id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	blockedby	blocking
132	imageObj::saveWebImage(): [MapServer Error]: jpeg_ErrorExit(): libjpeg: Backing store not supported	Stefan Schmidhammer	Jeff McKenna	"I have installed MS4W on Windows 7 x64 and always when I try to output a map as JPEG I get the error:

imageObj::saveWebImage(): [Map Server Error]: jpeg_ErrorExit(): libjpeg: Backing store not supported

Only when I set the SIZE in the mapfile to a very small dimension like 
SIZE 10 10
a JPEG gets successfully produced which is around 350KB
Even if I set it to SIZE 15 15 it fails with that error.

Based on some researched it seems this is some memory limit in the JPEG library, however I don't see where I can change this. It should be possible to create bigger pictures than 10x10 by default.

So far I have to create PNG files where this error does not occur.

Header of mapfile:

NAME testmap.map
STATUS ON
IMAGETYPE JPEG
IMAGECOLOR 240 240 240
SHAPEPATH ""shp/""
FONTSET ""fonts/fonts.list""
EXTENT -1200 -900 400 100
SIZE 500 500
UNITS METERS"	defect	closed	major	3.2.3 release	MS4W - PHP	3.2.2	fixed	libjpeg, jpg, jpeg, Backing store, jpeg_ErrorExit