Dark outline of pixels around images in PDF


when saving pdf illustrator,  close cropped psd images have dark edge of pixels in final pdf. looks black outline when viewed in acrobat. have since found if flatten transparency before saving pdf , displays fine. why pdf having problems illustrator’s use of transparency?

to version of pdf saving ai file? sounds it's 1.3 or using pdfx-1a flattened file. if save 1.4 or above should handle transparency ok.



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