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Densitometer or Spectrophotometer?

Densitometer or Spectrophotometer?

2003-03-31 by Dimitri Katsaros

Hi all,

I was wondering if, forgetting for a moment about any
price differences, a dedicated densitometer is, in
general, any more accurate that using a
spectrophotometer for measuring a 21-step wedge. I
know that there are variances between models and
brands, but I am also wondering if there would be any
advantage in owning both.

Thank you
Dimitri Katsaros

=====
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Re: [Digital BW] Densitometer or Spectrophotometer?

2003-03-31 by Robert Morrison

The problem with many of the prosummer level spectrophotometers is that they
don't have strong enough light sources to measure black patches with low
reflectance (high dmax).  As a result, several of us have found that these
devices are not good for readings above 1.6 or so.  This is a problem for
determining accurate shadows on many matte papers and causes considerable
problems if you plan to work with coatings or print on glossy or RC papers.
As such, buying a used professional densitometer, like the X-rite 810, which
several of us have, makes more sense for measuring step wedges for BW work.

Robert
Show quoted textHide quoted text
On 3/30/03 9:28 PM, "Dimitri Katsaros" <dcka@...> wrote:

> Hi all,
> 
> I was wondering if, forgetting for a moment about any
> price differences, a dedicated densitometer is, in
> general, any more accurate that using a
> spectrophotometer for measuring a 21-step wedge. I
> know that there are variances between models and
> brands, but I am also wondering if there would be any
> advantage in owning both.
> 
> Thank you
> Dimitri Katsaros
> 
> =====
> Quiquid latine dictum sit altum viditur
> 
> __________________________________________________
> Do you Yahoo!?
> Yahoo! Platinum - Watch CBS' NCAA March Madness, live on your desktop!
> http://platinum.yahoo.com
> 
> 
> Please visit the Group Homepage to check the Files, Bookmarks, Polls and other
> resources as they are often being updated. The page is at:
> 
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
> 
> If you wish to receive no emails or just a daily digest, or you wish to
> unsubscribe, please edit your Membership preferences by visiting this same
> page.
> 
> Please follow these basic guidelines:
> - Include your full name with your message.
> - Include the address of your website, if you have one.
> - As threads develop, trim off excess portions of earlier messages to keep
> them short.
> - As the topic of a thread changes remember to change the subject header.
> - Good manners are required at all time. No personal attacks or
> &amp;amp;quot;flames.&amp;amp;quot;
> - Complete your Yahoo profile.
> - Before posting a question, search the message archives and the various
> resources on the homepage.
> 
> 
> 
> 
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
> 
> 
>

Re: [Digital BW] Densitometer or Spectrophotometer?

2003-03-31 by Dimitri Katsaros

Yes, but if you recall, I did specify that you forget about price 
differences. So, the spectrophotometer I had in mind was the 
Spectrolino. Alternatively, the people at X-Rite suggested the 508, 
but the downside with the 508 is that it cannot be used with a 
monitor (to my knowledge) nor can I see a way for it to be fitted to 
a device similar to the spectroscan. OTOH, the 508 is slightly more 
accurate (0-2.0D +/-.005D and 2.0-2.5 +/-.010D).

Dimitri

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Robert Morrison 
<rmorrison@p...> wrote:
> The problem with many of the pro-sumer level spectrophotometers is 
that they
> don't have strong enough light sources to measure black patches 
with low
> reflectance (high dmax).  As a result, several of us have found 
that these
> devices are not good for readings above 1.6 or so.  This is a 
problem for
> determining accurate shadows on many matte papers and causes 
considerable
> problems if you plan to work with coatings or print on glossy or RC 
papers.
> As such, buying a used professional densitometer, like the X-rite 
810, which
> several of us have, makes more sense for measuring step wedges for 
BW work.
> 
> Robert
> 
> 
> On 3/30/03 9:28 PM, "Dimitri Katsaros" <dcka@y...> wrote:
> 
> > Hi all,
> > 
> > I was wondering if, forgetting for a moment about any
> > price differences, a dedicated densitometer is, in
> > general, any more accurate that using a
> > spectrophotometer for measuring a 21-step wedge. I
> > know that there are variances between models and
> > brands, but I am also wondering if there would be any
> > advantage in owning both.
> > 
> > Thank you
> > Dimitri Katsaros
> > 
> > =====
> > Quiquid latine dictum sit altum viditur
> > 
> > __________________________________________________
> > Do you Yahoo!?
> > Yahoo! Platinum - Watch CBS' NCAA March Madness, live on your 
desktop!
> > http://platinum.yahoo.com
> > 
> > 
> > Please visit the Group Homepage to check the Files, Bookmarks, 
Polls and other
> > resources as they are often being updated. The page is at:
> > 
> > http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
> > 
> > If you wish to receive no emails or just a daily digest, or you 
wish to
> > unsubscribe, please edit your Membership preferences by visiting 
this same
> > page.
> > 
> > Please follow these basic guidelines:
> > - Include your full name with your message.
> > - Include the address of your website, if you have one.
> > - As threads develop, trim off excess portions of earlier 
messages to keep
> > them short.
> > - As the topic of a thread changes remember to change the subject 
header.
> > - Good manners are required at all time. No personal attacks or
> > &amp;amp;quot;flames.&amp;amp;quot;
> > - Complete your Yahoo profile.
> > - Before posting a question, search the message archives and the 
various
> > resources on the homepage.
> > 
> > 
> > 
> > 
> > Your use of Yahoo! Groups is subject to 
http://docs.yahoo.com/info/terms/
Show quoted textHide quoted text
> > 
> > 
> >

Re: [Digital BW] Densitometer or Spectrophotometer?

2003-04-02 by Robert Morrison

Sorry about that...if price is no option it shouldn't be a problem to use a
high-end spectrophotometer to measure 21 step wedges.  The specs of the unit
that you give below seem to be completely adequate.  My main concern was for
people on a budget...where the used densitometers seem to give much better
performance than the lower-end new spectrophotometers.

Robert
Show quoted textHide quoted text
On 3/31/03 11:19 AM, "Dimitri Katsaros" <dcka@...> wrote:

> Yes, but if you recall, I did specify that you forget about price
> differences. So, the spectrophotometer I had in mind was the
> Spectrolino. Alternatively, the people at X-Rite suggested the 508,
> but the downside with the 508 is that it cannot be used with a
> monitor (to my knowledge) nor can I see a way for it to be fitted to
> a device similar to the spectroscan. OTOH, the 508 is slightly more
> accurate (0-2.0D +/-.005D and 2.0-2.5 +/-.010D).
> 
> Dimitri
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, Robert Morrison
> <rmorrison@p...> wrote:
>> The problem with many of the pro-sumer level spectrophotometers is
> that they
>> don't have strong enough light sources to measure black patches
> with low
>> reflectance (high dmax).  As a result, several of us have found
> that these
>> devices are not good for readings above 1.6 or so.  This is a
> problem for
>> determining accurate shadows on many matte papers and causes
> considerable
>> problems if you plan to work with coatings or print on glossy or RC
> papers.
>> As such, buying a used professional densitometer, like the X-rite
> 810, which
>> several of us have, makes more sense for measuring step wedges for
> BW work.
>> 
>> Robert
>> 
>> 
>> On 3/30/03 9:28 PM, "Dimitri Katsaros" <dcka@y...> wrote:
>> 
>>> Hi all,
>>> 
>>> I was wondering if, forgetting for a moment about any
>>> price differences, a dedicated densitometer is, in
>>> general, any more accurate that using a
>>> spectrophotometer for measuring a 21-step wedge. I
>>> know that there are variances between models and
>>> brands, but I am also wondering if there would be any
>>> advantage in owning both.
>>> 
>>> Thank you
>>> Dimitri Katsaros
>>> 
>>> =====
>>> Quiquid latine dictum sit altum viditur
>>> 
>>> __________________________________________________
>>> Do you Yahoo!?
>>> Yahoo! Platinum - Watch CBS' NCAA March Madness, live on your
> desktop!
>>> http://platinum.yahoo.com
>>> 
>>> 
>>> Please visit the Group Homepage to check the Files, Bookmarks,
> Polls and other
>>> resources as they are often being updated. The page is at:
>>> 
>>> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
>>> 
>>> If you wish to receive no emails or just a daily digest, or you
> wish to
>>> unsubscribe, please edit your Membership preferences by visiting
> this same
>>> page.
>>> 
>>> Please follow these basic guidelines:
>>> - Include your full name with your message.
>>> - Include the address of your website, if you have one.
>>> - As threads develop, trim off excess portions of earlier
> messages to keep
>>> them short.
>>> - As the topic of a thread changes remember to change the subject
> header.
>>> - Good manners are required at all time. No personal attacks or
>>> &amp;amp;quot;flames.&amp;amp;quot;
>>> - Complete your Yahoo profile.
>>> - Before posting a question, search the message archives and the
> various
>>> resources on the homepage.
>>> 
>>> 
>>> 
>>> 
>>> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>>> 
>>> 
>>> 
> 
> 
> 
> Please visit the Group Homepage to check the Files, Bookmarks, Polls and other
> resources as they are often being updated. The page is at:
> 
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
> 
> If you wish to receive no emails or just a daily digest, or you wish to
> unsubscribe, please edit your Membership preferences by visiting this same
> page.
> 
> Please follow these basic guidelines:
> - Include your full name with your message.
> - Include the address of your website, if you have one.
> - As threads develop, trim off excess portions of earlier messages to keep
> them short.
> - As the topic of a thread changes remember to change the subject header.
> - Good manners are required at all time. No personal attacks or
> &amp;amp;quot;flames.&amp;amp;quot;
> - Complete your Yahoo profile.
> - Before posting a question, search the message archives and the various
> resources on the homepage.
> 
> 
> 
> 
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
> 
> 
>

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