Gray balancing QPcard 101

Instruction for gray balancing with QPcard 101 using the Eyedropper tool in Adobe Photoshop.

1) Place QPcard 101 in the subject. Make sure it is lit by the same light as the main part of the subject.

2) Take a picture with white balance on camera on an appropiate setting (NOT Auto White Balance!).

3) Take the rest of the pictures without QPcard 101.

4) Open the first picture in Adobe Photoshop or other suitable image or camera software.

5) Choose the eyedropper tool and set Sample Size to 5 by 5 Average.


6) Check the gray balance in the gray patch of QPcard 101. In this example it is too blue and a little bit too green.

7) Choose Levels and click on the gray eyedropper. Make shure it isset to neutral by double clicking and checking RGB numbers. Default setting is 128, 128, 128.


8) Now click on the gray patch of QPcard 101. The RGB values will become equal, meaning neutral gray. If the gray patch still seems to have a color cast you have to calibrate your monitor.

9) Save the gray balancing profile by clicking "Save...".

10) Open the other pictures taken in the same light and same white balance setting on camera.

11) Choose Levels and click "Load..." to apply the saved gray balancing profile.