How do you check the attribute information of the tif image in QGIS?

Question

Where can I check the brightness value (DN) of the image stored as 'tif format' in QGIS? What is the way to add it to the attribute table?

Current progress: Coordinates are assigned to each pixel of the raster image.

My plan: The DN value of each pixel is added to the attribute table, and the DN value is classified and analyzed.

What I Need:

To check DN value in image, add DN value to attribute table.

Answer 1

You could use these two steps:

• Use the tool Raster pixels to points
  Processing Toolbox > Vector creation > Raster pixels to points

• Use Add X/Y fields to layer on the points layer
  Processing Toolbox > Vector table > Add X/Y fields to layer