| Any suggestions for a B&W colour scheme for publication images? [message #55943] |
Tue, 25 September 2007 07:25  |
Tyler
Messages: 5
Registered: September 2007
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Junior Member |
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Hello All:
I am in the process of submitting some figures to a journal for
publication (it has been accepted). I intend to save my supervisor
cash by submitting B&W figures for print, and keep the colour images
for the electronic version.
Here is my problem. Originally, I've been using one of the EOS colour
schemes and the figures turn out great. There is excellent contrast
between regions, and the positive/negative values are clearly
distinguished. Sadly, switching the colour scheme to B&W tends to blur
these crucial distinct regions.
I have tried several values for STRETCH. Perhaps I was not using the
STRETCH command properly. Does anyone have any suggestions for values
of STRETCH or GAMMA_CT that have worked for their own publications in
the past? This problem is only further compounded by the fact that
XLOADCT seems to not want to load from my IDL script file, so I'm
limited to what I can do from the within the script.
For what it's worth, I have several figures to convert to B&W, all of
which have different maximums and minimums. Can I use that knowledge
to control STRETCH/GAMMA_CT with these values?
I have two example PNG files I can send to anyone if they would like
to see what I am talking about. Just email me with "GAMMA_CT" in the
subject heading.
Any ideas are greatly appreciated.
Cheers,
t.
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| Re: Any suggestions for a B&W colour scheme for publication images? [message #56065 is a reply to message #55943] |
Thu, 27 September 2007 14:42  |
little davey
Messages: 5
Registered: June 2007
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Junior Member |
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On Sep 25, 9:25 am, Tyler <hayes.ty...@gmail.com> wrote:
> Hello All:
>
> I am in the process of submitting some figures to a journal for
> publication (it has been accepted). I intend to save my supervisor
> cash by submitting B&W figures for print, and keep the colour images
> for the electronic version.
>
> Here is my problem. Originally, I've been using one of the EOS colour
> schemes and the figures turn out great. There is excellent contrast
> between regions, and the positive/negative values are clearly
> distinguished. Sadly, switching the colour scheme to B&W tends to blur
> these crucial distinct regions.
>
> I have tried several values for STRETCH. Perhaps I was not using the
> STRETCH command properly. Does anyone have any suggestions for values
> of STRETCH or GAMMA_CT that have worked for their own publications in
> the past? This problem is only further compounded by the fact that
> XLOADCT seems to not want to load from my IDL script file, so I'm
> limited to what I can do from the within the script.
>
> For what it's worth, I have several figures to convert to B&W, all of
> which have different maximums and minimums. Can I use that knowledge
> to control STRETCH/GAMMA_CT with these values?
>
> I have two example PNG files I can send to anyone if they would like
> to see what I am talking about. Just email me with "GAMMA_CT" in the
> subject heading.
>
> Any ideas are greatly appreciated.
>
> Cheers,
>
> t.
My non-expert observation is that B&W is different from color in that
as soon as you put black pixels on the page or screen, it is DARKER
than you think it would be. That is, if you have say 5 regions,
shading them at 20%, 40%, 60%, 80%, and 100% appears to be awfully
dark. It ends up better doing something like 10% 20% 35% 55% 75%.
Just having a black speck in a small area seems to make it "blacker"
than you might have expected.
Also, I found it hard to have even 6 different gray shades, but you
may have better luck.
-- Dave K --
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| [My SOLUTION] Any suggestions for a B&W colour scheme for publication images? [message #56129 is a reply to message #56065] |
Mon, 01 October 2007 17:14 |
Tyler
Messages: 5
Registered: September 2007
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Junior Member |
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First off, thanks for the numerous replies. I'm posting below what
works for my purposes, albeit somewhat crude.
Basically, what I did was shift every 8th colour to be darker by "8",
i.e.,
TVLCT, 0,0,0,7
TVLCT, 7,7,7,15 .... &c.
I had thought about reversing the colours, e.g.,
TVLCT, 248,248,248,7
TVLCT, 239,239,239,15 .... &c.
But reckoned it made the plot a little too motley.
Here is the code snipet that works for my purposes contouring the data
set I have. Let me know what you think and I hope it helps someone
else.
Cheers,
t.
-------------------- 8< ------------------------
ctable = 0 ; B&W colour scheme....
LOADCT, ctable
PRINT,'Creating B&W plot suitable for print with LaTeX'
;; Shift middle colours only
FOR i = 1, 30 DO BEGIN
ncol = (i*8) - 1
ocol = (i-1)*8 - 1
IF (ncol LT 0) THEN ocol = 0
TVLCT, ocol, ocol, ocol, ncol-1
TVLCT, ocol, ocol, ocol, ncol+1
TVLCT, ocol, ocol, ocol, ncol
ENDFOR
-------------------- 8< ------------------------
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