I recently noted using Point Type 31 as symbols that some data points are usually displayed in a color slightly different from the one requested. This problem does not arise if I use Point Type 44. This is illustrated by this script:
==== colorpb.ppl ====
set terminal eps
set output 'colorpb.eps'
plot [0:0.5][0:0.5] 'colorpb.dat' using 1:2 with points pt 31 c skyblue title ''
=====================
In the resulting colorpb.eps file, although all symbols are blue as requested, the symbol corresponding to the first data point is significantly darker.
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I recently noted using Point Type 31 as symbols that some data points are usually displayed in a color slightly different from the one requested. This problem does not arise if I use Point Type 44. This is illustrated by this script:
==== colorpb.ppl ====
set terminal eps
set output 'colorpb.eps'
plot [0:0.5][0:0.5] 'colorpb.dat' using 1:2 with points pt 31 c skyblue title ''
=====================
with the following data:
==== colorpb.dat ====
0.2 0.3
0.205 0.31
0.19 0.29
=====================
In the resulting colorpb.eps file, although all symbols are blue as requested, the symbol corresponding to the first data point is significantly darker.