Hi List,
i have some raster tiles in TIFF format.
gdalinfo tells me the following:
------- begin -- gdalinfo -----
Driver: GTiff/GeoTIFF
Size is 13000, 13000
Coordinate System is `'
Origin = (4526459.127166650258005,5316969.772833350114524)
Pixel Size = (0.211666700000000,-0.211666700000000)
Metadata:
TIFFTAG_DOCUMENTNAME=Standard Input
TIFFTAG_IMAGEDESCRIPTION=converted PNM file
TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
Image Structure Metadata:
COMPRESSION=CCITTFAX4
Corner Coordinates:
Upper Left ( 4526459.127, 5316969.773)
Lower Left ( 4526459.127, 5314218.106)
Upper Right ( 4529210.794, 5316969.773)
Lower Right ( 4529210.794, 5314218.106)
Center ( 4527834.961, 5315593.939)
Band 1 Block=13000x1 Type=Byte, ColorInterp=Palette
Metadata:
NBITS=1
Color Table (RGB with 2 entries)
0: 255,255,255,255
1: 0,0,0,255
---- end -- gdainfo -----
I have defined following outputformat in th mapfile:
OUTPUTFORMAT
NAME HLTIFF
DRIVER "GDAL/GTiff"
EXTENSION "tif"
MIMETYPE "image/tif"
IMAGEMODE PC256
FORMATOPTION "QUANTIZE_FORCE=ON"
FORMATOPTION "QUANTIZE_DITHER=OFF"
FORMATOPTION "QUANTIZE_COLORS=2"
FORMATOPTION "COMPRESS=GROUP4"
END
When I create a tileindex for mapserver then the response tile has a
color table
with many colors entries, but only two colors are needed.
So the file is bigger than necessary.
Maybe I need some kind of "IMAGEMODE PC2" but this is not possible.
How can i force mapserver to generate two-colored tiles?
It is not important what format the genereted tile is
(PNG or JPEG would be nice, but TIFF is also ok).
Best Regards,
Manfred Zerndl
