What's the real color of negatives?!

[Alessandro V.]

Hello everybody!

I have a question that has been my nightmare for some weeks now and, personally, I cannot find an answer...

The question is, as you can imagine, what's the real color of a negative image?
The problem, I guess, arise as there is this orange mask that is different, from what I have understood, for all the different film and I guess it could also change upon how well you have developed the film.

Personally I have developed 32 4x5 negatives for a project I am carrying on and, even if I I checked the temperature and times like never before during the developing of the films itself (with a Jobo CCP-2) when I scan it (Epson V750 plus Silverfast 8 calibrated with IT8) I get slightly different colors for each sheet of film. I don't understand if it is a problem of the film or a problem of the software...
This is driving me crazy...

Sometimes I read some topics where people debate on which should be the colors for some films and which should be not but the question I always ask myself is:
- 1 when you printed the negatives traditionally the final color of the print was not influenced by the printing process and materials?
- 2 Shouldn't we therefore accept different looks for the very same piece of film scanned in different ways?

If I am wrong and there is a true set of colors for each type of film how can we know we have scanned it correctly?
For example, sometimes, if I am not 100% sure about the scan of a B&W piece of film I scan it as a positive image and the I reverse it setting the white point on the markers on the film and the black one on the lateral stripes. But for negatives how do you do this? I've only ended up with very bad images when trying to apply this method to color negatives.

Thank you very much for your help!


Alessandro

PS: As I guess the topic might lead to some very complicated discussions, and I am not a color technician, I would really appreciate if everybody could keep a simple vocaboulary or, at least, explain the meaning of the super difficult words used.
Thank you!

[Mark Barendt]

Hi Alessandro

I do fine tune for each negative. Global adjustment only gets me through proofing.

What have found with digital is that it's never as simple as it seems it should be.

If you really want to learn the ins and outs of scanning and printing the link below is to a course available online and I've taken courses from Taz, he's good.

Lynda.com is great, you just pay by the month and get access to all their courses. When i was doing digital hot and heavy I had a subscription there for a year and a half I think, took lots of courses and it was worth every minute and every penny.

http://www.lynda.com/Design-Digital-...ducttypeid%3A2

[photobymike]

what kind of monitor and card are you using? sounds like your monitor has a automatic lightness adjust. some monitors when they change brightness they change color balance... VGA windows might be the culprit

[Walter Foscari]

Welcome to the world of digital color negs. If you're using a CPP with fresh C41 chemistry your development is probably fine. It's just the nature of color negs where the colors are inverted and compressed in such a narrow range. Correctly extracting those color with a scan is just not that easy.
Personally, for my scanning I rent an Imacon and gave up on trying to invert with the native software. Now I just save the raw scan (.fff files) import into PS and do all my work there. There are many tricks that can get you started (auto color, greypoint presets etc.) ultimately though it takes work and experience. Make sure you have a calibrated monitor, get a good PS book, and start practicing. After a will be amazed at how good you get.

W

[Brian C. Miller]

(Epson V750 plus Silverfast 8 calibrated with IT8) I get slightly different colors for each sheet of film.

Did you photograph the IT8 target with your negative film, process it in your Jobo, and then do the calibration with that target? What you might try is photograph the IT8 target a couple of times, and put that target in with two different batches. See if the results suddenly snap into line, as you may have a batch-to-batch problem instead of negative-to-negative problem.

Also, have you checked the CPP-2's temperature with a separate thermometer? I found that my CPP-2 is just slightly off.

[Alessandro V.]

Hello everybody and thank you for the answers!

Let's go in order:
Mark - thank you! I saw some video from Lynda before but I've never seen this one about scanning. I'll give it a try!

photobymike - I have personally color calibrated the monitor before starting the whole process of scanning. The automatic light adjustment is switched off and I've corrected the luminance of the monitor as well. I have a Mac Book Air, I guess it's not the best for this type of jobs but it's all I have... :-)

Walter - yes the chemistry was super fresh and I have used it just to develop the 4x5 sheets I am talking about. No other films.

Brian - I have a Silverfast IT8 4x5 (transparency) target made by kodak and I've used that for the calibration. I did not photograph and processed anything. Sorry but I did not understand the batches stuff... :-)
And, yes, I do check the temperature of my CPP-2 processor:
I have a digital termometer and two traditional ones. I've set everything so that the water that "hit" the rotating tank was 38.00 C° and the chemicals in the bottles a bit warmer (when you take them away from the processor to pour the content in the tank you loose temperature). And to be even more sure I've developed all the negatives during the same session without switching the Jobo CPP-2 off and then rewarming everything another time.
Going back to the IT8 target... what's the purpose of taking a picture of the IT8 target and then process it and scan it? I guess it's only to see if you are consistent with the development or not right? It's not to calibrate the scanner.
I thought about taking a picture of the IT8 wand then scan everything to trace the curves for that particular film BUT what's the point of shooting film if then I color correct everything to look like the real stuff? I would shoot digital then...or am I missing something?


Thank you very much for the answers!

Anyway, from a more general point of view, talking about colors, I still did not understand if the is ONE true negative or there might be different interpretation...
If there is only one, how can you know if you got it right or not once it's scanned?

[Ben Syverson]

(snip) I would shoot digital then...or am I missing something?

Alessandro, I think you are missing something. Either that or I don't understand what you're asking.

If what you want is the most accurate color representation, then you need to use and understand calibration targets. You're right that digital is a bit easier since it's already in the ballpark.

If you just want a nice image, then shoot film and don't over think it. As far as I'm concerned, there is no "right" interpretation of a color negative. Even RA4 (photochemical C-print paper) alters the characteristic curve in a way which is not strictly accurate.

[Brian C. Miller]

The purpose to photographing an IT8 target is to establish a specific color profile for an image path. My target is printed, so I photograph the target, process the film, scan it, and then I create a color profile for that path of film to scanner to file. If I used a digital camera, I would photograph the target with the digital camera, and then create the color profile from the resulting file for all images from that particular digital camera.

For troubleshooting your situation, I would first start with one negative with the IT8 target in a processing batch, and see if all of the negatives in that batch were correct for their color. If all of the negatives are good for the batch, do it again with the next batch, and compare the two IT8 targets. They should match each other.

Of course, this presumes that all of the negatives were shot in roughly the same sort of light. When I bought a used Gossen meter, a color meter was included. The meter really showed me just how wildly color light can vary.

As for the "ONE true negative," yes, it does exist. It was handed to George Eastman and the Lumière brothers, not long after Moses received the Ten Commandments. It is kept in the Chauvet caves in France, protected by the Knights of the Holy Silver, and the Lone Ranger. The uninitiated must pass several trials before they see it, starting with getting past Tiny Tim and Jerry Lewis. Another of the trials is the Internet Troll at the cafe, and that's also brutal. Everybody else just mail orders a copy from Germany.

[gary mulder]

I still did not understand if the is ONE true negative or there might be different interpretation...

Sorry no. The negative will differ according to the color temperature of the light in which it was taken. Developing with c-41 is pretty consistent. If you do not over use the chemicals. Personally I use one liter developer for 24 sheets 4x5, one shot. (6 in 250 ml )
Remember chemicals are cheap compared to film.
I have a Imacon but never got it really right with color neg. Maybe I am to much a darkroom man.

[Bruce Watson]

...what's the real color of a negative image?

There's not one. And you can't force one to exist no matter how much you demand it. Sorry.

The orange mask serves many functions, one of which is color correction. That orange mask is one of the reasons that negative films have more accurate color than transparency films (don't believe me? Fine. Go to APUG and ask PhotoEngineer, a retired film design engineer from Kodak. That's where I got my information on this). Clearly, since the colors in each scene vary, the color of the orange mask also varies. Like snowflakes, no two are ever exactly alike.

You can't create an ICC profile for a scanner scanning negative film. It's undefined. The orange mask, for one thing. The much much larger variation in density range from frame to frame for another.

There are a lot of reasons to use negative films over tranny films. I personally never use tranny films for anything, and haven't for most of a decade. But you do have to treat every frame individually, in scanning just like in the darkroom.

Stop fighting it. Learn to love the individual nature of it. Your attitude will improve, and your image quality will also improve. Been there and done that.