[Gdal-dev] 1 and 4 bits image

[Sylvain Rioux]

Andrey,

First of all, I'm now able to read 1 and 4 bits images. Thanks to Frank for
his quick response, as always.

Yes, I'm a child of the Microsoft generation so you're right about the
Windows BMP format. I need to be able to read all the file formats GDAL is
able to read in order to develop a free software (available at the end of
June) that will be able to georeference a file from any source and output as
GeoTIFF (eventually any other formats I'll be able to write).

Thanks!

Sylvain

-----Message d'origine-----
De : gdal-dev-admin at remotesensing.org
[mailto:gdal-dev-admin at remotesensing.org]De la part de Andrey Kiselev
Envoyé : April 30, 2003 02:14 pm
À : gdal-dev at remotesensing.org
Objet : Re: [Gdal-dev] 1 and 4 bits image


Silvain,

On Wed, Apr 30, 2003 at 10:49:07AM -0400, Sylvain Rioux wrote:
> I am having trouble with 16-colors bitmaps (4 bits) and i was wondering at
> how GDAL manages this format. I get a bitmap where the pixels values seem
to
> have been slighly shifted and the result is far from what i expected. This
> problem does also occur with monochrome bitmaps. So far i successfully
read
> 256 colors bitmaps and, gifs, jpegs, and the other raster formats
supported
> by GDAL.It seems clear to me that the fact that the pixels are defined on
1
> or 4 bits rather than a byte causes this misalignment.

What file format do you mean as a ``bitmap''? MS Windows BMP?


--
Andrey V. Kiselev
Home phone:  +7 812 5274898  ICQ# 26871517
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