Display tab

On the Display tab, you can control the opacity of the layer and, when included, select whether NoData values are visible and, if so, the color to use.

Opacity
Select this check box to select an opacity for the layer.

Percent
Drag the slider to the opacity you want or, alternatively, type a percentage value in the box to the right.

Notice that as you drag the slider a tooltip appears, indicating the precise value to set.

View NoData
Available when a NoData value is unavailable at either the file or channel level, select this check box to select a color for the NoData value.

To select a color, click the arrow beside the color displayed currently, and then in the palette, click the color you want. To select from additional colors, click More.