i've printed lots of pictures on fabric-but sorry -- have no idea what PPI or DPI are---
I use good quality (expensive) permenent ink in my ink-jet HP printer- I prepare my fabric for dyeing- (pre-washed with detergent- no fabric softener- or any additives- then iron freezer paper to the back of the fabric- cut to the size of printer paper being very careful to secure the edges so the fabric does not separate in the printer-
i print my pictures- set them aside to 'cure' for up to 24 hours-so the ink has time to saturate the fibers- then i heat set
the next day i run cold water through the pictures to remove the excess ink- dry them & heat-set again...
there are also pre-made printer fabric sheets available- there are a number of different ones- each has its own instructions-some are washable some are not- it's important to follow the instructions on the package to have the best results.