Transparent raster layer (with Jpegs source rasters)

[Pedro Mendes]

Hi people,

I´m trying to display a raster layer from a tileindex file (.shp). The
source rasters for this shapefile are jpeg with the following info:

Driver: JPEG/JPEG JFIF
Size is 6401, 4001
Coordinate System is `'
Origin = (-15999.111000000001000,100001.744000000010000)
Pixel Size = (2.500000000000000,-2.500000000000000)
Corner Coordinates:
Upper Left  (  -15999.111,  100001.744)
Lower Left  (  -15999.111,   89999.244)
Upper Right (       3.389,  100001.744)
Lower Right (       3.389,   89999.244)
Center      (   -7997.861,   95000.494)
Band 1 Block=6401x1 Type=Byte, ColorInterp=Gray

The OUTPUT objects:
IMAGETYPE png32
	
	OUTPUTFORMAT
		NAME gif
		DRIVER "GD/GIF"
		MIMETYPE "image/gif"
		IMAGEMODE PC256
		EXTENSION "gif"
		TRANSPARENT ON
	END
	
	OUTPUTFORMAT
		NAME jpeg
		DRIVER "GD/JPEG"
		MIMETYPE "image/jpeg"
		IMAGEMODE PC256
		EXTENSION "jpg"
		
	END

	OUTPUTFORMAT
		NAME png32
		DRIVER "GDAL/PNG"
		IMAGEMODE RGBA
		TRANSPARENT ON
	END


The layer object:
LAYER
		NAME         vinte_cinco_alta
		METADATA
			"wms_title" "vinte_cinco_alta"
		END 
		STATUS		ON
	        TILEINDEX	'25000_alta.shp'
		TILEITEM 	'location'
		TYPE		RASTER
		
		#PROCESSING "SCALE_1=3,0"
		#PROCESSING "SCALE_2=3,0"
		#PROCESSING "SCALE_3=3,0"
		#PROCESSING "SCALE=AUTO"
		#PROCESSING "COLOR_MATCH_THRESHOLD=1"
		#PROCESSING "BANDS=2
		
		OFFSITE 255 255 255
		
		TRANSPARENCY ALPHA
		
	    PROJECTION
	      "init=epsg:27492"
	    END	
		DEBUG		ON
		
		MINSCALE	10000
		MAXSCALE	26000
		
	END

My prob is that i can´t force mapserver only to render the black color in
the rasters (i tried changing several parameters in the layer object, and
using different output declarations). If it´s possible can u show it to me?

The output format isn´t important, just wanna get fully transparent layers
(in colors grey and white, keeping black).

Thanks in advance!

Cumps, Pedro Mendes
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