I think these words in documentation give an answer why your tiff images
are uncompressing by fop image loader:
"
TIFF
FOP can embed TIFF images without decompression into PDF, PostScript and
AFP if they have either CCITT T.4, CCITT T.6, or JPEG compression.
Otherwise, a TIFF-capable Image I/O codec is necessary for decoding the
image.
There may be some limitation concerning images in the CMYK color space.
"
So i think, the best way to serve your problem is converting your tiff
images to appropriate format (what documentation tells) before using it
in fop.
Hope this help you.
Have a nice day!
Szeak
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