Are you talking about the Dmax of negative or positive images?

Are you accounting for the contrast and latitude if these are negatives?

If they are positives, are they direct positives achieved by a reversal process, or are they made by a neg-pos printing process?

These questions are critical in the answer to the OP.

And then, are these figures from a densitometer or from a scanned image? If so, then nothing can be said!