Classify is similar to Discrete, except it considers the distribution of values and groups the values into the number of breaks or colors you want to display. It then groups the values of pixels together accordingly. The Discrete color scheme is continuous, as is Stretch, but you decide how many colors it uses to display your data with no legend in the Contents pane. This is appropriate for qualitative data such as land cover. Unique Values is similar, except the colors are not continuous. For example, 8-bit data is stretched from 0 to 255. Stretch is the classic color scheme option it takes the range of all the values in your data and stretches it to fit within a data type range. RGB, Unique Values, Stretch, Colormap, Classify, and Discrete all accomplish similar adjustments but in different ways. There are subtle, yet distinct, differences between the options you have when symbolizing imagery. You can also select other layers from the Contents pane and, without closing the Symbology pane, apply the same symbology to them. In the Symbology pane, you can fine-tune the parameters specific to the symbology type you selected. Click the bottom half of the Symbology button for access to additional symbology options.Set the symbology parameters for your layer.To change the appearance of an image layer, complete the following steps: This also works with a dataset that has a vector (V) and unit vector (U) component. Vector Field allows you to display ocean and wind currents as arrows indicating magnitude and direction. Classify and Discrete can be used to group continuous data into a limited number of groups. This is referred to as applying a stretch to a dataset. You can also display the values along a color scheme to show the areas that are brighter than others. For example, multispectral imagery can be displayed using a three-band color composite-also known as an RGB composite-in which you use the bands available to you to highlight features of interest. Only symbology types that are valid for the data you've selected are presented.
Modify the appearance of an image layerÄepending on the type of imagery you're working with, you have a number of options for displaying and symbolizing it.