Sony DSC-S75 Review
Compared to... (contd.)
Colour Chart Comparison
Now we can compare the DSC-S75 to a couple of other cameras, using samples from our test archives we will now compare its image quality to the Sony DSC-S70, Nikon Coolpix 990 and Canon PowerShot G1. *U
Colour charts are shot in daylight, Auto White Balance, EV compensation +0.3 (all cameras), measured light ~10 EV.
|Sony DSC-S75||Nikon Coolpix 990|
|Canon PowerShot G1||Sony DSC-S70|
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 Average Sample Size.
Red Channel Noise
Something we noticed early on with the current crop of 3 megapixel cameras was a certain amount of noise in the red channel, even at normal shutter speeds. 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. *U
As you can see the S75 and S70 both have a little red in their blue channel (a little more so for the S75), therefore some visible "red channel noise" would be seen in any large blue areas of an image (such as blue sky, a common complaint) it's also worth noting the intensity and purity of the blue channel indicating a far cleaner and more saturated blue response (as we saw above).
UPDATE 25/May/2001: There seems to have been some debate on this issue on our Sony Talk forum as to the amount of visible red channel noise on the S75 compared to the S70. My only additional comment would be that the S75 does seem to boost colours a little more than the S70 did which would of course lead to more visible colour noise.
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 1/100 th lines/picture height/width. So the "10" value equates to 1000. *U
|Nikon Coolpix 990|
|Canon PowerShot G1|
Measurable findings (three measurements taken for each camera):
|Camera||Measurement||Absolute Res.||Extinction Res.|
|5o Diagonal LPH||1000||n/a|
|5o Diagonal LPH||900||n/a|
|5o Diagonal LPH||900||n/a|
|5o Diagonal LPH||1000||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.
As we'd expected, the S75 sits up their with it's older brother for absolute resolution, whatever Sony have in the combination of lens and image processing they've managed once more to produce some of the highest resolution we've seen on a 3 megapixel consumer digital camera, absolute resolution well into 1000 lph and detail only disappearing (extinction resolution) at around 1400 lph. *U
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