On our copiers, we have the option of scanning to Compact PDF. All it does is 
use the highest compression for the embedded JPEG images. The copier will not 
allow the selection of Compact PDF if the color depth is set to grayscale or 
black and white. Hence, I believe you are correct in your assessment. Grayscale 
is essentially a 256 color (8 bit) image which uses only black as a color.

Bob S

On Feb 7, 2017, at 21:35 , Scott Rossi via use-livecode 
<use-livecode@lists.runrev.com<mailto:use-livecode@lists.runrev.com>> wrote:

You say the mode is 8 bit.  I might be wrong, but I don’t believe JPEG supports 
8 bit (256 color) images.  Even if it does technically, the format is not 
really intended for 8 bit images, but rather 16 bit or higher.

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