Olympus DP70 User Manual page 23

Camera settings
Sharpness Use the sharpen filter to increase or decrease the sharpness of the image by edge
Contrast Move the
Brightness Use the
1 γ ⁄
I = I
0
with I = intensity value of the destination image, I
image.
The values for Gamma vary between 0.2 and 5. Values smaller than 1 make the
image altogether darker. At the same time, the contrast in bright areas of the image
will be increased. Values greater than 1 make the image altogether brighter. At the
same time, the contrast in dark areas of the image will be increased.
enhancement. You change the strength of the sharpen filter by moving its slide con-
trol.
Values ranging from -30 to 30 are possible, whereas the default value is 0. The image
gains a smoother appearance when you use negative values and a sharper one
when you use positive values. Raising sharpness will accentuate edges, but also
increases image noise. Entering a value of 0 will result in the sharpen filter having no
effect at all.
Contrast slide to change the contrast values of the image. Values smaller
than 1 lower the image contrast. Values greater than 1 enhance the image contrast.
When changing the image contrast the brightest part of the image always remains
the same.
After changing the image contrast it may be that dark or bright image areas are not
displayed optimally anymore. In this case use the
whole image brighter or darker.
Brightness slider, if the whole image is too bright or too dark. Values smaller
than 0 lower the image brightness. Values greater than 0 increase the image bright-
ness.
Shading correction
In the Shading Correction
the shading correction corrects the effect of an inhomogeneous illumination (Illumi-
nation correction). Additionally, the shading correction corrects the different sensitiv-
ity of individual pixels on the CCD chip (Noise correction).
Select the Dark option to activate the Noise Correction.
Select the Flatfield option to activate both the Illumination Correction and the Noise
Correction.
Select the Off option to disable the shading correction.
Click the Edit... button to check whether correction images have already been
acquired or not. When correction images are available, you will find them listed here.
In the Image Type column, the correction images for the noise correction are identi-
fied by the entry Dark, the correction images for the illumination correction, with the
entry Flatfield.
= the intensity value of the source
0
group you can correct two different shadings. First of all,
Brightness slider to make the