[argyllcms] Re: Best way to proceed?

On 2008 Jun 1, at 1:11 PM, Hal V. Engel wrote:
I guess the main point I was trying to make was that this specific issue is not a colorimeteric issue. Rather it is a lighting issue related to how that lighting interacts with the subject. Your three test photos clearly show how this interaction works. As such it is more about the ART of photography and I don't think there is any science that can be applied that will just "fix" it so that you can do exactly the same thing with each piece. Each of these pieces will respond to the light in different ways because that is the nature of the materials in the subject and the lighting that optimally brings out the grain and figure of one piece can be far from optimal for the next one. In fact in your sample shots it appears that even in the same piece that different parts of the piece need different lightling to get optimal results. Because of that you will need to either decide that you can ignore this aspect or that each subject needs to have different lighting to be shown it to it's best. This will be a challenge but it appears to me that you are up to learning about this and perhaps will come up with some systematic process that allows you to get near optimal results without too much effort. I wish I could be of more help but at least you now have an idea what it is you are dealing with and that is the first step in solving any problem.
Actually, that's exactly the advice I think I needed -- though I'm still really excited about Graeme's (indirect) suggestion of stereograms.
With the realization that getting a ``perfect'' match is impossible, I gave the i1 scan target another chance. And, it's actually not that bad, after all. When comparing a print with the art in shaded sunlight -- my SoLux lamp won't arrive until later in the week -- I could nearly match almost every portion of the piece to the print by tilting the piece at a suitable angle. It wasn't perfect, but can't be -- I now understand that. It certainly gets me very close, if it's not actually ``good enough.''
The lighting is going to be a bit more of a challenge. Stereograms will be easy -- just shoot with one light only, and then switch to the other light for the other frame.
Because of the confines of the space I'm working in -- my parents' garage for the large works, and my apartment kitchen for the few small ones -- I don't have much (any, really) room to move the lights from a standard 45o setup. I can, however, adjust the ratio of the lights. I've played around with it a bit already, and I think it'll significantly enhance the results. The one I've posted samples of probably needs about a 3 - 1 ratio, I think. 

Of course, it'll also seriously slow things down, but....

Cheers,

b&

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