Querying Raster Data
"Identify" Tool 
can also be used to query raster data by clicking the position you want to query. Besides the attributes, the pixel value or RGB value of the raster data are displayed in the window as well. Different types of images have different types of data. Like vector layers, you can press "Shift" key to query multiple points at the same time.
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The Identify Windows of each type of images are listed below:
Type |
Description |
Identify Window |
RGB image |
The left panel indicates that the image is a RGB image. The right panel shows the RGB value of the point you query. |
|
Grayscale image |
The left panel shows the original pixel value of the point; the right panel shows the stretched value and pixel value |
|
Index Color |
The left panel indicates the color index of the position; the right panel displays the color index and the RGB color of the. point |
|
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