Characteristic curves for Fuji colour negative filmsin Academic
By fabricator4/Chris (3,025)
on August 20, 2005 11:00:35 AM CDT
Characteristic curve plot of Fuji Superia 400. I hope to add other Fuji print films over time and do useful comparisons. Just for fun I've included a comparison curve for the 10D
All sensitometry I do is using an Epson 2480 photo scanner and the densitometer function in Epson Scan v.2.50E. This providesconsistant and meaningful results for me in digital post production , however the results may not be the same as using a densitometer and conventional darkroom processes. The data is as acurate as I can make it, and the analysis is based on my experience: use it at your own risk. For further information on methodology see my other articles and journal entries, particularly How to analyse B/W negatives with a scanner and plot characteristic curves.
Characteristic curves for colour film have been done based on luminosity only, unadjusted for base film colour and fog levels. The base fog level represented here therefore includes the base film colour. The purpose of these characteristic curves is to demonstrate exposure characteristics and give a better understanding to enable photographers to improve the likelyhood of ideal exposures.
Fuji Superia 100 [CN]
Fuji Superia 400 [CH]
At first glance a fairly standard 'S' curve however the straight section of the curve does not start until zone 2 level exposures are reached. This leads me to believe that shadow detail in the zone 0,1,2 levels might be poor and difficult to scan.
The straight section of the curve can only be considered linear from zones 2 through 6. Film response from the dark to mid-tone areas would therefore be quite natural.
A gradual falloff in the highlight curve from zones 7 to 10 means that this compression of highlight exposure would make it easier to naturally represent highlight detail in a scan and would be considered a desirable characteristic for most exposures. The compression would however make it slightly more difficult to render graduated tonal ranges around zone 9 - paper white.
I'm quite pleased with this curve because it does fit well with how I currently calculate exposures based around skin tones and highlight detail. In low level flat lighting the film has enough latituded for a one stop over exposure, which would enable more shadow detail to be recorded if this is considered pertinent.
I wanted to do some relative comparisons with other films to show how the exposures characteristics differ. I'll add some more in as I get time. For now I thought it might be fun to compare the Superia 400 to a Canon D10. Here it is, just for fun.
The digital data was adjusted to coincide with the zone 0 exposure of the Superia 400 to give a relative comparison. Don't read too much into this as the digital data is flawed in some respects - I'm still trying to get some good data. One thing that is fairly clear however is that the digital is not very forgiving with respect to highlight detail, which we all know anyhow...
I have just shot some set of test exposure for Fuji Superia 100 and Konica SX 100 which will be developed this week. I hope to have all the data up by the weekend. I've heard the Konica suffers from batch inconsistancies and I wouldn't use it normally, but a supplier threw a roll at me recently...
References and Links
Konica colour VX 100 data sheet. PDF file
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