Transfer Function Properties

The Transfer Function Properties dialog is used to interactively adjust the transfer function of an image (also see Choosing Transfer Function Settings).

• Open the Transfer Function Properties dialog using the View > Transfer Function command or click on the Image Toolbar or menu.

• You can also open this dialog using the Ctrl+T keyboard accelerator when an Image Window is the top-most window.

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  If you change settings for an Image Set, the changes may be applied to either the active image or to the entire set, depending on the state of the button. For RGB images, the adjustments of the transfer function are handled by the Palette Properties dialog.

The current transfer function is listed in the Profile Control below the histogram graph. Once loaded, a transfer function can be modified by changing its properties using the controls in the bottom half of the dialog. If you simply want to load an existing transfer function and do not need to change it, you can click [Hide >>] to shrink the dialog and save desktop space, as shown below:

• The Sample, Range, and Stretch settings control the way the transfer function is computed for the image. These properties are described in detail in Transfer Functions. See Choosing Transfer Function Settings for advice on setting the controls.

• Other Transfer Function Controls

• The slider sets the gamma value when the Stretch method is set to Gamma. This controls the contrast at preferentially the lower brightness levels (gamma < 1) or higher brightness levels (gamma > 1).

• The [Save] button saves the current preferences to the named profile and sets this profile as the default for new Image Windows. This button does not load any default settings into the dialog or to the image window.

• The button reverts to the previous parameter settings. Use this button if your changes are making the image worse and you want to start with the previously saved preferences for the current profile.

• The Auto check box controls whether changes in this dialog are immediately applied to the image. If you check this box, you will see the result of the change when you release the control (e.g., drop box, slider, etc.). If this box is not checked, then changes will be applied to the image only after you click the [Apply] button. Using the Auto setting may cause some delays in re-displaying large images or entire image sets or otherwise on a slow computer.

• The [Apply] button applies the property changes when Auto is not checked.

Related Topics

Transfer Functions, Choosing Transfer Function Settings, Displaying Images, Image Windows, Palette Properties dialog