1-bit tiff rendering

[Kristjan Annus]

The best quality can be produced when you draw the raster map with
Mapserver
in there original resolution and then resample it with the help of some
third party
graphical files conversion software.

Kristjan

>Pierre -
>
>MapServer optimizes for fast image rendering, which means quick
>subsampling of pixels from an image.  This is a very fast way to produce
>the output map, but does not produce the best image.  Using gdaladdo or
>a similar mechanism to create different source resolutions is a very
>good idea, because it gives you the ability to produce higher-quality
>intermediate resolutions.  They will still be subsampled if necessary,
>but they will be closer to the "original" and look better.  In some
>cases you can control the rendering scales so the only output
>resolutions permitted are those that are identical to ones you have
>overviews for.
>
>        - 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: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
>Behalf Of GIRAUD Pierre
>Sent: Tuesday, September 14, 2004 11:56 AM
>To: MAPSERVER-USERS at LISTS.UMN.EDU
>Subject: [UMN_MAPSERVER-USERS] 1-bit tiff rendering
>
>  Hi list,
>
>I do have B&W tif's (1-bit coded), and when I want to get those rendered
>by mapserver, I obtain bad restitution within some zoomscales. The map
>image is also B&W. I would prefer it to be in greyscale.
>Can I easily do this with mapserver.
>
>To have this working, I transformed my tiff manually with photoshop to
>have an 8-bit greyscale image. Can I do this easily with the libtiff
>tools ?
>And then I applied gdaladdo to get overviews. This last operation seems
>to be necessary to have a good rendering.
>
>Did some of you have similar problems and got it work ?
>
>Pierre GIRAUD
>
>