After raw images are captured, start the AWB tuning from the Plug-ins drop-down menu. Import the raw images one by one in the Reference files tab (see the AWB plug-in guide for details) and enter the parameter values for each image:

• Color Temperature: this must be what is used when capturing the raw image. For example, the value is 6500 for the D65 lighting condition.
• Exposure, Gain, and Aperture: these values are not used for AWB; therefore, these values can be ignored.
• Black Level: this must be the pedestal value that was measured in the Black Level Subtraction plug-in. In this example, IMX219 has a measured black level of 63 in 10-bit mode.

Pay special attention when selecting the corners of the color checker chart:

• Starting with the upper left corner, click on the four corners of the color checker chart in clockwise order.
• After the four corners are selected, the tool automatically identifies the 24 patches and displays the selection of each patch as shown below.

Figure 7-15 through Figure 7-16 show an example of importing one raw image for AWB tuning.

After importing all raw images, follow the AWB plug-in guide to do the tuning. If tuning is successful, reference Cb-Cr plot scheme is displayed. Below is the result plot using the raw images shown above.

After tuning is done, generate new output XML files and new binary files as done in tuning Black Level Subtraction. Then use the newly-generated DCC binary files to stream and capture. Figure 7-18 and Figure 7-19 show images captured before AWB tuning and after AWB tuning (all gray patches appear neutral in the image after AWB tuning).