Digital BW, The Print

Hi,

I'm currently evaluating ImagePrint, and really like some aspects of
it. However I've seen some work done with IJC/OPM which really blew me
away. I would like to give IJC/OPM a try but it seems like that would
be even more expensive than IP given that I'd need to get a
spectrophotometer or a densitometer. So far I've only found that these
devices are very expensive. 

Are there any options for taking the measurements for IJC/OPM that
aren't so expensive? And no I can't use my eyes for doing this job.

Thanks, Derek

It's possible to use a flatbed scanner with good results - 
densitometers are quite cheap on EBay as well.

Derek,

IJC/OPM is able to use a scanner for linearization, but it won't be 
as accurate as a densitometer or spectrophotometer.  All you do is 
scan the printed test target, save it, open it into IJC, and drag 
your mouse pointer across the target.  L* values are read directly 
into the program for linearization.  

Lou

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "dealy663" 
<dealy663@h...> wrote:
> 
> Hi,
> 
> I'm currently evaluating ImagePrint, and really like some aspects of
> it. However I've seen some work done with IJC/OPM which really blew 
me
> away. I would like to give IJC/OPM a try but it seems like that 
would
> be even more expensive than IP given that I'd need to get a
> spectrophotometer or a densitometer. So far I've only found that 
these

> devices are very expensive. 
> 
> Are there any options for taking the measurements for IJC/OPM that
> aren't so expensive? And no I can't use my eyes for doing this job.
> 
> Thanks, Derek

How does one scan the linearization file? I've already printed it
out, and I assume I"d want  as straight a scan as possible, set black
point as #26, white 
point to #1 or the white of the  paper, with no auto anything that
could affect the contrast 
curve, then save as tiff.


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "ldina"
<lbdina@c...> wrote:

> 
> Derek,
> 
> IJC/OPM is able to use a scanner for linearization, but it won't be 
> as accurate as a densitometer or spectrophotometer.  All you do is 
> scan the printed test target, save it, open it into IJC, and drag 
> your mouse pointer across the target.  L* values are read directly 
> into the program for linearization.  
> 
> Lou
>

I only played with the scanning import just to try it out, since I 
use an Eye One for linearization.  You should probably check with 
Bowhaus to be certain, but this is what I would probably do:

1.  Scan the printed target RAW ~ no corrections, no conversion, no 
black or white point clipping, etc.  I would want to see exactly what 
the scanner sees without any compensation.  For linearization, all 
you really want is brightness levels anyway.  I guess you could scan 
in grayscale mode if your scanner supports it.

2.  Bring it into Photoshop RAW.  Again, I wouldn't assign or convert 
or alter the data in any way.  You want to retain the luminance 
levels as read.  I'd just straighten it out so it is horizontal, 
clean up an blemishes or specks with the clone tool, if required, 
being sure not to change the tonal value of the patches.

3.  Save as a TIF file.

4.  Open IJC and import from scanner on the linearization tab.  Swipe 
the mouse over the data from left to right and the data should fill 
in automatically.  

I'm not sure if this is exactly what Bowhaus would recommend, but it 
makes sense to me.  You would not want to alter the tonal value in 
any way, otherwise I would expect your white point, black point and 
linearization to be inaccurate.  

Lou

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "lambonick" 
<BMWNick@i...> wrote:
> 
> 
> How does one scan the linearization file? I've already printed it
> out, and I assume I"d want  as straight a scan as possible, set 
black
> point as #26, white 
> point to #1 or the white of the  paper, with no auto anything that
> could affect the contrast 
> curve, then save as tiff.
> 
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "ldina"
> <lbdina@c...> wrote:
> > 
> > Derek,
> > 
> > IJC/OPM is able to use a scanner for linearization, but it won't 
be 
> > as accurate as a densitometer or spectrophotometer.  All you do 
is 
> > scan the printed test target, save it, open it into IJC, and drag 
> > your mouse pointer across the target.  L* values are read 
directly 

> > into the program for linearization.  
> > 
> > Lou
> >

Lou,

You have it right.  The idea is to scan as linear ( raw) as you can.  You
don¹t want to make any changes on scanner or Photoshop.  It¹s also important
that you don¹t clip out either the paper white or step 26 ( D-Max).

Once you have your scan ready, use the ³import scanned target² function to
open the scan into a preview window.  At that point you can drag a mouse
selection around the 26 steps. Once you release your selection. IJC will
display a numeric preview of the sampled values.  You can use the numeric
preview to verify that you have properly selected the steps.

Also note that you want to set the aim midpoint slider to (0) this will set
the Aims to be linear.

Joe Berndt



 imported into IJC, IJC will extract the pixels values from the file.

On 1/25/05 2:30 PM, "ldina" <lbdina@...> wrote:

> 
> I only played with the scanning import just to try it out, since I
> use an Eye One for linearization.  You should probably check with
> Bowhaus to be certain, but this is what I would probably do:
> 
> 1.  Scan the printed target RAW ~ no corrections, no conversion, no
> black or white point clipping, etc.  I would want to see exactly what
> the scanner sees without any compensation.  For linearization, all
> you really want is brightness levels anyway.  I guess you could scan
> in grayscale mode if your scanner supports it.
> 
> 2.  Bring it into Photoshop RAW.  Again, I wouldn't assign or convert
> or alter the data in any way.  You want to retain the luminance
> levels as read.  I'd just straighten it out so it is horizontal,
> clean up an blemishes or specks with the clone tool, if required,
> being sure not to change the tonal value of the patches.
> 
> 3.  Save as a TIF file.
> 
> 4.  Open IJC and import from scanner on the linearization tab.  Swipe
> the mouse over the data from left to right and the data should fill
> in automatically.
> 
> I'm not sure if this is exactly what Bowhaus would recommend, but it
> makes sense to me.  You would not want to alter the tonal value in
> any way, otherwise I would expect your white point, black point and
> linearization to be inaccurate.
> 
> Lou
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "lambonick"
> <BMWNick@i...> wrote:
>> > 
>> > 
>> > How does one scan the linearization file? I've already printed it
>> > out, and I assume I"d want  as straight a scan as possible, set
> black
>> > point as #26, white
>> > point to #1 or the white of the  paper, with no auto anything that
>> > could affect the contrast
>> > curve, then save as tiff.
>> > 
>> > 
>> > --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "ldina"
>> > <lbdina@c...> wrote:
>>> > > 
>>> > > Derek,
>>> > > 
>>> > > IJC/OPM is able to use a scanner for linearization, but it won't
> be 
>>> > > as accurate as a densitometer or spectrophotometer.  All you do
> is 
>>> > > scan the printed test target, save it, open it into IJC, and drag
>>> > > your mouse pointer across the target.  L* values are read
> directly 
>>> > > into the program for linearization.
>>> > > 
>>> > > Lou
>>> > >
> 
> 



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