Image quality problem, please help

hi, i'm new indesign (i'm using cs4). when open new file , create new document, use file > place command place images want them , set display performance 'high quality display' , moment , save , close out file. when open @ later time, quality has reverted low-quality, grainy, pixelated , doesn't seem want save. i'm worried when send off printer crappy, how can permanently set high-quality , stay way?

 

secondly, since i'm new this, wasn't aware have embed file send printer (otherwise stays link , visible on computer using) correct in assuming once i've embedded file document become part of document sent printer see?

 

any appreciated, thanks!

first, set preferences display performance high quality display default , won't have switch each time. nothing open. set global default.

 

when sending file printer have 2 options: first, package (file > package...) gather file , required links , fonts (that aren't restricted) single folder can give printer. secon, , better, export pdf printer's specifications , give them single file has embedded. don't need embed images yourself.

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