Question of the Day
The human eye can see a hundred shades of grey.
The human eye can detect different shades of grey depending on its brightness. 1% of brightness is enough for the human eye to recognise a different shade.  More »
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www.ncbi.nlm.nih.gov/pmc/articles/PMC3043920/
On the other hand, we see that these images are visualized by means of medical ... As a first step, we will investigate how many shades of gray a human observer ... Figure 2 also indicates that the human eye is relatively less sensitive in dark ...
www.ijri.org/article.asp?issn=0971-3026;year=2007;volum...
However, more shades of gray are required in medical imaging and ... It describes the ability to distinguish fine spatial detail and to differentiate objects .... The human eye can discriminate many more shades of color than it can shades of grey.
www.dentalxrays.info/blog/more-50-shades-grey
13 Jun 2012 ... Furthermore, the actual number of meaningful shades of grey is difficult to ... on the human observer as much as the quality of the actual image. The human vision can only distinguish between 32-64 shades of grey at any time ...
photo.stackexchange.com/questions/10208/how-many-colors...
27 Mar 2011 ... How many colors and shades can the human eye distinguish in a single scene? .... How many levels of intensity can the eye really see, vs. how many .... How does the gray level in a target impact the true color after calibration.
... CO2 reduction; 1.4 Which Insect is this ? 1.5 How many shades of gray can the human eye see? 1.6 Which large predators can't see you if you don't move? More
Source: Wikipedia