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Why does CG "smarten" quotes in PDF?

Subject: Why does CG "smarten" quotes in PDF?
From: Rob Raguet-Schofield <email@hidden>
Date: Wed, 29 Jun 2005 11:00:35 -0500
Delivered-to: email@hidden
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If my application generates PDF containing a single quote character:

BT
1 0 0 -1 101 204 Tm
/F1 153 Tf
(') Tj
ET

where F1 is the built in Times font:

<< /Type /Font /Subtype /Type1 /Name /F1 /BaseFont /Times-Roman >>

Preview (as well as Adobe Acrobat) display this single quote as a smart/culy single quote. If I select and copy this text from Preview I get unicode character 0x2019 (RIGHT SINGLE QUOTATION MARK), when the character that was intented to be displayed was unicode 0x0027 (APOSTROPHE).

Why does Preview (i.e. CoreGraphics PDF renderer) change the character that's being displayed from a regular single quote to a smart single quote?

Rob Raguet-Schofield
(rob ra gA skO fEld)

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