Overall Rating:


Canon PowerShot G12



Price as Reviewed:


One of Canon’s PowerShot G series of compact cameras has won the AP Enthusiast Compact of the Year Award for the past three years. Could the new PowerShot G12 make it four years in a row? Richard Sibley investigates

Noise, Resolution and Sensitivity

Image: Although JPEG images are very good, the level of detail and sharpness is noticeably better by saving and editing the raw files

As the PowerShot G12 keeps the same 10-million-pixel sensor as its predecessor, the image quality is virtually identical. Our resolution chart shows that the camera is capable of resolving to around 24 when the sensitivity is set to ISO 80 and ISO 100, which is on a par with many 12-million-pixel DSLRs. Although the detail resolution does gradually fall, even at ISO 3200 it is still able to resolve around 18 on the chart.

Image: For a 10-million-pixel camera, the PowerShot G12 captures a high level of detail

In real terms this means images are full of detail at lower sensitivities. However, there is some loss of detail as sensitivities increase due to the effects of noise and noise reduction – for instance, images have a smudged appearance, but also appear to have had edge sharpening applied. This maintains edge fidelity, but larger textured areas lose some detail.

The result of the noise reduction is that while detail is lost, chroma noise is kept to a bare minimum, with just the occasional hint of green or magenta patches in shadow areas. Luminance noise is reduced less and it takes on a speckled appearance. However, given the size of the sensor and the pixel count, it is kept to a minimum and images are still usable even at the highest sensitivities.

Resolution charts: These images show 72ppi (100% on a computer screen) sections of images of a resolution chart, captured at the long end of the zoom (100mm). We show the section of the resolution chart where the camera starts to fail to reproduce the lines separately. The higher the number visible in these images, the better the camera’s detail resolution is at the specified sensitivity setting.

  • Video: Yes, up to 1280x720-pixel HD at 24fps
  • AF Assistance: Yes
  • White Balance: Auto, 7 presets, plus 2 custom
  • Built-in Flash: Yes
  • Memory Card: SD/SDHC/SDXC
  • Viewfinder Type: Yes
  • Output Size: 3648x2736 pixels
  • LCD: 2.8in LCD with approx 461,000 dots (153,600 pixels)
  • Exposure Modes: Auto, program, aperture priority, shutter priority, manual, 2 custom modes and 16 scene presets
  • Hotshoe: Yes
  • Max Flash Sync: Up to 1/2000sec
  • Sensor: CCD with 10 million effective pixels
  • Weight: 401g (including battery and memory card)
  • Power: Rechargeable Li-Ion battery NB-7L
  • Lens: Canon 5x zoom lens, 28-140mm (equivalent) f/2.8-4.5
  • File Format: JPEG, raw or raw + JPEG
  • Shutter Speeds: 15-1/4000sec in shutter priority and manual mode
  • Colour Space: sRGB
  • Drive Mode: Single and continuous. Approx 1.1fps maximum in continuous
  • ISO: 80-3200
  • Dimensions: 112.1x76.2x48.3mm
  • DoF Preview: No
  • Focusing Modes: Manual, single AF, continuous AF, face detection
  • Metering System: Evaluative, centreweighted average and spot (can be linked to active AF point or face detection)
  • Connectivity / Interface: USB
  • Exposure Comp: ±2EV in 1/3EV steps
  • Compression: Fine, Normal
  • RRP: £569

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