Mike writes ... > in Photoshop 7, under the tiff options when saving as a tiff, the > program offers none/LZW/or Zip in terms of compression. What is the > difference between None and LZW (indeed what does LZW mean)
LZW compression, which is lossless, will examine the pixels for patterns and redundant strings of pixels. Photographic images provide very little in this regard, and you'll most likely find you are saving less than 15% ... and still using a time consuming algorithm to encode and decode when saving and opening. Use TIFF compression according to your own preference. > Secondly in terms of Byte order I save it as mac (since I'm on a mac) > but have been asked by a library to use IBM PC. Can anyone enlighten me > as to the difference. The Mac and PC CPUs read words of data left-to-right and right-to-left, hence the difference. However, modern TIFF readers can determine the difference, and open the file regardless of bit order. If you exchange files and suspect someone will be using an older software, then you should write the TIFF according to their CPU. cheerios ... shAf :o) Avalon Peninsula, Newfoundland www.micro-investigations.com (in progress) =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
