Minolta DiMAGE 7i Review
Here we can compare, using results from our review archives, the colour reproduction and resolution of the Minolta DiMAGE 7i to three other five megapixel digital cameras: Sony DSC-F707, Nikon Coolpix 5000 and Olympus E-20.
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.
|Minolta DiMAGE 7i||Sony DSC-F707|
|Nikon Coolpix 5000||Olympus E-20|
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 DiMAGE 7i has a fairly neutral colour balance with no preference given to any particular colour and fairly mild colour saturation. Remember that if you prefer more vivid colour output you can simply increase the colour saturation setting to +1, +2 or +3.
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.|
|Minolta DiMAGE 7i|
|Nikon Coolpix 5000|
Measurable findings (three measurements taken for each camera):
|Camera||Measurement||Absolute Res.||Extinction Res.|
|Minolta DiMAGE 7i||Horiz LPH||* 1300||1450|
|Vert LPH||* 1150||1450|
|5° Diagonal LPH||900||-|
|Sony DSC-F707||Horiz LPH||1450||1800|
|5° Diagonal LPH||+ 1000||-|
|Nikon Coolpix 5000||Horiz LPH||* 1350||1500|
|Vert LPH||* 1200||1500|
|5° Diagonal LPH||+ 1000||-|
|Olympus E-20||Horiz LPH||* 1350||1650|
|Vert LPH||* 1300||1650|
|5° Diagonal LPH||+ 1000||-|
* Moiré becomes visible, + Chart maximum
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.
Not surprisingly the DiMAGE 7i produced identical resolution to the DiMAGE 7. This places it just below the Coolpix 5000 and quite a way away from the DSC-F707 which now seems to be even more remarkable in its ability to make the most from that five megapixel sensor. It's a shame that Minolta didn't use this update as an opportunity to improve image resolution (which is clearly a function of the camera's Bayer interpolation, the lens is good enough).
|Waffles with fruits by Coolinarka|
from Food photography (desserts)
|Vestrahorn Frozen Reflection by Will B Milner|
from Ice cold
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