Dear Logan,

I made some tests and I'm getting the same problem as the one described by you. Please take a look at my simple example:

<hansl>
open australia.gdt

series line1 = PAU        # black: #000000
series line2 = 0.1 * PAU # red:   #FF0000
series line3 = 0.2 * PAU # blue: #0000FF

# Color definition works!
gnuplot line1 line2 line3 \
{    set key left top;\
    set linestyle 1 lc rgb "#000000";\
    set linestyle 2 lc rgb "#FF0000";\
    set linestyle 3 lc rgb "#0000FF";}\
    --time-series --single-yaxis --with-lines --output=display

# Color definition works!
gnuplot line1 line2 line3 \
{    set key left top;\
    set linestyle 1 lc rgb "#000000";\
    set linestyle 2 lc rgb "#FF0000";\
    set linestyle 3 lc rgb "#0000FF";}\
    --time-series --single-yaxis --with-lines --output=logan.png

# Color definition doesn't work!
gnuplot line1 line2 line3 \
{    set key left top;\
    set linestyle 1 lc rgb "#000000";\
    set linestyle 2 lc rgb "#FF0000";\
    set linestyle 3 lc rgb "#0000FF";}\
    --time-series --single-yaxis --with-lines --output=logan.eps
</hansl>

I am using Gretl 1.9.11cvs on Windows Vista.

Best regards,
Henrique Andrade