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Digital BW, The Print

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error in 21-step wedge ?

error in 21-step wedge ?

2003-02-19 by johngeyles <jge@cs.unc.edu>

I recently downloaded a 21-step wedge from some pointer is this
group.  The file was called '21stepNew.jpg'.

I think there's a slight error, of scaling, in the file.  In
Photoshop Image Size, the size is listed as 3 x 9.6", at
300 pixels/inch.

But the 7.2 lp/mm resolution target has 2 pixels per line pair.
This means the resolution SHOULD be 144 pixels/cm to make the
resolution target be printed at correct scale.  Which is somewhat
different than 300 pixels/inch.  This scaling error applies
to the other resolution patterns as well.

Of course, the simple fix is to change the rez to 144 pixels/cm,
(without resampling, of course).  The size then becomes about
2.4 x 7.9".

John

RE: [Digital BW] error in 21-step wedge ?

2003-02-19 by Paul Roark

The 21-step file with the resolution test is supposed to be 360 dpi.  At 300
dpi it will not give the indicated resolutions.  (I thought this file had
been changed.  I'll forward the correct file.)

Paul
http://www.PaulRoark.com


___________________________________
Show quoted textHide quoted text
  -----Original Message-----
  From: johngeyles <jge@...> [mailto:jge@...]
  Sent: Wednesday, February 19, 2003 11:59 AM
  To: DigitalBlackandWhiteThePrint@yahoogroups.com
  Subject: [Digital BW] error in 21-step wedge ?


  I recently downloaded a 21-step wedge from some pointer is this
  group.  The file was called '21stepNew.jpg'.

  I think there's a slight error, of scaling, in the file.  In
  Photoshop Image Size, the size is listed as 3 x 9.6", at
  300 pixels/inch.

  But the 7.2 lp/mm resolution target has 2 pixels per line pair.
  This means the resolution SHOULD be 144 pixels/cm to make the
  resolution target be printed at correct scale.  Which is somewhat
  different than 300 pixels/inch.  This scaling error applies
  to the other resolution patterns as well.

  Of course, the simple fix is to change the rez to 144 pixels/cm,
  (without resampling, of course).  The size then becomes about
  2.4 x 7.9".

  John



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[Non-text portions of this message have been removed]

RE: error in 21-step wedge ?

2003-02-20 by adounoucos@aol.com

Paul,

I just checked my version of the step wedge, and it too shows 300.   Are you 
going to mount a new version on your site?

Please add my thanks to your basket full of appreciation you already have for 
the help you give us all.

Angelo 


[Non-text portions of this message have been removed]

RE: [Digital BW] RE: error in 21-step wedge ?

2003-02-20 by Paul Roark

Martin has put a corrected 360 dpi version of the 21-step test strip in the
Files section of the forum.

Paul
http://www.PaulRoark.com

________________________________________
Show quoted textHide quoted text
  -----Original Message-----
  From: adounoucos@... [mailto:adounoucos@...]
  Sent: Thursday, February 20, 2003 7:42 AM
  To: DigitalBlackandWhiteThePrint@yahoogroups.com
  Subject: [Digital BW] RE: error in 21-step wedge ?


  Paul,

  I just checked my version of the step wedge, and it too shows 300.   Are
you
  going to mount a new version on your site?

  Please add my thanks to your basket full of appreciation you already have
for
  the help you give us all.

  Angelo


  [Non-text portions of this message have been removed]


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  Please visit the Group Homepage to check the Files, Bookmarks, Polls and
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  http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint

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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;amp;quot;flames.&amp;amp;amp;quot;
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