Converting RGB pdf to CMYK in acrobat 8 professional

Hi Can anyone tell me why when i convert an RGB pdf to CMYK using convert colours in Advanced/Print production the image resolution changes as in you get a haze around the text etc!! it looks like the pdf was created in photoshop or the original image was from photoshop could it have anything to do with jpeg compression?? if so how can i get round this in acrobat i dont want to have to save as postscript and pdf it again in distiller everytime!!
thanks
whitey!!

Hi Jon
Sorry its been so long!!
do you have an email i could send the before/after too??

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