The format is in the "enc" column of the list output. Form the man page:
enc encoding:
image - raster image (may be Flate or LZW
compressed but does not use an image encod‐
ing)
jpeg - Joint Photographic Experts Group
jp2 - JPEG2000
jbig2 - Joint Bi-Level Image Experts Group
ccitt - CCITT Group 3 or Group 4 Fax
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