Re: COlor Picker seems odd at highest and lowest values in gradient section
Posted by
Michael Schmid on
Aug 31, 2020; 3:51pm
URL: http://imagej.273.s1.nabble.com/COlor-Picker-seems-odd-at-highest-and-lowest-values-in-gradient-section-tp5023896p5023898.html
Hi everyone,
my 3 cents: I think it would be even nicer to have an area a few pixels
wide for picking black or white.
Michael
________________________________________________________________
On 31.08.20 15:45, Bill Christens-Barry wrote:
> Hi,
>
> I've noticed what I think is a changed behavior of the Color Picker concerning its leftmost section that displays as a grayscale gradient. In that section, low values are displayed as dark at the top and high values displayed as light at the bottom.
>
> In macOS 10.14.6 (Mojave), to pick the lowest value (0) you must pick just beneath the highest value in the gradient. The lowest value that can be picked at the top of the gradient is not 0 but is 1. This behavior also holds for different image types and how their values are displayed numerically. Moreover, if you click in the regions above or beneath the gradient near its lowest or highest values, the lowest non-zero value (1) or the highest value (255), respectively, is selected.
>
> This seems counterintuitive; would it be better to have the lowest value be at the top of the gradient region? I wonder if this might be a regression, perhaps due to a non-zero based 8-bit index rollover (255 + 1 = 0).
>
> On Windows 10 this behavior is slightly different.
>
> Bill
>
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