Digital BW, The Print

Yes if all you did was do a PS curve compressing the image tonal range to
45-243 then you would end up with an even flatter image.  This is because
you have compressed the image tonal range and done nothing with the printer
gamma.  But if instead I set up the printer such that a pixel value of 45 is
delivered a full ink load, a pixel value of 243 is given paper white, and
the points in between have the same gamma as the workspace then you will get
WYSISYG. In this case, I have equated the two environments (manually because
I don't have colorsync - we are using Same as Source, a non-colour managed
workflow).

The "WYSIWY don't G" problem is because the printer gamma (that which
defines the rate of change of density produced from pixel value 0 to value
255) is completely different from that of the workspace. The printer goes
from 0.043 (@ 255) to 1.65 (@ 0).  The display (and underlying image values)
goes from 0 (the calibrated white point, D50) to a maximum black way beyond
1.65 in the same 8bit 0-255 range.

(You might then ask what would the printer do upon receiving pixel values
less than 45 and greater than 243?  If you have done the PS curve correctly
the printer won't get any but I would pad the two ends with max ink load and
paper white, respectively.)


> From: Tyler Boley <tyler@...>

> 
> No, that will result in even further compression. 243 will map to a
> light gray instead of paper white, 45 will map to less than ink black,
> lowering your potential final density range.
> 
> Tyler
> www.custom-digital.com
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