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Hi,

I need to convert a 24-bit RGB TIFF image to an 8-bit RGB TIFF image.
I've tried using PIL and the convert() method - this allowed me to
convert to an 8-bit grayscale image, close but not exactly what I need


From what I've read, it doesn't look like I can do what I need in PIL.
Does anyone know of another method ?

Thanks,

Alastair.

I think you could use netpbm to do the conversion.

http://netpbm.sourceforge.net/

I use it for a lot of my TIFF-work that PIL just
doesn't yet support. Wrap a function/class around
an os.system() call to execute it if you want to
call from Python.

HTH,
Larry Bates
Syscon, Inc.

"alastair" <> wrote in message
news: om...
> Hi,
>
> I need to convert a 24-bit RGB TIFF image to an 8-bit RGB TIFF image.
> I've tried using PIL and the convert() method - this allowed me to
> convert to an 8-bit grayscale image, close but not exactly what I need
>
>
> From what I've read, it doesn't look like I can do what I need in PIL.
> Does anyone know of another method ?
>
> Thanks,
>
> Alastair.

On 12 Jul 2004 07:57:40 -0700, (alastair)
declaimed the following in comp.lang.python:

> Hi,
>
> I need to convert a 24-bit RGB TIFF image to an 8-bit RGB TIFF image.

Pardon? The only color 8-bit formats I'm familiar with are those
using indexed color (primarily GIF, though PNG may also have that mode).
You are limited to only 256 discrete colors.

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> | Wulfraed Dennis Lee Bieber KD6MOG <
> | Bestiaria Support Staff <
> ================================================== ============ <
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alastair wrote:

>Hi,
>
>I need to convert a 24-bit RGB TIFF image to an 8-bit RGB TIFF image.
>I've tried using PIL and the convert() method - this allowed me to
>convert to an 8-bit grayscale image, close but not exactly what I need
>
>
>

With the caveat expressed above (that there may well not *be* such a
thing as an 8-bit RGB TIFF), you may want to look into using ImageMagick
(and the Python API for it) for your image manipulation. See
www.imagemagick.org for more information.

Jeff Shannon
Technician/Programmer
Credit International