I tried saving a photo from .JPG to .png using Graphic Converter, and the memory size more than doubled. For a large number of photos that would be a considerable increase in storage space. Is the quality so much better or is it only that it stores longer?
Lloyd > Hi James, > > Many thanks for this very informative response to Ray's question. This is of > great help to me as I have thousands of digitized birth/death/marriage/divorce > acts and I have been pondering this very same question. > > I have already converted all my document photos from jpg to TIFF, and can find > no problem, except for the time, to further convert to PNG. > > Excellent presentation for which I am grateful James. > > Kind regards, > > Philippe C > > 2010/1/9 James Devenish <jndeven...@gmail.com> >> >> Hi Ray, >> >> On 08/01/2010, Ray Forma <r...@smartchat.net.au> wrote: >>> My current big concern is in what format to store my photo files. I >>> currently store them as uncompressed TIFF files, a format that has >>> been with us for a long time. Can anyone suggest a better format? >> >> TIFF is a good format because it is publicly documented, has been in >> use for at least 20 years, can be read with open source software >> written in the C programming language (which has remained popular for >> 40 years and still underpins a vast amount of current software), and >> moreover it is basically a wrapper around "raw" image data. However, >> it's certainly not my favourite format, and because it's extensible, >> incompatibilities can creep in. >> >> A better format would may be PNG, which although being much newer, is >> in some regards the modern successor to TIFF. It's: >> - openly-specified >> - non-proprietary >> - patent-free >> - has been standardised by the ISO >> - is readable by open-source C software >> - is "lossless" >> - is already a pervasively-supported format on the world wide web >> <http://en.wikipedia.org/wiki/Portable_Network_Graphics>. >> >> I believe that for these reasons, the National Archives of Australia >> converts TIFF images to PNG in their digital preservation software: >> >> http://www.naa.gov.au/records-management/secure-and-store/e-preservation/at-N >> AA/software.aspx >> >> I don't think you need to convert your TIFF files to PNG, nor need you >> start using PNG if you already use TIFF. But if you were creating your >> archives from scratch starting today, I think you would choose PNG as >> your format. Perhaps you could progressively convert TIFFs to PNGs >> during the natural cycle of re-archiving. >> >> Hope this has been informative, >> James . -- -- The WA Macintosh User Group Mailing List -- Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> Unsubscribe - <mailto:wamug-unsubscr...@wamug.org.au>
