The Preview pane provides visual feedback on the selected image by applying a highlight to all pixels included in the range. A set of controls allow you to explore the preview (Zoom In, Zoom Out, Pan, Fit, Update Preview, Update View and Restore View).

Displays the luminance histogram of the currently selected image when Luminance is selected in the Edit Mode group. The display of the histogram is a representation of the number of pixels having each of the 256 possible values, from 0 to 255.

The Sliders are used to comprise in that range on the required values. All the pixels (values) comprised in that range are highlighted on the image.

The Up/Down controls at the left of the graph are used to adjust the Vertical Scale of the histogram. The Sliders and text boxes are used to position the start and end points of the range. The Center Slider is used to move the ranger across the histogram.

Displays the channel histogram of the currently selected image when RGB Color is selected in the Edit Mode group. The display of the histogram is a representation of the number of pixels having each of the 256 possible values, from 0 to 255.

The Sliders are used to comprise in that range on the required values. All the pixels (values) comprised in that range are highlighted on the image.

The Up/Down controls at the left of the graph are used to adjust the Vertical Scale of the histogram. The Sliders and text boxes are used to position the start and end points of the range. The Center Slider is used to move the ranger across the histogram.

• RGB — When selected, displays in the graph area the histogram for the currently selected imageIn RGB mode, the Shadows and Hilites values are applied to each channel. In RGB mode, if Shadows is set to 50 and Highlights is set to 200, the Red, Green and Blue channels will each be set to 50 and 200. Displays the addition of the R, G and B histogram.

• Red — When selected, displays in the graph area the Red channel histogram of the currently selected image.In Red mode, the Shadows and Highlights values are applied to the RED channel only. In RED mode, if Shadows is set to 50 and Highlights is set to 200, ONLY the Red channel is set to 50 and 200.In Red mode, the histogram will be displayed in shade of red. Every portion of the histogram to the left of the shadows will be displayed black. Starting at the shadow position, the histogram will display shade of red up to the highlight position where it will be pure red. The part of the histogram at the right of the highlight will be pure red. The curve that attaches all the maximums values of the histogram will be displayed black. The variation in the shade of red will reflect the Gamma value.

• Green — When selected, displays in the graph area the Green channel histogram of the currently selected image. In Green mode, the Shadows and Highlights values are applied to the Green channel only. In Green mode, if Shadows is set to 50 and Highlights is set to 200, ONLY the Green channel is set to 50 and 200.In Green mode, the histogram will be displayed in shade of green. Every portion of the histogram to the left of the shadows will be displayed black. Starting at the shadow position, the histogram will display shade of green up to the highlight position where it will be pure green. The part of the histogram at the right of the highlight will be pure green. The curve that attaches all the maximums values of the histogram will be displayed black. The variation in the shade of green will reflect the Gamma value.

• Blue — When selected, displays in the graph area the Blue channel histogram of the currently selected image. In Blue mode, the Shadows and Highlights values are applied to the Blue channel only. In Blue mode, if Shadows is set to 50 and Highlights is set to 200, ONLY the Blue channel is set to 50 and 200. In Blue mode, the histogram will be displayed in shade of blue. Every portion of the histogram to the left of the shadows will be displayed black. Starting at the shadow position, the histogram will display shade of blue up to the highlight position where it will be pure blue. The part of the histogram at the right of the highlight will be pure blue. The curve that attaches all the maximums values of the histogram will be displayed black. The variation in the shade of blue will reflect the Gamma value.

Use to determine the Edit Mode to be used in the histogram.

When selected, the histogram of the image, if not already done so, is converted to LUV where the L is used to display the histogram and enhance the image.

When selected, the histogram of the image is displayed in RGB. A Combo box displays the following choices: RGB, Red, Green and Blue.

When ON, the Shadows and Highlights values of each channel is displayed in the histogram graph using a pair of vertical lines in the same color of the channel. The lines are positioned on the graph at the position representing the values of the channel. The Range option is automatically turned ON if the combo box selection returns to Lightness or RGB and where channels have been modified. When two or more channels have the same value, the vertical line is displayed in black.

When OFF, the vertical lines are not displayed in the histogram graph area.

When ON, the gamma values of each channel is displayed in the histogram graph using a diagonal line in the same color of the channel. The Gamma Curves option is automatically turned ON if the combo box selection returns to Lightness or RGB and where the gamma has been modified. When two or more gamma channels have the same value, the diagonal line is displayed in black.

When OFF, the diagonal lines are not displayed in the histogram graph area.

When ON, displays the histogram in the Composite mode

When OFF, displays three histogram outlines using each channel color.

The Auto button produces an automatic Contrast Stretch. To automate the process, the Shadows and Highlights clipping values are computed by excluding a specified percentage of pixels for both extremities. The percentages are predefined by default values and can be tweaked by the user. The values are taken from User Preferences. The Settings button can be used by the user to change these values. When the user clicks on the Auto button, the shadow and highlight values are computed and the sliders are positioned accordingly. In addition, the gamma is reset to 1.

The Settings button opens the Descartes Settings dialog, automatically selecting the Contrast Stretch Tab. The tab presents the new Auto Clipping Limits group with two user defined settings, Shadows and Highlights. You can change the values, click OK and return to the Contrast Stretch Dialog. You must click Auto again to apply the new values. If you previously clicked Auto, the Stretching is done on the new histogram. User must use the Reset button to apply the new values to the original histogram.

Click to apply the contrast stretch to the image without exiting the Density Slicing dialog.

The Reset button resets to default values all dialog settings.

Click OK to apply the contrast stretch to the image and exit the Density Slicing dialog.

The Cancel button closes the dialog and resets the values to their default. No changes are applied to the image.