Sequence viewing > Index - Alternative Photo Emulsions - Resource - ©
Lloyd Godman
Alternative
Photographic Processes - (Hand
made photographic -emulsions and processes)
Exposure tests
While you can carry out
a series of exposure tests using the contact negative for the image,
it can be more informative using a tonal step wedge where the tones
are precise and known.
Creating
a step wedge in Photoshop
You
can either conduct these tests with the step wedge or include
it along side the image. Here we see the negative lower, a test
on .. centre and a teston Hahhamule paper |
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When it comes to establishing
an exposure you will find there ae a number of variables that come into
play.
For instance:
The
light source
Length of time for the
exposure
Paper
type
Cyanotype test on Arches
Water colour paper at top - Hahnaule paper at bottom
Number
of emulsion coatings
Want to learn more? - do a workshop or one on one with Lloyd Godman
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