Re: Colorsync-users Digest, Vol 11, Issue 41
Re: Colorsync-users Digest, Vol 11, Issue 41
- Subject: Re: Colorsync-users Digest, Vol 11, Issue 41
- From: Louis Dina <email@hidden>
- Date: Fri, 11 Apr 2014 09:53:48 -0500
A little feedback. You may recall that I had a project to quantify colors
of metal samples, heat-treated at temperatures from 250°F to 600°F in 25°F
increments. The engineer in this project wanted to generate a color
accurate chart that would enable his people to assess the temperatures
products had experienced in service.
The samples were 1-½ inch diameter discs about 3/8 inch thick, and the flat
surfaces were polished nearly to a mirror finish. Not only that, but the
color after heat-treating was not uniform in all the samples, making a
difficult project essentially impossible.
I tried photographing the products under controlled lighting conditions
with very diffuse light, using multiple setups. I even constructed a light
tent in one setup. I used gray cards, color checkers and other known color
samples in the shots.
As I figured, and as most everyone here suggested, the task is essentially
undoable. I can make the metal objects any brightness I want my varying the
family of angles, diffusion, exposure, etc. I sent the photos to my
customer and explained why the project would only lead his engineers to
make incorrect assessments.
As suggested here, I recommended that he create a batch of samples and make
them available to his engineers, so they could compare the parts to real
live samples. He agreed that was the best solution and will proceed in that
manner.
Thanks for your feedback and recommendations.
Lou
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