ISOCAM image of Trifid Nebula taken at 11.5 microns.
An optical image of the above source is
available here.
(Click here for full size version of the
above
and here for combined optical and ISO
version.)
This image is dicussed in the item "An Infrared "Negative" of a Bright Nebula" that appeared in the ESA/ISO Info Note 25.97. Other images from this note can be viewed here