Compared to Nikon Coolpix 950, Olympus C-2020Z, Canon PowerShot S10
In all my reviews I try to present a comparison with other digicams. In these sets of sample images all the cameras were setup in exactly the same manner, had the same subjects, lighting and camera settings (as close as possible). Other Resolution charts and Colour patches now available through the camera comparison database. These three cameras were chosen as they are all 2.1mp (1600 x 1200).
Shot in daylight, Auto White Balance, EV compensation +0.3 (all cameras).
|Canon Digital IXUS (PowerShot S100)
||Canon PowerShot S10|
|Nikon Coolpix 950
Nikon and Olympus still piping Canon to the post for white balance and colour saturation, both the Digital IXUS and S10 images have fairly good white balance but noticeably less saturated colours.
We're only measuring colour here. RGB values below were taken from a VGA reduced image (to average colours and eliminate JPEG artifacts) using the Eyedropper tool in Photoshop with a 5 by 5 dropper average. (Red, Green, Blue)
Shots here are of the PIMA/ISO 12233 standard resolution test chart (more available for comparison in our comparison database). Studio light, cameras set to Auto, Exposure compensation +0.7 EV for all cameras. How to read the charts: All values are 1/100th lines per picture height. So the "10" value equates to 1000.
|Canon Digital IXUS (PowerShot 100
|Canon PowerShot S10
|Nikon Coolpix 950
Measurable findings (three measurements taken for each camera):
|Camera||Measurement||Absolute Res.||Extinction Res.|
|Canon Digital IXUS
|Canon PowerShot S10||Horiz LPH||850||1150|
|5o Diagonal LPH||700||n/a|
|Nikon Coolpix 950||Horiz LPH||750||1050|
|5o Diagonal LPH||800||n/a|
|Olympus C-2020Z||Horiz LPH||800||1100|
|5o Diagonal LPH||900||1000|
Definition of terms:
|LPH||Lines per Picture Height (to allow for different aspect ratios the measurement is the same for horizontal and vertical)|
|5o Diagonal||Lines set at 5o diagonal|
|Absolute Resolution||Still defined detail (below Nyquist frequency*)|
|Extinction Resolution||Detail beyond camera's definition (becomes a solid gray alias)|
|n/a||Not Available (above the capability of the test chart)|
|n/v||Not Visible (not visible on test results)|
image detail. Beyond the Nyquist frequency aliasing occurs.
So the Digital IXUS doesn't have the amazing sharpness and resolution of it's older brother the S10, though it's fairly comparable to the Nikon Coolpix 950 / Olympus C-2020Z of last year.
Flat area noise
The samples above are of 50 x 50 blocks cropped from the colour comparison charts above of the Medium gray patch (marked 'M'), each block is then broken down into it's red green and blue channels and reflected as such directly below.
The Digital IXUS exhibits some "speckling" of noise on what should be a flat gray block, note how much better the S10 performs. These interesting results could be related to (a) smaller CCD in the Digital IXUS and (b) switch from the CYGM colour filer array of the S10 to an GRGB colour filter array in the Digital IXUS.