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[filmscanners] Re: Scanning chromogenic

One of the reasons these chromogenic C-41 based films were created was
so that people could get results without having to get what is now
"special processing" using black and white chemistry, allowing for quick
results at any lab offering color neg processing.

They have an added advantage of having non-silver grain, allowing for
softer grain patterns, which some people prefer over "hard" grain.

Even many higher end labs do not offer black and white developing or
printing on site, because the demand is low, so they contract it out, or
only offer it on a weekly basis.  Often this means long waits for results.

Use of C-41 based chromogenic films means they can be both developed and
printed using standard color chemistry and paper.  Even the ones lacking
the standard dye coupler base could be printed fairly neutrally if the
filter pack was set properly.


Anthony J. Terlecki wrote:

> On Tue, Jan 29, 2002 at 10:33:19PM -0800, Ken Durling wrote:
>>Hi folks -
>>I had never tried any of the C-41 films before, and just shot a roll
>>of XP-2.  At the processing place I had them print it on color paper,
>>and the prints have that sepia tone that I associate with the type.
>>However, nothing I do in Vuescan results in anything but a straight
>>greyscal image, leading me to believe that there's something I don't
>>understand about this film (no surprise).  So where does the sepia
>>toning come from?  Is it possible to obtain a scan that has it?  I
>>thought it was in the negative, but perhaps it's exclusively in the
>>chemical interaction with paper?
> The straight greyscale scan is correct as is the sepia tone when printed
> onto colour paper. XP2 is designed to be printed on traditional black and
> white paper. The sepia tone is there because the paper is trying to
> compensate for an orange mask on the film which isn't present. If you want a
> true black and white print on colour paper then you might want to look at
> the Kodak chromogenic offering which has an orange mask. XP2 is a brilliant
> B&W film for scanning because you don't have to mess around with that orange
> mask and you get to use the IR channel (if your scanner has one). At the lab
> you just have to ask them to print it on black and white paper.
> --
> Tony Terlecki
> ajt@mrps.demon.co.uk

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