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| Re: Q: negative black & white image [message #6897 is a reply to message #6895] |
Mon, 19 August 1996 00:00  |
Christian Marquardt
Messages: 7
Registered: August 1996
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Junior Member |
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Hallo,
Runar J|rgensen wrote:
>
> Hi,
> I produce a black/white image using
>
> loadct,0
> tvscl,image
>
> What I want to do now is make an negative of this image.
> Any suggestions?
>
Try these:
tvlct, /get, r, g, b
r = reverse(r)
g = reverse(g)
b = reverse(b)
tvlct, r, g, b
You might not want to reverse all color indices in order not to change
fore- and background. You might also want to take of the color common
block...
Hope this helps,
Chris.
------------------------------------------------------------ ---------------
Christian Marquardt
Meteorologisches Institut der | tel.: (+49) 30-838-71170
Freien Universitaet Berlin | fax.: (+49) 30-838-71167
Carl-Heinrich-Becker-Weg 6-10 | email: marq@strat01.met.fu-berlin.de
D-12165 Berlin |
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| Re: Q: negative black & white image [message #6898 is a reply to message #6895] |
Mon, 19 August 1996 00:00 |
Liam Gumley
Messages: 473
Registered: November 1994
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Senior Member |
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Runar J|rgensen wrote:
> Hi,
> I produce a black/white image using
> loadct,0
> tvscl,image
> What I want to do now is make an negative of this image.
How about
tv,255-bytscl(image)
Cheers,
Liam.
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