следующий фpагмент (2)>I'm interested in creating multiple frame of film grain that would be
>convolved with existing images. It would consist of lightly colored
>grains and bits of dirt. Anyone have suggestions for an approach?
Just my 2c worth...
I presume you want to make the images look "old". There are two sets
of things you need to consider - the properties inherent in the
original film and those induced by the passage of time.
Inherent film properties are:
- Grain, which could be approximated using a low-contrast noise
- Processing flaws, such as bubbles. Place the occasional light or
dark circle on the frame.
- Exposure problems, such as edge fogging or inconsistent exposure.
These usually change fairly slowly, and are relatively easily modelled
using brightness/contrast adjustments either near the edges or over
the whole frame.
- Buildup of dust, hair, etc. Sprinkle a few dark specks and
curvilinear features over each frame.
- Scratches. These are usually due to contact with the projector
mechanism and are thus mostly in the direction of film travel (usually
vertical). They are not usually continuous, but typically persist over
several tens of frames.
- Severe heat damage, such as burn-through. This usually affects the
darker areas first since they absorb more heat.
- Loss of contrast due to pigment fading. Simply reduce the contrast
and increase the brightness. Similar to inconsistent exposure
design/collection/some content by Frog,
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