On 12/29/21 10:37 AM, George N. White III wrote:
Quoting the Postscript Reference Manual, 2nd Ed. (1995 13th Printing!) p
508:
setlinewidth:
A line width of zero is acceptable: It is interpreted as the thinnest
line that can
be rendered at device resolution -- in other words, one device pixel
wide. Some
devices cannot reproduce one-pixel lines, and on high-resolution
devices, such
lines are nearly invisible. Since the results of rendering such
"zero-width" lines
are device dependent, their use is not recommended.
I wonder how many people don't even know about them, and use them
without knowing it, as was the case for me.
My own experience: for many devices, the appearance of a specific pixel
depends on what is around it. On a crt, colors are generally generated by
some mix of RG and B pixels which may be rectangular. In print, colors are
often generated using half-tone methods. The appearance of a one-pixel
width line will vary with color choice.
Color perception is complex and tricky. I'm a long-time collector of
fluorescent minerals. My collection is big. Color perception is
important in this hobby. A book(*) that I read many years ago talked
about color perception. I remember context (my term) being a part of
that. Time also matters. Most monitors are sRGB, which covers less
than 50% of the range of colors people can see. I've longed for much
better color gamuts for monitors for a long time. No real chance until
there are ~550nm to ~400(?)nm and ~700(?)nm to ~550nm tunable lasers
that can switch both brightness and wavelength 50+ times per second, and
are less than ~50 micrometers across. (I'd hate to see the price of
that monitor!) I don't know what it would take to make an almost full
color gamut printer.
* "The Collector's Book of Fluorescent Minerals" by Manuel Robbins.
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