4 ms·
I think it may be more accurate to say perceptual description of luminance may be exponential (that humans report the difference from 1 to 1/2 as being the same
by jmount 13y ago
I think it may be more accurate to say perceptual description of luminance may be exponential (that humans report the difference from 1 to 1/2 as being the same as 1/2 to 1/4). But I think this is all irrelevant if you are trying to reproduce tones correctly (other than it says the error-model is relative error on tones). So I would say it takes a very labored reading to think of the article statement as correct (as light falls of 1/R^2 not exponentially). But that also makes the article's point: if you are painting what is there you are more immune to wrong assumptions.
- maaku 13y agoNot necessarily. If you are making a painting, you don't have the ability to make some sections literally brighter (higher luminescence) because you don't really have control over the lighting conditions, and oil paints only give you so much ability to adjust reflectance. So what you do is subtly adjust things like tone, texture, detail or technique to 'trick' the human perceptual system into thinking the difference is there. These tricks are what imparts that life-like quality into the old master's works.