Conver to Greyscale

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hi all,

 

i've found peculiar problem greyscale conversion in photoshop cs5.

 

the problem:

 

i have black , white photos in rgb colourspace. can't use black , white layer adjustment because there no colour channels in image. used 'image > mode> greyscale' menu item convert greyscale, , in photoshop there appears no change greyscale values. however, when place image in indesign, markedly different; blacks pure black greys washed out. print 2 images side side (rgb , greyscale) , come out identical (though darker expected). indesign showing rgb or greyscale differently on screen? have display settings @ 'high quality'.

 

i hope makes sense. it's doing head in little.

 

thanks!

 

eu.

do know grayscale profile converting to

 

why not photoshop edit> convert profile: specific gray profile

 

i recall gray color spaces not exist in indesign (don't trust indesign's preview because can't display gray images accurately), trust photoshop preview, when export indesign document pdf, embed profiles , acrobat display , print gray images properly

 

why need gray images vs rgb



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