Interpreting White and Black Point Targets
On first glance, the White and Black Point Targets appear thoroughly confusing. The following information will help you easily understand their function and assist you in determining accurate white and black point parameters for your printer/media combinations.
Individual White Point Test Value Target (240)
Target Structure - Individual Test Value Target
Each white and black point target image is made up of 18 individual value targets. Each value target contains a specific test value (240 in the example to the left), base values, and relative comparison values. It is this unique combination of base and relative values that allows for a precise visual evaluation of the specific test value for white and black point output.
240 RGB Individual Test Value Target
Specific Test Values
Each individual test value target is set up around a specific test value. In the example to the left the specific test value is a white point of 240 RGB . This specific test value is visually compared to the base value (255 RGB) and the relative values (+3, +1. -1, and -3.) The image to the left shows the specific test value for white point evaluation (240 RGB in this example) shaded in blue. The checkerboard pattern allows for more precise comparison of the values.
On the next pages we will take a closer look at base values, relative values, and grayscale neutrality.
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