Keep quality when saving pdf

i using photoshop cs6: tried on cs5 going through same process below little bit higher quality not original quality.

 

i open pdf, pops "import pdf" hit ok. edit pdf using marquee tool select area in pdf want delete. delete once area selected. save pdf using "save as...". set format pdf, hit "save". pops "save adobe pdf" hit "save pdf".

 

when print off original version of pdf compared edited 1 quality bit off. fills more space on paper also. first 1 darker , overall crisper. there missed when saving pdf keep same quality before edited it?

 

i'm thinking may able change quality in pop messages got don't want mess else up.

until figure out, save .psd of edited .pdf.

 

you need match colorspace , color profile of both pdfs. open oriignal pdf in acorabt, and  view >> tools print production >> output preview. @ bottom see tranparency blending space, .pdf below rgb.

 

 

on size issue need see print settings both doucuments, may have 1 set resize paper , other actual size.

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