« Return to Thread: [Fwd: Photography Half-Life (Decay Rate) Changes]
RE: [Fwd: Photography Half-Life (Decay Rate) Changes]
by lookaround360
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Steve,
My scientific studies went like this:
Test No. 1.
Keep Ektachrome slides in damp basements, blazing hot/freezing cold
attics and garages for forty years. Keep Kodachrome slides in same
conditions for even longer.
Kodachrome slides look just fine. One of me when I was only two years
old - and I'm OLD geezer now - will print correctly with no blemishes.
Ektachrome slides are laced with fungus like a petri dish. Maybe good
sour-dough bread starter but not much else.
Test No. 2.
Many rolls of dad's 35mm, Agfa film from WWII coiled like a spring for
thirty-five years and then flattened out and stored between pages in
heavy art books. Still look OK except they curve width-wise.
Test No. 3
Wrap C.1900, 4 x 5 glass plate negatives inside newspaper for seventy
years. Pictures are a bit faded but printable. The newspapers are yellow
and a bit flaky but fully readable.
AZ
Build a 120/35mm Lookaround!
The Lookaround E-Book 5ed.
NOW SHIPPING
http://www.panoramacamera.us
> -------- Original Message --------
> Subject: [SPAM] [Fwd: Photography Half-Life (Decay Rate) Changes]
> From: steve harris <dshlaw@...>
> Date: Thu, June 25, 2009 12:11 pm
> To: List for Photo/Imaging Educators - Professionals - Students
> <photoforum@...>
> According to wikipedia at:
> http://en.wikipedia.org/wiki/Half-life
> The concept of half-life is often used to describe the decay of discrete
> entities, such as radioactive atoms. It is the time when the /expected
> value <http://en.wikipedia.org/wiki/Expected_value>/ of the number of
> entities that have decayed is equal to half the original number.
> The question is -- Has anyone on this list, or otherwise, done any
> studies on the half life of photographic images recorded on various media?
> The "decay" or loss of any given image could be from a number of causes
> -- decay of the recording material, destruction due to damage from fire,
> water, etc., discard by owner, change in technologies, etc.
> Do the members on this list think that the half-live of photo images has
> significantly shortened, because of the shift to digital? What about
> different categories of images (professional vs consumer)?
> Should a criteria of technology be the lengthening, rather than the
> shortening of photo image half-life?
> Is there anyone working on this issue with a mathematical or statistical
> model?
My scientific studies went like this:
Test No. 1.
Keep Ektachrome slides in damp basements, blazing hot/freezing cold
attics and garages for forty years. Keep Kodachrome slides in same
conditions for even longer.
Kodachrome slides look just fine. One of me when I was only two years
old - and I'm OLD geezer now - will print correctly with no blemishes.
Ektachrome slides are laced with fungus like a petri dish. Maybe good
sour-dough bread starter but not much else.
Test No. 2.
Many rolls of dad's 35mm, Agfa film from WWII coiled like a spring for
thirty-five years and then flattened out and stored between pages in
heavy art books. Still look OK except they curve width-wise.
Test No. 3
Wrap C.1900, 4 x 5 glass plate negatives inside newspaper for seventy
years. Pictures are a bit faded but printable. The newspapers are yellow
and a bit flaky but fully readable.
AZ
Build a 120/35mm Lookaround!
The Lookaround E-Book 5ed.
NOW SHIPPING
http://www.panoramacamera.us
> -------- Original Message --------
> Subject: [SPAM] [Fwd: Photography Half-Life (Decay Rate) Changes]
> From: steve harris <dshlaw@...>
> Date: Thu, June 25, 2009 12:11 pm
> To: List for Photo/Imaging Educators - Professionals - Students
> <photoforum@...>
> According to wikipedia at:
> http://en.wikipedia.org/wiki/Half-life
> The concept of half-life is often used to describe the decay of discrete
> entities, such as radioactive atoms. It is the time when the /expected
> value <http://en.wikipedia.org/wiki/Expected_value>/ of the number of
> entities that have decayed is equal to half the original number.
> The question is -- Has anyone on this list, or otherwise, done any
> studies on the half life of photographic images recorded on various media?
> The "decay" or loss of any given image could be from a number of causes
> -- decay of the recording material, destruction due to damage from fire,
> water, etc., discard by owner, change in technologies, etc.
> Do the members on this list think that the half-live of photo images has
> significantly shortened, because of the shift to digital? What about
> different categories of images (professional vs consumer)?
> Should a criteria of technology be the lengthening, rather than the
> shortening of photo image half-life?
> Is there anyone working on this issue with a mathematical or statistical
> model?
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