I have a surface model raster layer. Is there any way to select only the light colored cells? Or just the cells with a certain color characteristic such as color value? This is a DSM of crop plots and soil. I am using QGIS.
To solve your problem, you can use an expression to create a new field in the grid layer and then select them for a range of colour. Open the Field Calculator, select Create a new field (I suggest Decimal number (real))) and copy this:
raster_value('RASTER_LAYER_TO_USE', 1, centroid($geometry))
With the new field in the vector layer, you can use the tool Select by expression and
use the expression
To create grid use the tool Create Grid from the Processing Toolbox panel, and in Grid extent select "Use layer extent" with your raster: in this way you will create a grid that overlaps your raster.