[MS4W-Users] IMPORTANT: JPEG Output broken in MS4W 6.0 betas (patch ready)

[Jeff McKenna]

Jukka on the MapServer-users mailing list point out recently 
(http://osgeo-org.1803224.n2.nabble.com/MS-6-0-beta4-is-image-jpeg-output-OK-td6265200.html) 
that any 6.0 mapfile that tries to output a jpeg image ('image/jpeg') 
creates an invalid empty image with MS4W.

Short version:
Please everyone test this patch for jpeg and your preferred output 
formats and provide feedback 
(http://www.maptools.org/dl/ms4w/mapserver_ms4w-6.0.0-beta6-patch.zip)

Long version:
Through the ticket (http://bugzilla.maptools.org/show_bug.cgi?id=2313) 
and on IRC chat we narrowed it down to the GD library: in fact GD was 
pointing to a non-existent JPEG version, 6b, but MapServer was built 
against a newer JPEG version, 8b, and JPEG wasn't happy about this.  So 
a patch is now available that upgrades your JPEG library to 8c and 
contains a rebuilt GD version, pointing to that new JPEG version. 
Please test it with jpeg output (in any mapfile, specify 'IMAGETYPE 
image/jpeg' and then test with 'shp2img -o test.jpg').  While you're at 
it, give it a test in your other favourite output formats as well.

I apologize for any inconvenience.  I guess it is a good thing this was 
discovered in the 6.0 beta phase, before a full MS4W version was released.

Again thanks to Jukka for reporting this!

-jeff




-- 
Jeff McKenna
MapServer Consulting and Training Services
http://www.gatewaygeomatics.com/