Which value on the DPDG tool should I be looking at for differential gain (DG)?
Typically the value quoted as differential gain is the "p-p/max" value given in the upper right corner of the top graph. This value is the absolute difference between the highest and lowest values (given to the left of this value) represented as a percentage of the maximum chrominance value. If you subtract the "min" value from the "max" value given to the left, you should roughly get the "p-p/max" value.
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