The density difference in densitometry is typically measured between which optical density values?

The density difference in densitometry is typically measured between which optical density values?

• A. 0.15 and 1.75
• B. 0.25 and 2.50
• C. 0.50 and 1.25
• D. 0.75 and 2.00

Answer: (B)

Densitometry relies on reading optical density in the portion of the scale where film response and the densitometer are most accurate. The standard, usable range is about 0.25 to 2.50 OD. Measuring the density difference across this window gives the widest, most reliable dynamic range for assessing film exposure and processing, while avoiding the base-plus-fog region at the low end and saturation at the high end. Therefore, the typical density difference is determined between 0.25 and 2.50 OD.

Densitometry relies on reading optical density in the portion of the scale where film response and the densitometer are most accurate. The standard, usable range is about 0.25 to 2.50 OD. Measuring the density difference across this window gives the widest, most reliable dynamic range for assessing film exposure and processing, while avoiding the base-plus-fog region at the low end and saturation at the high end. Therefore, the typical density difference is determined between 0.25 and 2.50 OD.