Nikon Coolpix 4500 Review
Compared to... (contd.)
Now we'll compare the Nikon Coolpix 4500 to a few other cameras from our test archives. Here we're comparing colour and resolution to the Canon PowerShot G2, Sony DSC-S85 and Minolta DiMAGE S404.
Colour Chart Comparison
Colour charts are shot in daylight, Auto White Balance, EV compensation +0.3 (all cameras), measured light ~10 EV. This test is also dependent on the accuracy of the camera's auto white balance, the colour charts are shot in daylight but some camera's white balance is better than others. All cameras are given 20 seconds to "settle" before the shot is taken.
|Nikon Coolpix 4500||Canon PowerShot G2|
|Sony DSC-S85||Minolta DiMAGE S404 (Resaved as sRGB)|
In the table below we're only measuring colour. The RGB values were measured from a VGA reduced image (to average colours, remove noise and eliminate JPEG artifacts) using the Eyedropper tool in Photoshop with a 5 by 5 Average Sample Size.
As you can see the Coolpix 4500 has a very similar colour response to the G2 albeit with slightly lower saturation (this can easily be increased if you prefer). The 4500's black point is also about half way between the G2 and the other cameras, this is a good balance between images which look too flat and loosing information at the darker end of the greyscale. (Note: Unlike some early adopters of the camera I don't see, nor have I seen in my samples, a problem with reds and the Coolpix 4500).
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.
|Horizontal resolution||Vertical resolution||5 degree diagonal res.|
|Nikon Coolpix 4500|
|Canon PowerShot G2|
|Minolta DiMAGE S404|
Measurable findings (three measurements taken for each camera):
|Camera||Measurement||Absolute Res.||Extinction Res.|
|Nikon Coolpix 4500||Horiz LPH||* 1200||* 1350|
|5° Diagonal LPH||1000||n/a|
|Canon PowerShot G2||Horiz LPH||1250||* 1450|
|Vert LPH||1200||* 1500|
|5° Diagonal LPH||1000||n/a|
|Sony DSC-S85||Horiz LPH||1250||* 1650|
|5° Diagonal LPH||1000||n/a|
|Minolta DiMAGE S404||Horiz LPH||* 1150||* 1350|
|Vert LPH||* 1100||* 1350|
|5° Diagonal LPH||800||n/a|
* Moiré is visible
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 Coolpix 4500 exhibits good horizontal resolution but less vertical resolution than we would have hoped for. That said it does so without any noticeable artifacts and only some mild moiré on the horizontal resolution bars. Note the difference between the way the G2 has over-sharpened the 5 degree diagonal patch and the way the 4500 reproduces the same area.
Aug 16, 2002
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