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Sample Point Size
This setting determines the size of the area sampled when dis-
playing the color value for the pixel under the cursor in the
information window, or when the white-point, gray-point, and
black-point tools are used in the Curves palette. You can select
a sample sizes of 1 1, 3 3, and 5 5 pixels. When the sample
size is set to 3
3 or 5
sampled is used. Choosing a large sample size reduces preci-
sion, but also minimizes the effects of noise; choosing a small
sample size has the opposite effect.
Auto Contrast Calculations
A further option in the Color sheet allows you to specify how
auto contrast operations in the Curves and LCH Editor pal-
ettes calculate the input values for the white point and black
point. By default, the white point is set to a value that excludes
0.5% of the brightest pixels in the current crop, the black point
to a value that excludes 0.5% of the darkest pixels in the crop.
This produces an optimal dynamic range, with minimum loss of
detail in shadows and highlights. To preserve detail at the ex-
pense of dynamic range, lower the "excluded" value for auto
contrast (a value of zero will set the black and white point re-
spectively to the darkest and brightest pixel in the crop). To
increase the dynamic range at the expense of detail, raise the
"excluded" value.
Reference: Preferences
5 pixels, the average for the pixels
Scan Window Settings
The Preview Tab
Using the Preview tab, you can select the settings that will auto-
matically be applied to images when the Preview button is
clicked.
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