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300 dpi photos changing to 150 dpi in Acrobat.

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Linda Jupiter
300 dpi photos changing to 150 dpi in Acrobat.
on Nov 8, 2013 at 7:10:12 pm

Working in InDesign 5.5: 300 dpi photos are changing to 150 dpi photos when I make my Acrobat files.

Using Highest Quality in Distiller. Under Images for both grayscale and color: Bicubic Downsampling to 300 pixels per inch; for images above: 450 pixels per inch; Image Quality: Maximum and Compression: Automatic (JPEG). Under Monochrome Images the Bicubic Downsample to 1200 pixels per inch and for images above: 1800 pixels per inch; Compression CCITT Group 4; Anti-Alias to gray: Off.

Then I turned off Downsampling and Compression and still nothing's changed.


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Paul Fullilove
Re: 300 dpi photos changing to 150 dpi in Acrobat.
on Nov 8, 2013 at 8:40:01 pm

I ran into this problem awhile ago. It appears that the problem might be Distiller using silently the sub-sampling algorithm instead of bicubic interpolation because your downscale ratio might be between 50.x% and 99.99%. I read the following article: http://kaiser-edv.de/tmp/Downsampling-Verdeutlichung/. I just made sure my images don't fall in the "danger range" that the article refers to.


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Linda Jupiter
Re: 300 dpi photos changing to 150 dpi in Acrobat.
on Nov 8, 2013 at 11:15:56 pm

Thank you; this is helpful.
Cheers,


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Paul Fullilove
Re: 300 dpi photos changing to 150 dpi in Acrobat.
on Nov 9, 2013 at 3:23:41 am

You're welcome.


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