brad@looking.UUCP (Brad Templeton) (03/25/89)
I would be interested in experiences people have had in scanning pages of text or line drawings and reducing them. Do people have any figures for average sizes of the reduced bitmaps? Tools like FAX use run-length encoding and some huffman to reduce their bitmaps. Are there any tools around that go significantly better. (Other than OCR, of course.) How small does a typical 8.5 by 11 page of stuff get when scanned at 300 by 300 and compressed? I would guess 40K, but I would like to find something that can take it down to 10K by being really smart about what's being scanned. -- Brad Templeton, Looking Glass Software Ltd. -- Waterloo, Ontario 519/884-7473
rick@pcrat.UUCP (Rick Richardson) (03/25/89)
In article <3003@looking.UUCP> brad@looking.UUCP (Brad Templeton) writes: >I would be interested in experiences people have had in scanning pages >of text or line drawings and reducing them. Do people have any figures > >How small does a typical 8.5 by 11 page of stuff get when scanned at >300 by 300 and compressed? I would guess 40K, but I would like to Define 'typical'. An image I have here that is just few line drawings has these stats: TIFF TIFF TIFF SIZE NO CODING PACKBITS LZW figure 2271 x 2540 721,702 60,980 24,290 x 1 bit That seems to be close to your guesstimate when LZW is used inside the TIFF file. But there really isn't much info in this drawing. -- Rick Richardson | JetRoff "di"-troff to LaserJet Postprocessor|uunet!pcrat!dry2 PC Research,Inc.| Mail: uunet!pcrat!jetroff; For anon uucp do:|for Dhrystone 2 uunet!pcrat!rick| uucp jetroff!~jetuucp/file_list ~nuucp/. |submission forms. jetroff Wk2200-0300,Sa,Su ACU {2400,PEP} 12013898963 "" \d\r\d ogin: jetuucp
jerryd@hpgrla.HP.COM (Jerry Donovan) (03/28/89)
>>I would be interested in experiences people have had in scanning pages >>of text or line drawings and reducing them. Do people have any figures >> >>How small does a typical 8.5 by 11 page of stuff get when scanned at >>300 by 300 and compressed? I would guess 40K, but I would like to > >Define 'typical'. An image I have here that is just few line drawings >has these stats: > TIFF TIFF TIFF > SIZE NO CODING PACKBITS LZW >figure 2271 x 2540 721,702 60,980 24,290 > x 1 bit > >That seems to be close to your guesstimate when LZW is used inside >the TIFF file. But there really isn't much info in this drawing. Yea, whatever typical means. Out of curiosity, I took a paper I am currently working on and scanned it as line art and checked file size on the resulting images. The paper was all text of mostly 8 pt size. Counting the characters in one line and multiplying by the approxamate number of lines says that the page contained about 2500 characters. I then ran both the compressed and uncompressed TIFF images into PKARC to see what that program would do for the images. No compression TIFF 1053042 bytes Compressed TIFF 106828 bytes PKARC (Squeezed) on Compressed TIFF 104912 bytes PKARC (Crunched) on No compression TIFF 99502 bytes Hope this helps. Jerry Donovan ...!hplabs!hpfcla!hpgrla!jerryd
elt@entire.UUCP (Edward L. Taychert) (03/28/89)
In article <3003@looking.UUCP>, brad@looking.UUCP (Brad Templeton) writes: > How small does a typical 8.5 by 11 page of stuff get when scanned at > 300 by 300 and compressed? I would guess 40K, but I would like to > find something that can take it down to 10K by being really smart about > what's being scanned. It all depends on the source, but fax group 4 format should get you down in your target numbers. For Brad: Copyright 1989, Edward L. Taychert - All rights reserved. Ed Taychert ...!rochester!rocksanne!entire!elt