Gustav Brock
Gustav at cactus.dk
Thu Feb 24 11:49:50 CST 2005
Hi all The client wish to store scanned documents, thousands of pages, everything black/white, no pictures - only invoices, contracts and the like. Also, the storage should be in the (or a) database, not as discrete picture files. I've played with the recently discussed file format DjVu and found, that file sizes of less than 10 K is realistic. However, this format seems a little too specialized, thus I've tried using the PNG format which at max. compression allows for files sizes down to about 15 K per page. The file will then be stored as a blob in the database. For display, the blob is extracted to a temp file and viewed. In this way 1000 pages will use about 25 MB of database storage which is acceptable. Before settling on this I would like to know if any of you have experience with what the minimum specs for an acceptable picture of document pages (A4 or Letter) are? I've found that 150x150 dpi, b/w (two colours) and the max. compression level of 9 for PNG is acceptable. But I'm not the client - perhaps you have experience from some of your clients about what is usable in this area? /gustav