Basic Photography Course

Table 10-1.-Negative Defects: Their Appearance, Cause, and Remedy-Continued

Defect

Appearance

Cause

Remedy

Streaks.

Streaks and patches. In the
case of spots, may be dark,
white, or transparent.

May be due to uneven
development, caused by
insufficient agitation. May also be
due to developer splashed on the
film before development, a dirty
tank, fixer tray or tank used for
developing, or a light fog. If the
edges of the film are clear, trouble
is in the camera; if the edges are
fogged, it is due to a light leak in
the film magazine or processing
tank. Certain types of resinous
woods and varnishes cause dark
patches. White or transparent
patches may be due to
obstructions in the camera that
prevented light from acting on the
film; an oil or grease that
prevented action of the developer;
hypo on film before development.
Drying marks in the form of
teardrops or white patches are
caused by splashes of water on a
dry negative or by leaving spots of
water on the film before drying,
especially if the film is dried in
warm air.

Trace the cause of the

streaks. In many cases,
they can be avoided in
the operation and
maintenance of
equipment. When
drying negatives, be
sure to use wetting
agent or stabilizer.

PROCESS MONITORING

To consistently produce the highest quality

photographic products possible and to prevent chemical
processing defects, you must monitor the photographic
processes. From a hand-processing system to a
sophisticated, computerized processing system, process
monitoring is necessary to achieve high quality on a
consistent basis. When it is performed routinely, process
monitoring can detect minor problems before a major
casualty to your imagery results as well as aid in the
proper replenishment of your processing system.

The area of quality control and process monitoring

can be very complex. Some Navy Photographer's Mates
earn an NEC and specialize in the field of quality control
for photographic processes. It is not the intention of this
training manual to provide you with the information

necessary to become a specialist in photographic quality

control; however, you must learn the appropriate steps
to monitor the process.

The production of high-quality photographic

products requires control over all the factors that affect
light-sensitive materials. Film exposure and processing

are the most important of these factors. Negatives or

positives that have not been uniformly and correctly
exposed and processed may provide unusable results.

By monitoring the process and providing high-quality

products, you can save time and operating costs by
reducing waste and retakes.

Any monitoring system for the photographic

process requires a reference or standard, and
comparison of daily production to this standard. Visual
comparison of the reference to the standard is very

subjective and limited in accuracy because of personal

opinion. A more accurate method is to measure your

production against the standard. Two means of making

10-38

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 -> Table 10-1.-Negative Defects: Their Appearance, Cause, and Remedy-Continued Defect Appearance Cause Remedy Streaks. Streaks and patches. In the case of spots, may be dark, white, or transparent. May be due to uneven development, caused by insufficient agitation. May also be due to developer splashed on the film before development, a dirty tank, fixer tray or tank used for developing, or a light fog. If the edges of the film are clear, trouble is in the camera; if the edges are fogged, it is due to a light leak in the film magazine or processing tank. Certain types of resinous woods and varnishes cause dark patches. White or transparent patches may be due to obstructions in the camera that prevented light from acting on the film; an oil or grease that prevented action of the developer; hypo on film before development. Drying marks in the form of teardrops or white patches are caused by splashes of water on a dry negative or by leaving spots of water on the film before drying, especially if the film is dried in warm air. Trace the cause of the streaks. In many cases, they can be avoided in the operation and maintenance of equipment. When drying negatives, be sure to use wetting agent or stabilizer. PROCESS MONITORING To consistently produce the highest quality photographic products possible and to prevent chemical processing defects, you must monitor the photographic processes. From a hand-processing system to a sophisticated, computerized processing system, process monitoring is necessary to achieve high quality on a consistent basis. When it is performed routinely, process monitoring can detect minor problems before a major casualty to your imagery results as well as aid in the proper replenishment of your processing system. The area of quality control and process monitoring can be very complex. Some Navy Photographer's Mates earn an NEC and specialize in the field of quality control for photographic processes. It is not the intention of this training manual to provide you with the information necessary to become a specialist in photographic quality control; however, you must learn the appropriate steps to monitor the process. The production of high-quality photographic products requires control over all the factors that affect light-sensitive materials. Film exposure and processing are the most important of these factors. Negatives or positives that have not been uniformly and correctly exposed and processed may provide unusable results. By monitoring the process and providing high-quality products, you can save time and operating costs by reducing waste and retakes. Any monitoring system for the photographic process requires a reference or standard, and comparison of daily production to this standard. Visual comparison of the reference to the standard is very subjective and limited in accuracy because of personal opinion. A more accurate method is to measure your production against the standard. Two means of making 10-38 contents Basic Photography Course <- previous page next page ->	As an Amazon Associate I earn from qualifying purchases.
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