Canon PowerShot A20 Review
Compared to... (contd.)
Colour Chart Comparison
Now we can compare the PowerShot A20 to a couple of other cameras, using samples from our test archives we will now compare its image quality (colour and resolution) to the Canon Digital IXUS 300 (S300 ELPH) , Sony MVC-CD200 and Nikon Coolpix 950.
Colour charts are shot in daylight, Auto White Balance, EV compensation +0.3 (all cameras), measured light ~10 EV.
|Canon PowerShot A20||Canon Digital IXUS 300|
|Sony MVC-CD200||Nikon Coolpix 950|
In the table below we're only measuring colour. The RGB values were measured from a VGA reduced image (to average colours and eliminate JPEG artifacts) using the Eyedropper tool in Photoshop with a 5 by 5 Average Sample Size.
As we saw with the IXUS 300 the A20 also exhibits "dull blues", otherwise colours are relatively accurate (especially for an "entry level" digital camera) and bright. White balance is also very good.
Red Channel Noise
Something we've commented on previously is noise in the red colour channel in what should be pure blues. This was most visible in the light blue of skies or painted walls. Our colour patch test chart turned out to be a good "leveller" and a way to measure the performance of one camera to the next.
The samples below are of 40 x 40 blocks cropped from the colour comparison charts above of the Blue and Cyan patches, each block is then broken down into it's red green and blue channels and reflected as such directly below.
The A20 exhibits good channel separation (colour purity) and even less noise in the red channel than we saw from the IXUS 300 (interesting). A commendable performance.
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, Exposure compensation +0.7 EV for all cameras.
|Canon PowerShot A20|
|Canon Digital IXUS 300 (S300 ELPH)|
|Nikon Coolpix 950|
Measurable findings (three measurements taken for each camera):
|Camera||Measurement||Absolute Res.||Extinction Res.|
|Canon PowerShot A20||Horiz LPH *||820||1000|
|5° Diagonal LPH||800||900|
|Canon Digital IXUS 300||Horiz LPH *||820||1000|
|5° Diagonal LPH||800||900|
|Sony MVC-CD200||Horiz LPH *||850||1050|
|5° Diagonal LPH||800||900|
|Nikon Coolpix 950||Horiz LPH||750||1050|
|5° Diagonal LPH||800||n/a|
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.
Despite the appearance of higher resolution in our previous comparison the A20 shows exactly the same resolution as the IXUS 300 (which is what we'd expect after all). The A20 also exhibts some moire pattern at higher frequencies, which although they didn't show up in any of our samples, should be considered. Resolution is along the lines of what we'd expect from a 2 megapixel digital camera.
|Hot Air Balloons Over Bagan by User9320321874|
|Blue mood by darub|
from Fixed lens shootout.
|Yellow Warbler by LeeS|
from A Big Year - birds
|Waiting for the Parade by tcoker1103|
from - La Vida Loca - (Black and White Street Photography+ A Border)
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