determined by the location of the developed silver grains.
The dyes are
formed in the areas adjacent to the reduced silver.
When the silver is
removed during processing, the dye remains as a cloud centered where the
grain was located. Because the dye images are partially transparent, rather
than opaque, and are formed by chemical diffusion, their density increases
gradually from the edge to the center. On the other hand, the density of a
silver image changes abruptly at the edge of the grain.
film appears less grainy than black and white, but the image has lower edge
sharpness and image definition.
The magenta dye image (green-sensitive
layer) has the greatest appearance of graininess because the peak
sensitivity of the human eye is in the region of the spectrum.
(1) Atypical emulsion of
recorded in the same manner
in almost all color films, negative and
reversal, a cross-section of a
better understanding. Refer to
(a) Starting at the top is the blue-sensitive layer of the
This is where the blue record is made.
emulsion is sensitive to blue light only.
(b) Below the blue-sensitive emulsion is a layer
colloidal silver suspended in clear gelatin that absorbs the
light that penetrates the blue-sensitive emulsion; this layer is
action to a yellow filter. The colloidal silver is bleached and
during the processing.