Try adding -depth 8 after your rotate before the output image (or
whatever depth you want).
When I use "-rotate" to rotate a 8-bit PNG, the result is 16-bit. Is
there a way to preserve bit-depth?
# before rotation
robr at cartman[13:11:25][/tmp/cdmp/tmp/] file
PO09__1957_DEC_IONOGRAM_0010.png
PO09__1957_DEC_IONOGRAM_0010.png: PNG image data, 4720 x 2368, 8-bit
grayscale, non-interlaced
# rotate
robr at cartman[13:11:31][/tmp/cdmp/tmp/] convert -rotate 180
PO09__1957_DEC_IONOGRAM_0010.png PO09__1957_DEC_IONOGRAM_0010.png
# after rotation
robr at cartman[13:11:49][/tmp/cdmp/tmp/] file
PO09__1957_DEC_IONOGRAM_0010.png
PO09__1957_DEC_IONOGRAM_0010.png: PNG image data, 4720 x 2368, 16-bit
grayscale, non-interlaced
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