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  1. #31
    ic-racer's Avatar
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    I agree that if one is asking about using a scanner as a densitometer then that is fair game here. To do it one would scan a step wedge with known values. The file is then can be opened in some graphics software like Photoshop. In Photoshop, each sector of the step wedge image can be interrogated with the "Information" window. The readout will be in "K" and it will be a percentage from 1 to 100.

    You will then plot the "K" value against the known density. Then you can use a graphing program to analyze the relationship between the two sets (ie derive an equation) and use this to convert from the "K" value to Log D.

    Densitometers are inexpensive, so it might be better to just get a densitometer.

  2. #32
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    Is a scanner a specialized digital camera?

    Is a scanner a traditional non-digital method?

    Do you guys expect Sushi at Mexican restaurants?

    APUG is special and successful because it is unique.

    Scanners don't read a spot and tell you it's at x density. The scanned file has to be prepped/fixed before it can even be measured. Are we going to allow tutorials in PS to make that workable for APUGers?

    Are we going to have tutorials for each model of scanner and brand of software and brand of film?

    The skill sets and tool sets required for traditional photographic processes and for digital are hugely different.
    Mark Barendt, Beaverton, OR

    "We do not see things the way they are. We see things the way we are." Anaïs Nin

  3. #33
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    Quote Originally Posted by markbarendt View Post
    Is a scanner a specialized digital camera?

    Is a scanner a traditional non-digital method?

    Do you guys expect Sushi at Mexican restaurants?

    APUG is special and successful because it is unique.

    Scanners don't read a spot and tell you it's at x density. The scanned file has to be prepped/fixed before it can even be measured. Are we going to allow tutorials in PS to make that workable for APUGers?

    Are we going to have tutorials for each model of scanner and brand of software and brand of film?

    The skill sets and tool sets required for traditional photographic processes and for digital are hugely different.
    I can't say that I disagree, or that you're wrong. I can understand your perspective. I think that the tools of the darkroom are always evolving though.

    My intention is definitely not to step on toes, or trample hallowed ground. I just want this community to thrive.

    A quote from Ansel Adam's introduction to The Negative, 1981 edition:

    I eagerly await new concepts and processes. I believe that the electronic image will be the next major advance. Such systems will have their own inherent and inescapable structural characteristics, and the artist and functional practitioner will again strive to comprehend and control them.
    If you are the big tree, we are the small axe

  4. #34
    Bill Burk's Avatar
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    Quote Originally Posted by markbarendt View Post
    Scanners don't read a spot and tell you it's at x density.
    Hi Mark,

    I agree that it is difficult to discuss scanners in APUG because of the risk of going off-topic. While I am contradicting this point, I don't expect you to know this in context of your analog commitment. So I'm just saying a scanner can do this.

    About a dozen years ago I bought a scanner which spends most of its time collecting dust. I was bothered by the user interface and found the software VueScan Professional solved my complaint (I have no relation to company). It works on many scanners.

    I thought it would be a cool feature request, so I asked if there was a way to use it as a densitometer and the answer I got surprised me. It can.

    Go into Prefs, choose Enable Density Display and press control key while moving mouse over the preview.

    Sure enough, it works adequately. The steps are: 1. Put neg in scanner 2. Launch VueScan 3. Preview 4. Read densities.

    So here is a chance for a piece of otherwise useless junk, to have a second life in the analog darkroom.

    The money that might have been spent on a densitometer, could be used towards another useful piece of analog equipment, a sensitometer.

  5. #35
    Bill Burk's Avatar
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    Quote Originally Posted by markbarendt View Post
    The skill sets and tool sets required for traditional photographic processes and for digital are hugely different.
    Mark,

    You are right on target here. My scanner trick is only good if you already have the skill and tool. Maybe since it's in my blood it's so obvious to me.

    Buying a junk scanner can be a money and time pit. For example the plug typically doesn't fit a printer port.

    ---

    I too come here for sanctuary from digital, so having made my point about scanners, I'll drop it (unless further clarification is needed) and just say that it is very satisfying for an analog darkroom worker to have functional equivalents of "sensitometer" and "densitometer" tools.

  6. #36

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    This all reminds me so much of my local Country Music Club. Try to play Blues or anything else not perceived as fitting the genre and there is always some Nazi who'll call out "That's Not Country". Needless to say the club consists of a rather small number of musical purists and has experienced no growth in recent years. Just sayin'.

  7. #37
    Diapositivo's Avatar
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    Talking about music, that reminds me of certain Alpine choirs which would object not just to performing non-Alpine popular songs (from Abruzzo, Sardinia, Latium etc.) but even to performing Alpine songs with modern harmonization. If one tights his trousers too much, he's going to end up suffocating, I say.
    Fabrizio Ruggeri fine art photography site: http://fabrizio-ruggeri.artistwebsites.com
    Stock images at Imagebroker: http://www.imagebroker.com/#/search/ib_fbr

  8. #38

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    Agreed. I like to think of the group as united by a common interested rather than a common list of topics which cannot be mentioned.

    This thread is a good example. Despite a chorus of take it to DPUG, I have learnt some cool ideas about using a scanner as a densitometer. I intend to use this information to start calibrating my relatively obscure film stock and improve my (once calibrated) entirely analogue workflow. Sounds like an ideal APUG conversation...

  9. #39
    markbarendt's Avatar
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    Quote Originally Posted by holmburgers View Post
    My intention is definitely not to step on toes, or trample hallowed ground. I just want this community to thrive.
    We have the same goal.

    Quote Originally Posted by holmburgers View Post
    A quote from Ansel Adam's introduction to The Negative, 1981 edition:

    I eagerly await new concepts and processes. I believe that the electronic image will be the next major advance. Such systems will have their own inherent and inescapable structural characteristics, and the artist and functional practitioner will again strive to comprehend and control them.
    Adams' goal was different. IMO he wasn't into "preservation of process" it was just about getting the output he wanted.

    Nothing wrong with that or with tools being updated.

    My point is not that the world shouldn't change. Metaphorically though if I want Sushi today choosing my favorite Mexican restaurant is asking for disappointment even if I think the place is a stellar restaurant.
    Mark Barendt, Beaverton, OR

    "We do not see things the way they are. We see things the way we are." Anaïs Nin

  10. #40
    richard ide's Avatar
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    You could also use a light meter as a densitometer. A spot meter is ideal but one could make a mask so that only a small area would be read by a meter with wider angle of view. Reference to step wedge readings should be very accurate.
    Richard

    Why are there no speaker jacks on a stereo camera?

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