Question 1 : How are you "measuring" the print in step 1?
Question 2 : How are you making a B&W photographic print from the
transparency? Do you have an enlarger? You print on Kodak or ILFORD or other
photographic paper? In a darkroom? With developer chemistry?
To me, the only relationship I can see here is "Original patch values"
(DeviceRGB or DeviceGray) to a print.
Seems to me, this fits the description of an Output profile.
/ Roger
-----Original Message-----
From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
On Behalf Of Yves Gauvreau
Sent: Saturday, November 18, 2017 9:42 AM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] How to do this?
I'm trying to find a way to do something like the following:
1- I have a patch sets, I print this on somekind of transparent
material.
I measure the resulting print,
Now I have the relation: original patch color => transparency
printed values, right?
2- I use this transparency as a negative to make a B&W photographic
print.
Then I measure the results of this B&W print.
And now I have the relation: transparency printed values (colors) =>
B&W photographic print values (grayscale), right?
Now using the above data, is there a way to convert a B&W original image to
the colored negative I need to print this image on photographic paper using
an ICC profile? How do I create one?
I see this here in Argyll docs, CCTIFF -> Color convert a TIFF or JPEG file
using a sequence of ICC device, device link, abstract profiles and
calibration files.
Some of you will ask why bother to do this, well all the methods I've seen
to create a digital negative as most of them call it, use a scanner as
measuring tool and none of them use any form of a ICC profile for this, just
curves inside Photoshop or again curves at the RIP level. It works and it
may be just fine.
I'm just curious to see if using another method and of course a profile
would be an improvement in any way shape or form.
Thanks in advance,
YG
