DICOM PS3.14 2019d - Grayscale Standard Display Function

7.2 Transmissive Hardcopy Printers

For transmissive hardcopy printing, the relationship between luminance, L, and the printed optical density, D, is:

Equation 7-3. 


where:

If film is to be printed with a density ranging from Dmin to Dmax, the final luminance will range between and and the j values will correspondingly range from jmin = j(Lmin) to jmax = j(Lmax).

If this span of j values is represented by an N-bit P-Value, ranging from 0 for jmin to 2N-1 for jmax, the j values will correspond to P-Values as follows:

Equation 7-4. 


and the corresponding L values will be L(j(p)).

Finally, converting the L(j(p)) values to densities results in:

Equation 7-5. 


Note

Typical values for the parameters used in transmissive hardcopy printing are L0 = 2000 cd/m2, La = 10 cd/m2.

DICOM PS3.14 2019d - Grayscale Standard Display Function