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Write PNG from plots with different color tables?? [message #69873]

Tue, 02 March 2010 10:51

Mark Shephard
Messages: 13
Registered: July 1999

Junior Member

Hi all,

I need help! This should be very simple, but I cannot seem to find a
solution. I have having problems with the fact that I have two plots
using two different color tables that I would like to write into one
png file, but, write_png that only accepts one color table. Here is
an example outline:

set_plot, 'z'
;; load color table
loadct, 0
tvlct, r, g, b, /get

!P.BACKGROUND = 255 ;white

;;plot simple x,y plot
plot, x, y, color=1

;;read in gif image and colors
read_gif, image_gif, r_gif, g_gif, b_gif
TVLCT, r_gif, g_gif, b_gif

;;plot gif image
TVSCL, image_gif, 0.85,0.035, /normal

image = tvrd()
write_png, file_out, image, r, g, b

As you can see I have used two r,g,b, color palletes generating the
plots : r,g,b (black and white plot) and r_gif, g_gif, b_gif (from
gif image). This is fine until I need to generate a png file that
only takes one color table.

Any helpful tips?...Merge color tables? Somehow force both plots to
just the same color table (..no keyword option for read_gif)?

Thanks,
Mark

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[Message index]

		Write PNG from plots with different color tables?? By: Mark Shephard on Tue, 02 March 2010 10:51
		Re: Write PNG from plots with different color tables?? By: penteado on Wed, 03 March 2010 13:17
		Re: Write PNG from plots with different color tables?? By: David Fanning on Wed, 03 March 2010 11:48
		Re: Write PNG from plots with different color tables?? By: Mark Shephard on Wed, 03 March 2010 11:16

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