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Re: color tiffs [message #72365 is a reply to message #72364]

Sat, 04 September 2010 09:57

David Grier
Messages: 35
Registered: July 2010

Member

On 9/4/10 12:43 PM, Hawaiianite wrote:
> I can't seem to get tiffs written out in color. Silly, but true.
>
> IDL> write_tiff,'title',(array[*,*,2]),/float
>
> I get a grey scale image even when I've set device,decomposed=0 and
> loaded a color table (39). The resulting file is larger compared to
> the black and white tiffs I produced with bytscl'ing', but it is not
> in color. Any suggestions?
>
> Thanks!

How about ...

IDL> write_tiff, 'title', array[*,*,0:2], /float

The command you provided above creates a tiff image with only one color
channel (index 2), and thus yields a grayscale image. Storing
a color image requires all three color channels, which I assume
are in indices 0, 1, and 2 of "array". I also assume that you're not
using indexed colors because you're storing pixels as floating-point
values. If you were using indexed colors, you'd have to save the
color table in the write_tiff command.

The floating-point image created by your command is larger than a
bytscl'ed image because each floating-point pixel requires 4 bytes (?),
whereas each bytscl'ed pixel requires just one.

TTFN,

David

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[Message index]

		Re: color tiffs By: penteado on Sat, 04 September 2010 10:14
		Re: color tiffs By: David Grier on Sat, 04 September 2010 09:57
		Re: color tiffs By: jtmcahill on Fri, 17 September 2010 07:22

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