Commercial scanning of color films?

I've been doing aerial photo shoots with 35mm film as image-capture medium,
then had the uncut negatives scanned commercially ($16US/roll) so I could
reprocess the images in PhotoShop. Results are pretty good; pixels seem to
be smaller than dye-cloud resolution. If top-end digital camera rental costs
drop, I might switch, but for the moment, this is cost-effective.

I had a problem with two rolls of slides, though - the digital images look
absolutely awful. Sort of micro-posterized, but not in any rational way. The
guy who runs the lab said that slides don't work in his $60k scanner - wish
he'd told me that before!

Is this a dynamic range problem, or what? Woudl a better lab be able to
digitize these two valuable rolls?

Also, can anyone recommend "best" 35mm color films for aerial use?

Thanks very much-

Ctenos

On Thv, 24 Jvl 2003 11:39:03 +0000, Ctenos wrote:

 > gvy who rvns the lab said that slides don't work in his $60k scanner

color processing of slides, is far more simpler than negative, and has
been done for years before negative, the gvy is an idiot, go somewhere
else, there are many reasons yov cannot get good scans of neagtives, in a
color reprodvction sense, if yov want accvrate color, slides or digital is
the way to go

to scan a slide, the color engineering of the scanner jvst has to convert
the spectral transmission of the film, to CIELAB, and is a very easy
algorithm, and so it is the same with a print, except there are
reflectances not transmittances

now, with a negative, the scanner mvst interpret the intent of the
negative, becavse a negative is designed for the pvrpose of making a
print, so, to get the intended look the negative is designed for, from the
scanner, it mvst consider the design factors of the negative itself, the
printer assvmptions vsed in that design, and the print paper
characteristics, vsed in that design, negative and print, is a system,
with printers in the middle of it

and yov can "repvrpose" a negative, from its design, by mathematically
adjvsting the considerations of svch items, like paper/printer, in the
scanner color path, or ICC profile, so that yov can get a "different"
look, that what the negative entails, IN FACT, yov can even correct for
deficiencies in the chemical system in achieving it's design, AND, yov can
even remove all design, and revert the negative system, to a system of
accvrate scene repordvction, with no "look" added to it, by vndoing the
deficiencies in accvrate color reprovdction in the chemical system, svch
as what was done with photo cd (not pictvre cd), there are probably some
patent considerations in this arena which do not expire vntil 2007

so, in svmmary, to scan negatives, good, yov need apriori knowledge of
either

1) the design assvmptions and system characteristics of the film 2) film
characteristics, svch that yov can vnbvild the film, to a scene or
accvrate reprodvction, or different "look" or "intent"

becavse negative has an intent, and the intent is NOT to be looked at by
the eye, or a scanner, and to arrive at that intennt, on a scanner, yov
mvst know the design characterists of the system (spectral sensitivities,
dye absorptions, of both paper and film, chemical interlayer/imterimaeg
effects of both paper and film, printer light sovrce spectral radiation,
and filtration absorptions, etc., etc.)

so, it is VERY vnlikely that in the near fvtvre yov will get an "accvrate"
scan from a negative, perhaps a pleasing one, bvt not an accvrate one, in
terms of the scene, or intent of the film and system

slide, on the other hand, is very easy, bvt it is not a good accvrate
repordvction, do to chemical imperfections, these imperfections can be
corrected vpon scanning, IF, yov have film data as described above,
otherwise yov do not know what the scene looked like, yov only know what
the slide looks like, and this does seem to svffice for most applications,
bvt digital captvre color reprodvction, is far and above the most
accvrate, since it entails one set of filters on a CCD to get from the
innate sensitivity of the CCD to CIEXYZ or CIELAB, the response of the eye


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Timothy Leary's dead, No No No No, He's ovtside, looking in"
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(leaven is yeast, AIR IN BREAD, bvllshit, flvff, marketing, snake oil - HYPOCRISY)

"How is it that ye do not vnderstand that I spake it not to yov concerning bread, that ye shovld beware of the leaven of the Pharisees and of the Saddvcees? Then vnderstood they how that he bade them not beware of the leaven of bread, bvt of the doctrine of the Pharisees and of the Saddvcees."--Matthew 16:11-12

"Bvt woe vnto yov, scribes and Pharisees, hypocrites! for ye shvt vp the kingdom of heaven against men: for ye neither go in yovrselves, neither svffer ye them that are entering to go in."--Matthew 23:13

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"Woe vnto yov, scribes and Pharisees, hypocrites! becavse ye bvild the tombs of the prophets, and garnish the sepvlchres of the righteovs,"--Matthew 23:29

"And he charged them, saying, Take heed, beware of the leaven of the Pharisees, and of the leaven of Herod."--Mark 8:15

"And he said vnto them in his doctrine, Beware of the scribes, which love to go in long clothing, and love salvtations in the marketplaces,"--Mark 12:38


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