Re: [ gnuplot-Bugs-1575425 ] "with image" ignores gamma for postscript output (fwd)

[Ethan M. <merritt@u.washington.edu>]

On Wednesday 11 October 2006 10:07 am, Petr Mikulik wrote:
> I have just filled in the enclosed bug (announced to me by another
> gnuplot user) ... could someone figure out an appropriate "filter"
> for the postscript "image" operator so that the gamma correction
> works also for "with image" as it works for "with pm3d"?

Shouldn't the gamma be a per-image correction rather than something
to do with the current palette?  I would have thought that the
gamma correction belongs in the routine that reads in the data.
That makes it terminal-independent.




>
> Thanks, Petr
>
> ---------- Forwarded message ----------
> Subject: [ gnuplot-Bugs-1575425 ] "with image" ignores gamma for
> postscript output
>
> https://sourceforge.net/tracker/?func=detail&atid=102055&aid=1575425&
>group_id=2055 Summary: "with image" ignores gamma for postscript
> output
>
> Initial Comment:
> Setting of "palette gray gamma <g>" is ignored for
> "with image" output into a postscript file (it is ok
> for "with pm3d"). The following script demonstrates this:
>
> set table "t.dat"; splot x; unset table
> reset
>
> set autoscale fix
> set palette gray gamma 0.2
>
> plot "t.dat" with image
> #set term post color eps "Helvetica" 25
> set term post mono eps "Helvetica" 25
> set output  "t.eps"
> replot
> set out; set term pop
>
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-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle WA