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<TITLE>sane-devel: Re: "Standard" or "best" image</TITLE>
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<META NAME="Author" CONTENT="Steve Underwood (steveu@coppice.org)">
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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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<STRONG>From:</STRONG> Steve Underwood (<A HREF="mailto:steveu@coppice.org?Subject=Re:%20"Standard"%20or%20"best"%20image%20format?&In-Reply-To=<391D472B.FF2FDDAE@coppice.org>"><EM>steveu@coppice.org</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sat May 13 2000 - 05:14:35 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0090.html">Stephen Williams: "Re: "Standard" or "best" image format?"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0088.html">John Witford: "Re: "Standard" or "best" image format?"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0086.html">pixel fairy: "Re: "Standard" or "best" image format?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0088.html">John Witford: "Re: "Standard" or "best" image format?"</A>
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<P>
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pixel fairy wrote:
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<BR>
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<P><EM>> > the format to be
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</EM><BR>
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<EM>> > portable so that it can be used by all software.
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</EM><BR>
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<EM>> > Are there other
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</EM><BR>
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<EM>> > considerations that I have neglected?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> tiff can save arbritary information in "tags" which
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</EM><BR>
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<EM>> sometimes other programs cant read, for example a tiff
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</EM><BR>
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<EM>> saved in photoshop has a pair that gimp cant read. but
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</EM><BR>
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<EM>> this can save information like an ICC profile or gamma
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</EM><BR>
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<EM>> information. png is probably the smallest portable
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</EM><BR>
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<EM>> format, but the only thing it saves besides pixel data
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</EM><BR>
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<EM>> is gamma. another advantage of tiff is the ability to
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</EM><BR>
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<EM>> store more than one image in a file. an image viewer
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</EM><BR>
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<EM>> can use this to read/write thumbnails and the like.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> gif is also a bad choice because of its limited color
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</EM><BR>
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<EM>> depth (256 color pallet). if you want to avoid
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</EM><BR>
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<EM>> proprietary nastiness make sure you dont save tiffs
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</EM><BR>
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<EM>> with LZW compression. PNM is simply the easiest format
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</EM><BR>
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<EM>> to read/write and probably the most portable since
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</EM><BR>
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<EM>> images can be stored in plain text.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> overall, tif is the most flexible and should probably
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</EM><BR>
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<EM>> be your default, with png for when you need smaller
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</EM><BR>
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<EM>> file sizes.
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</EM><BR>
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<P>I don't think you really describe the full horror of TIFF incompatibility.
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<BR>
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Colour TIFF isn't as bad as the black and white form used for FAXes, but
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<BR>
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neither is great. Two graphics programs or FAX packages hardly ever read
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<BR>
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each other's files perfectly. LIBTIFF has quite poor tolerance to files
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<BR>
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that don't exactly fit the TIFF spec. - it usually core dumps. Its good at
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<BR>
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producing the right thing, though. Take care storing more than one image in
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<BR>
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a TIFF file, too. There are still a number of programs that cannot cope
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<BR>
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with that, particularly for FAX TIFF's where you might think multi-page
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<BR>
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files were most useful.
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<BR>
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<P>I've nothing against the TIFF spec., although its a bit tag heavy. The
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<BR>
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problem is the majority of implementations suck big time.
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<BR>
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<P>Steve
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<BR>
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<P><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=<391D472B.FF2FDDAE@coppice.org>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0090.html">Stephen Williams: "Re: "Standard" or "best" image format?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0088.html">John Witford: "Re: "Standard" or "best" image format?"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0086.html">pixel fairy: "Re: "Standard" or "best" image format?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0088.html">John Witford: "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 - 05:11:59 PDT</EM>
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