Infrared images of PNe from 8.0 μm to 500 μm for three representative sources. Shown are PNG001.1+00.8, PNG322.4 − 00.1, and PNG308.1 − 00.5 from top to bottom. All images are 5′ on a side. PNG001.1+00.8 and PNG322.4 − 00.1 are rather bright sources and are detected at all wavelengths, while PNG308.1 − 00.5 is rather faint and is not detected at wavelengths longer than 160 μm. The increasing confusion with wavelength is evident.
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