case of spots, may be dark,
white, or transparent.
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
they can be avoided in
the operation and
drying negatives, be
sure to use wetting
agent or stabilizer.
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.
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
to monitor the process.
light-sensitive materials. Film exposure and processing
exposed and processed may provide unusable results.
reducing waste and retakes.
comparison of daily production to this standard. Visual
comparison of the reference to the standard is very
Basic Photography Course