...
11. Click the colors you want to use for the correction curve (Figure 14-3). As of use only the white, shades of grey and the black.
Figure 14. Image Correction Window.
...
4. In the Compare tab check that the corrected color square and Xrite color checker RGB values are very close (Figure 16). Make sure that the white does not exceed the Xrite values (RGB = 242, 242, 236). There is also a visual display so you can see the difference in color for the color checker and the corrected. If you are unable to produce a reasonable correction curve, it is necessary to redo your white balance correction described in the Calibration section below.
Figure 15. Tiff Correction
Note: the TIFF correction is applied to both the TIFF and JPEG image but for the JPEG image you can also apply a Brightness, Contrast and Gamma (BCG) correction (See JPEG Correction section below). This is done at the photographer’s discretion. With better balanced LEDs on the new light system you may not have to use the BCG corrections (leave the values at their mid-points. Figure 17-1).
Figure 16. Use the Compare tab to view the RGB values for the Xrite color checker and the corrected.
...