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Re: Color question
David Fanning wrote:
> R. Kyle Justice (firstname.lastname@example.org) writes:
> > I guess there is a difference between a plot and an image
> > on a postscript device. Plots seem to use filled polygons
> > (which give pure colors) while images appear to use pixels
> > or dots.
> > SET_PLOT, 'PS'
> > DEVICE, Bits_Per_Pixel=8, /Color
> > TEK_COLOR ; or create your own discrete colormap
> > bar=BYTARR(200,1000)
> > FOR i=0,999 DO bar(*,i)=i*9/1000
> > TV, bar, /Device
> > PLOT, INDGEN(10), Color=7, Charthick=3, Thick=5, /Noerase
> > DEVICE, /Close
The immediate solution is to use *only* those colors as appear in
countours in the color bar.
And no for loops are needed. You could write:
or dispense with the chicanery altogether and simply use:
TV, bar, 0,0,XSIZE=.5,YSIZE=4,/inches
Using the /inches (or /centimeters) keyword to TV for postscript output
is highly advised.
I get the same pure yellow either way: #ffff00