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Compared to... Canon PowerShot A640

Below you will find a studio comparison between the Canon PowerShot G7 and the PowerShot A640 at ISO 400.

Studio scene comparison ( @ ISO 400)

  • Canon PowerShot G7: Aperture Priority mode, ISO 400, Default Image Parameters,
    Manual white balance, +0.67 EV compensation
  • Canon PowerShot A640: Aperture Priority mode, ISO 400, Default Image Parameters,
    Manual white balance, +0.67 EV compensation
     
  • Lighting: Daylight simulation, >98% CRI
Canon PowerShot G7
Canon PowerShot A640
ISO 400, 1/320 sec, F5
ISO 400, 1/250 sec, F5.0
3,920 KB JPEG
5,111 KB JPEG

At ISO 400 the difference is slightly more visible - again we presume this to be down to the DIGIC III vs DIGIC II processor, as the cameras almost certainly have exactly the same sensor. The G7 result is slightly less noisy (there is visibly less chroma noise in the shadows), and the noise reduction has had a negligible effect on high contrast detail. It's interesting to note that there does appear to be a little more low contrast detail lost (looking at the watch face), thanks to the G7's stronger noise reduction. Also interesting is that the G7 appears to be slightly more sensitive at ISO 400 than the A640 (just under half a stop). Both cameras have excellent contrast, saturation and color - a couple of years ago ISO 400 meant a much muddier looking result.

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