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

[Petr M. <mi...@ph...>]

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"?

Thanks, Petr

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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