Nikon COOLPIX S550 Repair Manual page 101

Items
Image quality
"Out of focus"
Gradation/luminance
level
Noise
Judgment standard
・ The resolution must correspond to the following value in the
whole zoom area.
Center horizontal/vertical: 1000 TV lines
(Measure the TV resolution lines at center.)
(Check each posture and the difference of zoom reciprocation.)
[Put a chart at the distance of 2m, set it in the out of focus condition
and shoot it. (Use a white paper to set it in the out of focus
condition.)]
[Histogram's gray average value]
・ Black: 10 ± 5
Gray: 145 ± 10
White: 220 ± 15
[Histogram's standard deviation]
・ISO64
Noise (Max. value of standard deviates of each R, G, B, and Y):
3.5 or less
・ISO400
Noise (Max. value of standard deviates of each R, G, B, and Y):
6.0 or less
・ In AUTO mode and the image quality priority mode, set the scale
to 5100K viewer with a full range of angle of view, then set AF
lock and shoot an object by defocusing.
・ Open the recorded image data file through Photoshop and pick up
a measurement section with the each color (its central area 64 ×
64 pixels) with the rectangle selector tool.
・ Read the average of luminance of histogram.
・ Measurement section
Luminance level:
Upper left 1 step (black), upper left 6 steps (gray), Center (white),
lower left 6 steps (gray), lower left 11 steps (black)
Noise: Max. value of standard deviates of each R, G, B, and Y of
all the patches of the chart.
- R ･ S550 -
INC
VMA21024-R.3750.A
Remarks
EIAJ chart
Photoshop
Siemens chart
5100K viewer
ITE γ 0.45
Gray scale (standard)
Photoshop