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<TITLE>sane-devel: Re: "Standard" or "best" image</TITLE>
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<META NAME="Author" CONTENT="John Witford (jwitford@hutch.com.au)">
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<META NAME="Subject" CONTENT="Re: "Standard" or "best" image format?">
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<H1>Re: "Standard" or "best" image format?</H1>
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<!-- received="Sat May 13 04:06:55 2000" -->
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<!-- subject="Re: "Standard" or "best" image format?" -->
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<STRONG>From:</STRONG> John Witford (<A HREF="mailto:jwitford@hutch.com.au?Subject=Re:%20"Standard"%20or%20"best"%20image%20format?&In-Reply-To=<200005131109.VAA11435@pcg.zacglen.com.au>"><EM>jwitford@hutch.com.au</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sat May 13 2000 - 04:09:44 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0089.html">Steve Underwood: "Re: "Standard" or "best" image format?"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0087.html">Nick Lamb: "Re: "Standard" or "best" image format?"</A>
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<LI><STRONG>Maybe in reply to:</STRONG> <A HREF="0084.html">Bill Wohler: ""Standard" or "best" image format?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0091.html">pixel fairy: "Re: "Standard" or "best" image format?"</A>
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<HR NOSHADE><P>
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<P>
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<EM>>
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</EM><BR>
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<EM>>BTW Most TIFF output suffers the same IP problem as GIF, ie it uses
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</EM><BR>
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<EM>>the patented LZW compression method. Future versions of Gimp and XSane
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</EM><BR>
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<EM>>may not be able to write such TIFFs, though they will still read them.
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</EM><BR>
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<EM>>
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</EM><BR>
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<P>TIFF supports quite a number of different compression schemes, but
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<BR>
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support for them is often fairly limited. Normally these schemes are
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<BR>
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implemented by a libtiff.so share library, so Gimp and XSane really
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<BR>
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need not concern themselves with whether the library supports LZW
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<BR>
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or not. Some people actually do have a license to use LZW compression
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<BR>
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so applications should leave it open. An application can make all
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<BR>
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the known compressions available as options, and if the library does not
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<BR>
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support a particular compression then it will fall back to none.
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<BR>
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No compile/link-time decision is necessary.
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<BR>
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<P>Also, TIFF has a few features that are essential for any serious graphics work,
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<BR>
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for example, the ability to record the original resolution, and an
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<BR>
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ICC profile tag. Loss of information is never a good idea, and
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<BR>
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the lowest common denominator is not always the best. Although the PNM
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<BR>
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utilities are handy, it is necessary to save TIFF tags (I use tiffget)
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<BR>
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and reinsert some of them after manipulation (via a modified pnmtotiff).
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<BR>
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<P>Then again, TIFF does have way too many tags.
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<BR>
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<P>-John Witford
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<BR>
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<P><P><PRE>
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--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20"Standard"%20or%20"best"%20image%20format?&In-Reply-To=<200005131109.VAA11435@pcg.zacglen.com.au>">majordomo@mostang.com</A>
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</PRE>
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<HR NOSHADE>
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<UL>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0089.html">Steve Underwood: "Re: "Standard" or "best" image format?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0087.html">Nick Lamb: "Re: "Standard" or "best" image format?"</A>
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<LI><STRONG>Maybe in reply to:</STRONG> <A HREF="0084.html">Bill Wohler: ""Standard" or "best" image format?"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0091.html">pixel fairy: "Re: "Standard" or "best" image format?"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sat May 13 2000 - 04:09:38 PDT</EM>
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