Canon PowerShot SD100 (Digital IXUS II) Review
Compared to... (contd.)
Here we will use our standard color and resolution charts to compare the Pentax Optio S to the Canon PowerShot SD100 (Digital IXUS II), Casio EXILIM EX-Z3 and Nikon Coolpix SQ. Note that both the Pentax Optio S and Casio EXILIM EX-Z3 needed +0.7 EV exposure compensation (compared to our normal +0.3 EV) to accurately expose our standard color chart comparison (below).
Color Chart Comparison
Color charts are shot in daylight, Auto White Balance, Canon & Nikon +0.3 EV compen. / Pentax & Casio +0.7 EV compen. This test is also reliant on the accuracy of the camera's auto white balance, the color charts are shot in daylight but some camera's white balance is better than others. All cameras are given 20 seconds for their white balance systems to settle before the shot is taken (often we will take up to eight shots and select the 'average' AWB result).
|Canon PowerShot SD100||Pentax Optio S|
|Casio EXILIM EX-Z3||Nikon Coolpix SQ|
In the table below we're only measuring color. The RGB values were measured from a VGA reduced image (to average colors, remove noise and eliminate JPEG artifacts) using the Eyedropper tool in Photoshop with a 5 by 5 Average Sample Size.
The SD100's automatic white balance performed well with near perfect gray and white patches. Overall color balance was good with a fairly equal response to each color and little 'channel bleed' into the pure color patches.
Shots here are of the PIMA/ISO 12233 standard resolution test chart (more of which are available in our comparison database). This resolution chart allows us to measure the actual performance of the lens and sensor system. It measures the ability of the camera to resolve lines at gradually higher resolutions and enables us to provide a definitive value for comparison purposes. Values on the chart are 1/100th lines per picture height. So a value of 8 equates to 800 lines per picture height.
Studio light, cameras set to auto, all settings factory default. Exposure compensation +0.7 EV for all cameras (to compensate for the white background). Click on the camera name below the crops to download the full resolution chart (large JPEG's).
|Horizontal resolution||Vertical resolution||5 degree diagonal res.|
|Canon PowerShot SD100 (1,210 KB)|
|Pentax Optio S (1,754 KB)|
|Casio EXILIM EX-Z3 (1,589 KB)|
|Nikon Coolpix SQ (1,330 KB)|
Measurable findings (three measurements taken for each camera)
|Camera||Measurement||Absolute Res.||Extinction Res.|
|Canon PowerShot SD100||Horizontal LPH||1100||1300|
|Vertical LPH||1000||* 1300|
|5° Diagonal LPH||# 900||n/a|
|Pentax Optio S||Horizontal LPH||1000||* 1250|
|Vertical LPH||950||* 1200|
|5° Diagonal LPH||# 900||n/a|
|Casio EXILIM EX-Z3||Horizontal LPH||1000||* 1250|
|Vertical LPH||950||* 1200|
|5° Diagonal LPH||900||n/a|
|Nikon Coolpix SQ||Horizontal LPH||1100||* 1350|
|Vertical LPH||1000||* 1350|
|5° Diagonal LPH||# 900||n/a|
* Moiré is visible, + Chart maximum, # Jagged diagonals
Definition of terms
|LPH||Lines per Picture Height (to allow for different aspect ratios the measurement is the same for horizontal and Vertical)|
|5° Diagonal||Lines set at 5° 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.
The SD100 delivered as much resolution as we would expect from a three megapixel digital camera, it also carried detail through to a fairly respectable level, although not quite as far as the Nikon Coolpix SQ. Where the SD100 did seem to be better was keeping moiré artifacts at a minimum.
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