Basic Photography Course

Figure 12-5.On-easel color analyzer.

302.261

negative to be printed is then read on the densitometer
and these densities are subtracted from the total density
values of the standard negative (negative reference
patch and enlarger filter pack). This method of
evaluation does not indicate directly the required
exposure for the production print, but the production
print exposure can be estimated closely by using the

standard negative exposure and compensating for any

changes to the filter pack. An example on how this
off-easel evaluation system operates is as follows:

Gray patch of standard
negative

= 47C 51M 50Y

Established filter pack for

standard negative

= 0C 47M 34Y

Sum:

47C 98M 84Y

Subtract gray patch of
production negative

44C 63M 49Y

Difference:

03R 35G 35Y

To illuminate neutral density

03 03 03

Production negative filter pack

0C 32M 33Y

A reflection densitometer also can be very useful in

color print evaluation. A reflection densitometer can be

used to match an earlier printed print with the color print
you are currently printing. To use a reflection
densitometer as an aid in color printing, you must
compare or read a reference area on your test print. This
is particularly useful when you are making a color print
with neutral areas. As you know, black, gray, and white
have approximately equal portions of red, green, and
blue. By taking a reflection densitometer reading
directly from one of these neutral areas (such as a gray
card, the side of a ship, or part of a gray aircraft), you
can determine what color and the amount of that color
in excess. To change your filter pack for print

corrections, you must take one half of the density value

as read from the densitometer and either add or subtract
that value from your filter pack; for example, you take
a reflection densitometer reading from a gray patch on
your color test print. Your density readings are 50R,
50G, and 70B. The densitometer indicates that your test
print is high by 20B (too much yellow dye). To adjust

the filter pack, you should add CC10Y to your filter pack

for subtractive printing or add CC10B on an additive

printer.

Another off-easel color evaluation system is a color

video analyzer. This system scans the color negative and
is viewed directly on a color monitor. The image on the

monitor can be manipulated until the proper color

balance, density, and image size are achieved. The

12-12

contents

Basic Photography Course

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DOFMaster for Windows On-line Depth of Field Calculator DOFMaster for Mobile Devices On-line Depth of Field Table Hyperfocal Distance Chart Articles FAQ Recommended Books Support Contact Links Home As an Amazon Associate I earn from qualifying purchases.	contents <- previous page next page -> Figure 12-5.On-easel color analyzer. 302.261 negative to be printed is then read on the densitometer and these densities are subtracted from the total density values of the standard negative (negative reference patch and enlarger filter pack). This method of evaluation does not indicate directly the required exposure for the production print, but the production print exposure can be estimated closely by using the standard negative exposure and compensating for any changes to the filter pack. An example on how this off-easel evaluation system operates is as follows: Gray patch of standard negative = 47C 51M 50Y Established filter pack for standard negative = 0C 47M 34Y Sum: 47C 98M 84Y Subtract gray patch of production negative 44C 63M 49Y Difference: 03R 35G 35Y To illuminate neutral density 03 03 03 Production negative filter pack 0C 32M 33Y A reflection densitometer also can be very useful in color print evaluation. A reflection densitometer can be used to match an earlier printed print with the color print you are currently printing. To use a reflection densitometer as an aid in color printing, you must compare or read a reference area on your test print. This is particularly useful when you are making a color print with neutral areas. As you know, black, gray, and white have approximately equal portions of red, green, and blue. By taking a reflection densitometer reading directly from one of these neutral areas (such as a gray card, the side of a ship, or part of a gray aircraft), you can determine what color and the amount of that color in excess. To change your filter pack for print corrections, you must take one half of the density value as read from the densitometer and either add or subtract that value from your filter pack; for example, you take a reflection densitometer reading from a gray patch on your color test print. Your density readings are 50R, 50G, and 70B. The densitometer indicates that your test print is high by 20B (too much yellow dye). To adjust the filter pack, you should add CC10Y to your filter pack for subtractive printing or add CC10B on an additive printer. Another off-easel color evaluation system is a color video analyzer. This system scans the color negative and is viewed directly on a color monitor. The image on the monitor can be manipulated until the proper color balance, density, and image size are achieved. The 12-12 contents Basic Photography Course <- previous page next page ->	As an Amazon Associate I earn from qualifying purchases.
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