Dear John and all, My rule-of-thumb for the choice of a compressed graphics format is: Photos (characterized by hue and intensity gradients): use JPG. Drawings (characterized by patches of constant hue and intensity): use GIF.
When in doubt, I sometimes compare both options. For ***CAD drawings, GIF should be superior by factors. Moreover, GIF does not lose information (=quality), as JPG does. Paint Shop Pro or PhotoShop, among others, should be able to do the conversions. Make sure you make the background, which may come more-or less whitish outof the scanner, into really white (or at least exactly the same color), and the blackish of the lines and lettering also into a constant color, so as to profit best from the power of GIF compression. John, please try and report us the results! Regards, Frans From: "John Carmichael" <[EMAIL PROTECTED]> To: "Sundial List" <[email protected]> Subject: More PDF Advantages Date sent: Thu, 28 Feb 2002 18:11:25 -0700 Send reply to: [email protected] > Hi All > > I often email drawings and pictures of sundials to clients and people on > this list. But I always have to be careful not to send too many at once, > or my email will reject my mail for being too large. To email photographs, > I use JPEG format. And to send Delta Cad drawings I scanned the drawing > and send it as a JPEG. I had always thought that JPEGs where the best > format to use for emailing because the files are small and everybody can > open them. > > It occurred to me to compare the file size of a typical JPEG photo to the > same photo in PDF format (I thought for sure the PDF would be the larger). > To my amazement, the PDF file was 20% of the size of the JPEG! The JPEG > was 240 KBs. and the PDF was only 46 KBs. This allows me to quickly email > more pictures on my crummy 56K modem. > > As for emailing Delta Cad drawings, now I don't have to scan them and send > as JPEGs. I can save and send these as PDFs too, and the quality is much > better than a scanned JPEG. > > Perhaps PDFs will replace JPEGs as the photo format of choice in the > future. What do you think? > > John > > John L. Carmichael Jr. > Sundial Sculptures > 925 E. Foothills Dr. > Tucson Arizona 85718 > USA > > Tel: 520-696-1709 > Email: [EMAIL PROTECTED] > Website: <http://www.sundialsculptures.com> > > > - Dr. Frans W. Maes Dept. of Animal Physiology University of Groningen P.O. Box 14 Tel. : +31-50-3632357 9750 AA Haren Fax : +31-50-3635205 The Netherlands E-mail: [EMAIL PROTECTED] ============================================================ -
