (3 EV)
ISO 50 ISO 50
ISO 100 ISO 100
ISO 200 ISO 200
ISO 400 ISO 400

As we'd expect the G2's ISO 50 appears very clean, there's just the hint of some noise but nothing visible. ISO 100 does increase the noise levels slightly, they appear as coloured mottle and dark/light texture highlights. ISO 200 is usable, ISO 400 seems to me to be a little too noisy to be useful at full resolution (though obviously if you were to sample this image down in size some of the noise would average out).

Previous page Next page
I own it
I want it
I had it
Discuss in the forums



G2 was my first digital, which produced thousands of excellent pictures.
I wanted an SLR again so bought a Rebel T1i in 2010.
Later wanted a smaller camera, tried out a Canon SD1200 but poor usability and very poor image quality. I bought a Nikon S6200 which takes very good pictures, but suffers the ills of a small, cheap camera.
June 2014 I didn't want to pack my SLR to Europe, so after researching I chose a Powershot G16 over a Fuji X20 and Panasonic ZS40. VERY pleased with the G16!
Now to Dec 2014. Bought a Canon EF 24-105 L IS USM for my Rebel. Looks impressive, but after a day taking pictures and comparing results, the G16 is so good, in fact, for outdoors, side by side image quality in many cases is as good or better than the Rebel! Maybe my Rebel is getting tired?
IMO, unless photography is your living, the only benefit of a SLR is the picture taking experience (which is significant) and to show off your fancy camera and lenses. Otherwise, a high end compact is sufficient.

1 upvote