Message-Id: <199805071611.JAA50730@dns.ccit.arizona.edu> Date: Thu, 7 May 1998 12:09:18 -0400 From: "Wagner,Lynn" <mailto:wagnerl@OCLC.ORG> Subject: Re: "Artifact-free" Reproduction? To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU
Peter, The "artifact-ing" that they are referring to is information which may be introduced into an image though a lossy compression. For example, JPEG compression introduces artifacting--this may take the form of grouped together colors or "blockiness" in the image as the JPEG compression algorhithm works on parts of the image.Tiff is a good format because it lossless compressions are available and altho there are many "flavors" of TIFF, it is a standard format, a good place to start when covering to other file formats.
Lynn Wagner Preservation Resources
> -----Original Message-----
> From: Peter J. Roberts [SMTP:mailto:LIBPJR@LANGATE.GSU.EDU]
> Sent: Thursday, May 07, 1998 11:45 AM
> To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU
> Subject: "Artifact-free" Reproduction?
>
> The technical notes on formats for digital reproductions for the
> Library of Congress - Ameritech award application state, "An
> uncompressed TIFF image [is] provided for artifact-free reproduction
> or
> for future reprocessing as compression standards change." Please let
> me
> know some "artifact" examples.
>
> Thanks and sincerely,
>
> Peter J. Roberts
> Georgia State University