Basic Photography Course

Table 3-7.Safelight Filters

Filter Designation

Color

Greenish Yellow

Use With

Black-and-white contact and duplicating materials
and projection films

No. 1

No. 1A

No. 2

*No. 3

Light Amber

Red

Light Red

Dark Red

Dark Green

Printing papers

Blue sensitive films

Orthochromatic copy films

Orthochromatic films

Panchromatic films

NOTE

*Use caution when processing panchromatic film under a No. 3 safelight. When a No. 3 safelight is used, the

film should not be exposed to it until at least half of the developing time has passed. Then the film should be
examined quickly at a distance of about 36 inches from the safelight. Much experience is needed to judge proper
negative development by the process of inspection, and it is rarely performed.

Yellow filters are used to print black-and-white
negatives that are high in contrast. Variable contrast
printing filters are discussed in chapter 10 of this
TRAMAN.

FILTERS FOR COLOR PRINTING

Filters used to print color are as follows: color

compensating (CC), color printing (CP), ultraviolet
absorbing, and dichroic. Each one of these filters is
discussed below.

Color Compensating Filters

The color compensating filters used for printing

color materials are the same CC filters used with color
film. These filters are used to modify the color quality
of the exposing light needed to print the color negatives
or transparencies. CC filters are used between the lens

and the paper in the color printing process. These CC
filters are referred to as a filter pack

CC filters control the color of light that strikes the

emulsion. They control the amount of light each
emulsion layer receives during exposure. That results in
the amount of color dyes formed in each emulsion layer.
The overlapped colored dyes (cyan, magenta, and

yellow in proper proportions) represent the colors of the

original scene.

Color Printing Filters

Color printing (CP) filters are used in color printing,

the same as CC filters with one exception. CP filters are
placed in the enlarger between the light source and the
negative or transparency being printed. That is done
because CP filters are made of acetate and affect image
definition.

CP filters are available in red, cyan, magenta, and

yellow with densities of 0.05, 0.10, 0.20, and 0.40. The
color of a filter and its peak density are identified the
same as CC filters.

Ultraviolet Absorbing Filters

Ultraviolet absorbing filters for color printing

prevent the fogging of the color material by ultraviolet
radiation emitted by the exposing light source. This filter
is not considered part of a printing filter pack, but it is

always present in color printing systems. An ultraviolet

absorbing filter for color printing is identified as 2B.

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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 -> Table 3-7.Safelight Filters Filter Designation Color OA Greenish Yellow Use With Black-and-white contact and duplicating materials and projection films OC No. 1 No. 1A No. 2 No. 3 Light Amber Red Light Red Dark Red Dark Green Printing papers Blue sensitive films Orthochromatic copy films Orthochromatic films Panchromatic films NOTE* Use caution when processing panchromatic film under a No. 3 safelight. When a No. 3 safelight is used, the film should not be exposed to it until at least half of the developing time has passed. Then the film should be examined quickly at a distance of about 36 inches from the safelight. Much experience is needed to judge proper negative development by the process of inspection, and it is rarely performed. Yellow filters are used to print black-and-white negatives that are high in contrast. Variable contrast printing filters are discussed in chapter 10 of this TRAMAN. FILTERS FOR COLOR PRINTING* Filters used to print color are as follows: color compensating (CC), color printing (CP), ultraviolet absorbing, and dichroic. Each one of these filters is discussed below. Color Compensating Filters The color compensating filters used for printing color materials are the same CC filters used with color film. These filters are used to modify the color quality of the exposing light needed to print the color negatives or transparencies. CC filters are used between the lens and the paper in the color printing process. These CC filters are referred to as a filter pack CC filters control the color of light that strikes the emulsion. They control the amount of light each emulsion layer receives during exposure. That results in the amount of color dyes formed in each emulsion layer. The overlapped colored dyes (cyan, magenta, and yellow in proper proportions) represent the colors of the original scene. Color Printing Filters Color printing (CP) filters are used in color printing, the same as CC filters with one exception. CP filters are placed in the enlarger between the light source and the negative or transparency being printed. That is done because CP filters are made of acetate and affect image definition. CP filters are available in red, cyan, magenta, and yellow with densities of 0.05, 0.10, 0.20, and 0.40. The color of a filter and its peak density are identified the same as CC filters. Ultraviolet Absorbing Filters Ultraviolet absorbing filters for color printing prevent the fogging of the color material by ultraviolet radiation emitted by the exposing light source. This filter is not considered part of a printing filter pack, but it is always present in color printing systems. An ultraviolet absorbing filter for color printing is identified as 2B. 3-11 contents Basic Photography Course <- previous page next page ->	As an Amazon Associate I earn from qualifying purchases.
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