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

Jeff McKenna jmckenna at gatewaygeomatics.com
Fri Apr 15 14:11:04 EST 2011

Jukka on the MapServer-users mailing list pointed out recently
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

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 McKenna
MapServer Consulting and Training Services

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