This problem killing me during last 2 weeks.
At local Machine with Windows XP (SP3) i use ImageMagick 6.5.1-Q8,
at server Fedora 8 use 6.3.5-Q16.
Problem: after resing JPEG (sRGB) image with Windows machine i got image with the same dimensions, but after server side command - 96 pixels/inch.
Configuration error? ) Version error? My brain error?
Command: convert image.jpg -resize 25% -quality 80 result.jpg
P.S. But another EXIF records was saved...
From Russia with love.