Fwd: IJL v1.5

[Robert Olson]

To get this in the archives. This affects folks using the latest vic for 
windows 2k build for jpeg display.

--bob


>Date: THU, 16 NOV 2000
>From: The IntelX JPEG Library Team <pto at mailbox.intel.com>
>X-Subject: M_015344
>Subject: IJL v1.5
>To: Intel Customers <intel at mailbox.intel.com>
>
>****************************************************************
>You are receiving this email because you have registered and downloaded 
>the Intel® JPEG Library. Additional contact information is at the end of 
>this email.
>****************************************************************
>
>Dear Developer:
>
>We have discovered a couple of issues in IJL v1.5 and are notifying you of 
>them.  There is one bug and one performance issue.  Below is a discussion 
>of the performance issue and a workaround for the bug.
>
>CPU Detection and Selection
>
>The CPU-type auto-detection code in IJL v1.5 does not work properly.  As a 
>result, IJL defaults to blended code for all processors.  This means 
>slower performance on some machines.
>
>In order to workaround this problem, you must add a key to the Windows 
>Registry that specifies witch processor's code to use.
>
>Create the key USECPU key in HKEY_LOCAL_MACHINE\Software\Intel 
>Corporation\PLSuite\IJLib.  The value is a DWORD and should be one of the 
>following values:
>
>0 - Blended code (option for all non-Intel processors)
>3 - Code optimized for Pentium® processor with MMX™ Technology
>4 - Code optimized for Pentium II processor
>5 - Code optimized for Pentium III processor
>6 - Code optimized for Pentium 4 processor
>
>We are working on a patch to IJL that fixes this issue, but in the 
>meantime this key must be used in order to use the highest performance code.
>
>Apparent Performance Decrease
>
>Additionally, starting with IJL v1.5, we are being more rigorous with our 
>internal checks of data in order to provide better image quality. On a 
>given processor, for the same image, IJL v1.5 will be 2 - 3% slower than 
>when using the previous version, IJL v1.1.
>
>We apologize for these inconveniences,
>
>The Intel JPEG Library Team.
>
>If you don’t wish to receive future mailings, please send a note to 
>developer_support at intel.com stating that you wish to unsubscribe, include 
>your email and cite which library list you wish to be removed from (in 
>this case, IJL).  Please do not reply to this message.
>
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