They're raw greyscale pixel values. I was able to convert one with imagemagick: ...

		LeoPanthera on June 15, 2018 \| parent \| context \| favorite \| on: Earliest images of the moon were better than peopl... They're raw greyscale pixel values. I was able to convert one with imagemagick: convert -size 19992x16500 -depth 16 gray:FRAME_1005_H1.IMG out.png The dimensions are specified in the .LBL files in the same directory, right at the end of the file.

Alternatively, NASA help links to IMG2PNG for windows: http://bjj.mmedia.is/utils/img2png/