Raster Properties Dialog:Symbology
Symbology Tab
QGIS can render raster layers in two different ways :<A NAME="63"></A> <P>
- Single band - one band of the image will be rendered as gray or in pseudocolors.
- Three band color - three bands from the image will be rendered, each band representing the red, green or blue component that will be used to create a color image.
<P> Within both render types you can invert the color output using the Invert color map checkbox.
<P> Single Band Rendering
<P> This selection offers you two possibilites to choose. At first you can select which band you like to use for rendering (if the dataset has more than one band).
<P> The second option offers a selection of available colortables for rendering.
<P> The following settings are available through the dropdownbox color mapGrayscale, where grayscale is the default setting. Also available are
- Pseudocolor
- Freak Out
- Colormap
<P> When selecting the entry color mapColormap, the tab Colormap becomes available. See more on that at chapter <A HREF="node7.html#label_colormaptab">6.3.3</A>.
<P> QGIS can restrict the data displayed to only show cells whose values are within a given number of standard deviations of the mean for the layer.<A NAME="76"></A> This is useful when you have one or two cells with abnormally high values in a raster grid that are having a negative impact on the rendering of the raster. This option is only available for pseudocolor images.
<P> Three band color
<P> This selection offers you a wide range of options to modify the appereance of your rasterlayer. For example you could switch color-bands from the standard RGB-order to something else.
<P>
Also scaling of colors are available.