Figure 16.21 Setting the Black Point.
This tool can be used with any gamma curve, although it is most effective when
used with the Master gamma curve.
After the Black Point button is clicked, shown in Figure 16.22, position the
mouse cursor over the image in the preview window and select a pixel value to be used
as the darkest point in the image. This will be the Black Point, or reference point for
darkness. In addition, the pixel’s location and RGB component values will be displayed,
as described in the “Marker Button” section of this manual.
Figure 16.22 The Black Point button – Macintosh and Windows.
When you decide on the pixel you want to use as the image’s Black Point, clicking
the mouse forces the gamma curves to use this value as the minimum value in the pre-
view window. Any pixels darker than the black point will be set to the minimum value.
The result of this new curve is approximated in the preview window.
Setting the White Point
The White Point represents the lightest point in the image, thus serving the
reverse function of the Black Point. Like the Black Point, selection of a White Point
Black Point
Master Curve
(a) The original 1:1 Master Curve
(b) The resulting Master Curve
after setting the Black Point
Black Point Marker
Master Curve
Page 150
Software Reference for Scanners
The Gamma Curve Editor Dialog
Chapter 16
Summary of Contents for Scanners
Page 1: ...Software Reference for Scanners ...
Page 14: ...Page XIV Software Reference for Scanners Table of Contents ...
Page 36: ...Page 22 Software Reference for Scanners Software Installation IBM PC or Compatible Chapter 3 ...
Page 126: ...Page 112 Software Reference for Scanners Cropping and Sizing Images Chapter 11 ...
Page 132: ...Page 118 Software Reference for Scanners Film Type and Orientation Chapter 12 ...
Page 146: ...Page 132 Software Reference for Scanners Focusing with Coolscan Chapter 14 ...
Page 170: ...Page 156 Software Reference for Scanners The Gamma Curve Editor Dialog Chapter 16 ...
Page 194: ...Page 180 Software Reference for Scanners Troubleshooting Windows ...