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paint mixing, named colors
On 04/20/2015 01:26 AM, isw wrote:
Look up "metamerism". yes ... you could do mixing from spectral data to avoid metamerism -- Dale http://www.dalekelly.org |
#2
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paint mixing, named colors
In article , Dale
wrote: On 04/20/2015 01:26 AM, isw wrote: Look up "metamerism". yes ... you could do mixing from spectral data to avoid metamerism But it would be *really difficult* if you could not identify the specific colorants from their spectra (impossible?). And, of course, you'd be unlikely to have every possible item on hand anyhow. Possible in theory, not very likely in practice. Isaac |
#3
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paint mixing, named colors
On 04/24/2015 11:44 PM, isw wrote:
In article , Dale wrote: On 04/20/2015 01:26 AM, isw wrote: Look up "metamerism". yes ... you could do mixing from spectral data to avoid metamerism But it would be *really difficult* if you could not identify the specific colorants from their spectra (impossible?). And, of course, you'd be unlikely to have every possible item on hand anyhow. Possible in theory, not very likely in practice. Isaac colorimetry alone would get you to "good enough color", accurate enough too edit from -- Dale http://www.dalekelly.org |
#4
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paint mixing, named colors
In article , Dale
wrote: On 04/24/2015 11:44 PM, isw wrote: In article , Dale wrote: On 04/20/2015 01:26 AM, isw wrote: Look up "metamerism". yes ... you could do mixing from spectral data to avoid metamerism But it would be *really difficult* if you could not identify the specific colorants from their spectra (impossible?). And, of course, you'd be unlikely to have every possible item on hand anyhow. Possible in theory, not very likely in practice. Isaac colorimetry alone would get you to "good enough color", accurate enough too edit from Under very controlled lighting, true. Isaac |
#5
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paint mixing, named colors
On 26/04/2015 05:00, isw wrote:
In article , Dale wrote: On 04/24/2015 11:44 PM, isw wrote: In article , Dale wrote: On 04/20/2015 01:26 AM, isw wrote: Look up "metamerism". yes ... you could do mixing from spectral data to avoid metamerism But it would be *really difficult* if you could not identify the specific colorants from their spectra (impossible?). And, of course, you'd be unlikely to have every possible item on hand anyhow. Possible in theory, not very likely in practice. Isaac colorimetry alone would get you to "good enough color", accurate enough too edit from Under very controlled lighting, true. Isaac As a part of the UK National Gallery's "Making Colour" exhibition last year they had an old master and a fake exactly matched for 2700K incandescent room lighting in a lecture room where the lighting conditions could be varied to simulate everything from natural full sunlight to fluorescent lamps. The experiment which involved public participation isn't shown on summary which concentrates only on the exhibits in the exhibition rather than the modern demo forgery. http://www.nationalgallery.org.uk/wh.../making-colour Part of the interactive test was to determine proportion of people who were colour blind and to what extent and then who could see what. There were startling differences between the two under the right lighting. -- Regards, Martin Brown |
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