In processor QC, the mid-density target is around which optical density?

• A. 0.8
• B. 1.0
• C. 1.5
• D. 2.0

Answer: (B)

The mid-density target in processor QC is around an optical density of 1.0. This sits in the central, linear portion of the film’s response, so small changes in processor performance (like temperature, aging chemistry, or replenishment) cause predictable, proportional changes in density. A density near 1.0 provides a clear, stable midtone gray that preserves detail in both shadows and highlights, making it easy to read with a densitometer and by eye. Densities around 1.5 or 2.0 are quite dark and can obscure detail, while densities near 0.8 are lighter and may be less reliable as a reference. Therefore, 1.0 is the best target for consistent QC results.