Odd greyscale behavior when drop-shadow is applied.


i have file 4 images in it. 1 rgb , 3 greyscale jpeg images. fine.

 

now, when put drop-shadow effect on images, rgb image looks expected; but, greyscale images lighter before.

 

i exported pdf of 2 pages (i made duplicate 1 page has shadow , 1 not) pdf-x/1a profile. of greyscale images lighter, page without shadow, looks darker in indesign. rgb image looks same on both pages in pdf.

 

why greyscale images lighter when drop-shadow applied? or, maybe better question is, why image without drop shadow darker? (the darker image looks more natural. opened greyscale images in both apple's preview , in photoshop. preview displays nicer-looking darker image, photoshop shows images being lighter, way looks in exported pdf.

 

any ideas?

indesign doesn't have grayscale working space. instead puts grayscale data onto black plate unaltered , displays using current cmyk working profile. accurate idea of how file should turn on overprint preview.  trust photoshop , acrobat lot more preview.



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