qpdf: image /IIm1 on page 1: not optimizing because image is smaller than requested minimum dimensions
qpdf: image /IIm2 on page 1: optimizing image reduces size from 2134997 to ...
qpdf: image /IIm3 on page 1: not optimizing because unable to decode data or data already uses DCT
qpdf: wrote file a.pdf
