[Mapserver-users] Raster geotiff turns background yellow

[Ed McNierney]

Randy -

Can you describe exactly what you did differently between those two images?

Can you reproduce the problem with a single MAP file in which the troublesome layer is turned on and off via a LAYER= querystring parameter?

I'm suspecting that the image itself is NOT the problem at all, but that the yellow is an artifact of something else that's happening at the same time.

	- Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
ed at topozone.com
(978) 251-4242 

-----Original Message-----
From: randy james [mailto:rjames57 at yahoo.com]
Sent: Tuesday, January 28, 2003 1:37 PM
To: Mapserver Users
Subject: RE: [Mapserver-users] Raster geotiff turns background yellow


Hi List

Well i am still having the problem of a projected
geotiff file changing the output of the mapserver cgi:
the background turns yellow.

I've tried

 importing and than exporting the image through GRASS

 tiff2bw to ensure the file is grayscale

 upgraded to the remotesensing site version of GDAL
1.1.7.1 from the Mandrake 8.2 version of 1.1.7.

The geotiff image seems to be exactly like the ones
that do not cause the problem.

i am including a couple of files from the tmp
directory, one where the background is yellow and one
where it is not.

does anyone know what next i should check?

--- Ed McNierney <ed at topozone.com> wrote:
> Randy -
> 
> Is it possible for you to make the GeoTIFF
> available?  Thanks.
> 
> 	- Ed
> 
> Ed McNierney
> President and Chief Mapmaker
> TopoZone.com / Maps a la carte, Inc.
> 73 Princeton Street, Suite 305
> North Chelmsford, MA  01863
> ed at topozone.com
> (978) 251-4242 
> 
> -----Original Message-----
> From: randy james [mailto:rjames57 at yahoo.com]
> Sent: Monday, January 27, 2003 12:35 PM
> To: Mapserver Users
> Subject: Re: [Mapserver-users] Raster geotiff turns
> background yellow
> 
> 
> Hi List
> 
> I checked the geotiff file in the GIMP and it did
> not
> have any yellow in the image. But than i checked the
> image created by Mapserver and it has the yellow
> background on it. Soo i assume that the cgi is
> creating the yellow. Also i noticed that the polygon
> layer loaded before the geotiff has changed to the
> grayscale color of the geotiff.
> 
> I am sending the rendered imaged created by
> mapserver
> cgi for review.
> 
> Cheers
> Randy
> 
> --- woodbri at swoodbridge.com wrote:
> > Randy,
> > 
> > I assume that the color change is taking place
> when
> > view in a 
> > browser? Have you tried to view it in an image
> > viewer?
> > 
> > Sometimes the browser pre allocates an bunch of
> > colors and when you 
> > load the geotiff, it does not have enough slots in
> > the color lookup 
> > table and has to assign the additional colors to
> > existing ones. Some 
> > software is better at this than others, but it is
> > typically the 
> > reason why your get the type of color change you
> > described.
> > 
> > -Steve W.
> > 
> > On 24 Jan 2003 at 14:51, randy james wrote:
> > 
> > > Hi list
> > > 
> > > Has anyone experienced problems with a geotiff
> > file
> > > making the image background turn yellow? (or any
> > > color)
> > > 
> > > The orthophoto (geotiff) that causes the problem
> > is my
> > > fist attempt at projecting a raster on the fly.
> I
> > have
> > > tried importing the ortho into GRASS and than
> > > exporting it again, but it did not make a
> > difference.
> > > 
> > > The gdalinfo utility output is quite large for
> the
> > > ortho causing the problem, but once its exported
> > from
> > > GRASS it is the same as the orthos that work (i
> > think)
> > > 
> > > I'm wondering if its something to to with
> > projecting a
> > >  raster or is it the file format. I will read
> and
> > try
> > > the gdal_translate utility next i guess
> > > 
> > > MapServer version 3.6.4 OUTPUT=PNG OUTPUT=JPEG
> > > OUTPUT=WBMP SUPPORTS=PROJ SUPPORTS=TTF
> > > SUPPORTS=WMS_SERVER INPUT EPPL7 INPUT=JPEG
> > > INPUT=POSTGIS INPUT=GDAL INPUT=SHAPEFILE
> > > 
> > > Cheers
> > > Randy
> > > 
> > > 
> > >
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