Table 51: Zone descriptions, textural properties, film densities

July 12th, 2008 | Người đăng: chau

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Table 51: Zone Descriptions, Textural Properties, Film Densities

Zone	Zone 0	Zone I	Zone II	Zone III	Zone IV	Zone V	Zone VI	Zone VII	Zone VIII	Zone IX	Zone X
Descr. of print value	Dmax. pure black.	1st perceptable value lighter than black.	very very dark gray	fully textured dark Gray	dark middle gray	middle gray 18% reflectance	light middle gray	fully textured light Gray	very very light gray	1st perceptable gray darker than white	Dmin. paperbase white
Texture	none	none	suggestion of texture	full texture	full texture	full texture	full texture	full texture	suggestion of texture	none	none
Film Density	.02	.11	.21	.34	.48	.62	.76	.97	1.18	1.33	1.44
Notes:	The figures above came from a series of tests performed by Martha Milsaps during the summer of 1991 (I think :-). Martha tested 35mm Kodak T-Max 100 film for printing on a condenser enlarger; I oversaw the test procedures and results. These figures may differ from your own; they represent appropriate film densities for the particular equipment Martha was using in the darkroom. If you are using a different film or are using a different enlarger, then your figures should be different from these. So do not worry if your test results vary somewhat from these. Even so, these densities are an an excellent representative set that you can use as known good values to compare to your own film test results.

Other observations:

Dmax: represents the blackest, densest tone that a given paper can reproduce. This varies from one paper to another and even (but less-so) from one batch of a paper to another or from one grade of a paper to another.
Dmin: represents paperbase white, or the lightest tone a paper can reproduce. This also varies from paper to paper.
Range of Full Texture: note that the zones 3, 4, 5, 6, and 7 have full texture. This is a useful piece of information.
Range of Partial Texture: note that the zones 2, 3, 4, 5, 6, 7, and 8 have at least partial texture. This is also useful information.