Move the cross-hairs again, but this time stay within one pixel. Notice that the X and Y values in the table still change, but that the values in the File Pixel and LUT (Look Up Table) Value columns do not change. The columns assign to each pixel a value from 0 to 255 (called a DN number). The File Pixel columns are the actual pixel values of your data. The LUT Value column assigns a number to each pixel based on a combination of red, green, and blue used to make the colors on your screen.