Minolta DiMAGE A1 Review
Here we will use our standard color and resolution charts to compare the Minolta DiMAGE A!, Canon PowerShot G5, Fujifilm FinePix S7000 Zoom and Sony DSC-F717.
Color Chart Comparison
Color charts are shot in daylight, Auto White Balance, +0.3 EV exposure compensation (except the DiMAGE A1 which required +0.7 EV exposure compensation to achieve the same tone balance). 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).
|Minolta DiMAGE A1||Canon PowerShot G5|
|Fujifilm FinePix S7000||Sony DSC-F717|
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.
As you can see the DiMAGE A1 produced a color response quite similar to the Canon PowerShot G5. It's worth remembering that you do have a wide degree of control over both color and tonal response with the DiMAGE A1, as well as the choice to shoot in the Adobe RGB color space.
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.|
|Minolta DiMAGE A1 (2,489 KB)|
|Canon PowerShot G5 (1,985 KB)|
|Fujifilm FinePix S7000 @ 6mp (1,656 KB)|
|Sony DSC-F717 (2,040 KB)|
Measurable findings (three measurements taken for each camera)
|Camera||Measurement||Absolute Res.||Extinction Res.|
|Minolta DiMAGE A1||Horizontal LPH||* 1300||* 1450|
|Vertical LPH||* 1150||* 1450|
|5° Diagonal LPH||900||n/a|
|Canon PowerShot G5||Horizontal LPH||1450||* 1650|
|Vertical LPH||1350||* 1700|
|5° Diagonal LPH||+ 1000||n/a|
(@ 6 mp output size)
|Horizontal LPH||1450||* 1700|
|Vertical LPH||1400||* 1700|
|5° Diagonal LPH||+ 1000||n/a|
(@ 12 mp output size)
|Horizontal LPH||1650||* 1900|
|Vertical LPH||1600||* 1900|
|5° Diagonal LPH||+ 1000||n/a|
|Sony DSC-F717||Horizontal LPH||1450||* 1800|
|Vertical LPH||1300||* 1800|
|5° Diagonal LPH||+ 1000||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 DiMAGE A1 loses out to the two other five megapixel digital cameras here for the same reason the DiMAGE 7Hi did, lower than expected resolution performance combined with strong moire at the limit. It's a pity that Minolta didn't spend more time on the DiMAGE A1's Bayer interpolation and image processing algorithms in order to deliver clean images with the higher resolution I am sure the lens is delivering to the sensor.
Also available for download
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