Digital BW, The Print

Arghh!! I meant:


Better to deliver the printer a tonal range it can handle (45-243).....



> From: Steve Kale <stevekale@...>
> Date: Thu, 02 Dec 2004 16:42:47 +0000
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: Re: [Digital BW] Tonal range and linearization
> 
> Yes what you say is correct.  As set up at the moment, a 255 pixel (or
> normalised pixel value of 1) goes to paper white 0.043 and 0 pixel to 1.65.
> But note that the gamma of such a range is completely different from the
> workspace gamma.  In the workspace gamma we go from density values of 0.043 to
> 1.65 in pixel values of 243 to 45.  This is my point.  As a result, we work in
> a tonal range of 0-255 with a gamma of 2.2 yet print with a device which has a
> tonal range of 45-243 and a gamma of lord knows what....No wonder we don't get
> a WYSIWYG output.  Better to deliver the printer a tonal range it can handle
> (43-293) and have it calibrated to the same gamma as our workspace. No?
> 
> 
>> From: Tyler Boley <tyler@...>
>> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
>> Date: Thu, 02 Dec 2004 16:20:01 -0000
>> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
>> Subject: Re: [Digital BW] Tonal range and linearization
>> 
>> 
>> 
>> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, Steve Kale
>> <stevekale@b...> wrote:
>> 
>> snip...
>> 
>>> For EEM which I will say has a density range of 0.043 to 1.65, this
>> range is
>>> approximately, using the 0-255 scale, pixels from 18 to 243, assuming a
>>> gamma of 2.2.  Anything outside this range can't be reproduced...
>> 
>> 
>> Steve, perhaps you correct yourself later in the post (sorry, out of
>> time) but this is incorrect.
>> The entire path from numbers exiting Photoshop to ink hitting paper
>> does not clip as you suggest.
>> 
>> 255 winds up mapping to your 0.043 paper, and 0 to your 1.65 ink
>> black. All in between is "compressed" accordingly. If you have
>> clipping such as you imply, there are other problems. The nature of
>> the compression is determined by your entire workflow and device
>> characteristics.
>> 
>> Tyler
>> www.custom-digital.com
>>