image - Confusion with Gnuplot postscript terminal (CORRECTION : This is an issue with Mac Preview)

Question

I am confused about the how to get the postscript terminal to replicate a similar figure to the png terminal.

Here is my script:

#!/usr/bin/env gnuplot

#set terminal png 
#set output 'test.png'
set terminal postscript eps enhanced
set output 'test.eps'

set palette defined (0 1.0 1.0 1.0, 1e-19 0.0 0.0 1.0, 1 1.0 0.0 0.0)
set cbrange [0:9]
plot 'test.dat' u 1:2:($3 > 0 ? $3 : 0) with image

Here is my data file:

1.0  1.0  4.0
1.0  2.0  7.0
1.0  3.0  9.0
2.0  1.0  6.0
2.0  2.0  8.0
2.0  3.0  2.0
3.0  1.0  8.0
3.0  2.0  1.0
3.0  3.0  0.0

When I plot the data using the png terminal the edges between the cells are crisp. When I use the postscript terminal, the edges of the cells use a color gradient to transition between the colors of the cells.

Question: Is there a way to make the eps terminal so that it does not have a gradient of colors at the edges of the cells and replicates the crisp edges of the png image?

Answer 1

It turns out that Mac's Preview is having difficulty with dealing with the eps image. When viewed in TexShop generated pdf with Adobe Acrobat it is correct. Thank you Christoph.