[Coco] Re: [Color Computer] .djvu vs .pdf revisited
Neil Morrison
neilsmorr at hotpop.com
Tue Jul 12 22:40:04 EDT 2005
Here is a comparison from some 80 Micro's that Ira scanned. Note the size differences. I still prefer PDF but the size difference is about 10 to 1. You can download samples from Ira's site to compare.
http://www.trs-80.com/
Neil
Volume in drive N has no label
Directory of N:\80 Micro
80MICR~6 ZIP 6,364,401 07/01/04 6:57 80micro(1980-01)(djvu).zip
80MICR~8 ZIP 57,888,521 07/01/04 7:00 80micro(1980-01)(pdf).zip
80MIC~10 ZIP 6,872,781 04/11/03 10:07 80micro(1980-03)(djvu).zip
80MIC~12 ZIP 49,998,518 04/11/03 9:46 80micro(1980-03)(pdf).zip
80MIC~14 ZIP 8,455,642 09/12/03 15:48 80micro(1980-05)(djvu).zip
80MIC~16 ZIP 66,424,398 09/12/03 15:48 80micro(1980-05)(pdf).zip
80MIC~18 ZIP 7,955,399 28/10/03 18:13 80micro(1980-06)(djvu).zip
80MIC~20 ZIP 61,996,515 28/10/03 17:55 80micro(1980-06)(pdf).zip
80MIC~22 ZIP 11,396,372 16/10/03 13:09 80micro(1980-09)(djvu).zip
80MIC~24 ZIP 87,689,319 16/10/03 13:12 80micro(1980-09)(pdf).zip
80MIC~26 ZIP 12,434,575 02/10/03 8:21 80micro(1980-10)(djvu).zip
80MIC~28 ZIP 91,049,569 02/10/03 8:21 80micro(1980-10)(pdf).zip
80MIC~30 ZIP 12,670,408 19/09/03 11:52 80micro(1980-11)(djvu).zip
80MIC~32 ZIP 101,484,842 19/09/03 11:55 80micro(1980-11)(pdf).zip
80MIC~34 ZIP 13,041,415 09/09/03 20:37 80micro(1980-12)(djvu).zip
80MIC~36 ZIP 102,702,865 09/09/03 20:56 80micro(1980-12)(pdf).zip
80MIC~38 ZIP 14,134,024 30/10/02 8:17 80micro(1981-07)(djvu).zip
80MIC~40 ZIP 122,419,984 02/11/02 10:07 80micro(1981-07)(pdf).zip
80MIC~42 ZIP 16,328,293 19/11/02 12:46 80micro(1981-09)(djvu).zip
80MIC~44 ZIP 149,235,804 07/05/03 18:34 80micro(1981-09)(pdf).zip
80MIC~46 ZIP 10,828,825 10/01/03 13:29 80micro(1981-10)(djvu).zip
80MIC~48 ZIP 134,541,639 07/05/03 18:35 80micro(1981-10)(pdf).zip
80MIC~50 ZIP 19,848,233 27/01/04 12:46 80micro(1981-11)(djvu).zip
80MIC~52 ZIP 172,711,466 27/01/04 12:47 80micro(1981-11)(pdf).zip
80MIC~54 ZIP 20,445,338 17/12/03 7:58 80micro(1981-12)(djvu).zip
80MIC~56 ZIP 169,670,276 17/12/03 8:58 80micro(1981-12)(pdf).zip
80MIC~58 ZIP 19,951,367 16/04/04 16:00 80micro(1982-01)(djvu).zip
80MIC~60 ZIP 170,515,742 16/04/04 8:29 80micro(1982-01)(pdf).zip
80MIC~62 ZIP 21,213,263 01/12/03 8:58 80micro(1982-08)(djvu).zip
80MIC~64 ZIP 182,430,343 01/12/03 8:59 80micro(1982-08)(pdf).zip
80MIC~66 ZIP 25,937,286 18/08/03 21:58 80micro(1982-12)(djvu).zip
80MIC~68 ZIP 213,556,845 18/08/03 21:58 80micro(1982-12)(pdf).zip
80MIC~70 ZIP 22,553,380 23/03/04 20:42 80micro(1983-05)(djvu).zip
80MIC~72 ZIP 175,781,830 12/11/03 16:19 80micro(1983-05)(pdf).zip
80MIC~74 ZIP 16,042,105 03/10/02 11:49 80micro(1983-09)(djvu).zip
80MIC~76 ZIP 152,774,795 03/10/02 11:49 80micro(1983-09)(pdf).zip
80MIC~78 ZIP 17,364,341 03/10/02 11:53 80micro(1983-10)(djvu).zip
80MIC~80 ZIP 167,604,342 03/10/02 11:54 80micro(1983-10)(pdf).zip
80MIC~82 ZIP 19,738,355 21/02/03 12:20 80micro(1983-11)(djvu).zip
80MIC~84 ZIP 149,524,260 22/06/03 9:54 80micro(1983-11)(pdf).zip
80MIC~86 ZIP 19,310,200 27/05/03 7:51 80micro(1983-12)(djvu).zip
80MIC~88 ZIP 135,453,978 27/05/03 6:02 80micro(1983-12)(pdf).zip
80MIC~90 ZIP 11,327,774 21/08/03 19:20 80micro(1984-09)(djvu).zip
80MIC~92 ZIP 91,952,271 21/08/03 20:23 80micro(1984-09)(pdf).zip
80MIC~94 ZIP 11,841,445 17/07/03 5:59 80micro(1984-11)(djvu).zip
80MIC~96 ZIP 93,626,763 17/07/03 7:19 80micro(1984-11)(pdf).zip
80MIC~98 ZIP 12,856,447 10/07/03 13:39 80micro(1984-12)(djvu).zip
80MI~100 ZIP 16,773,120 11/06/05 21:53 80micro(1984-12)(pdf).zip
80MI~102 ZIP 10,113,989 16/05/03 8:13 80micro(1985-01)(djvu).zip
80MI~104 ZIP 74,610,293 15/05/03 16:31 80micro(1985-01)(pdf).zip
80MI~106 ZIP 8,556,664 10/02/03 7:43 80micro(1985-02)(djvu).zip
80MI~108 ZIP 63,457,179 22/06/03 9:53 80micro(1985-02)(pdf).zip
80MI~110 ZIP 7,682,705 22/04/03 10:29 80micro(1985-03)(djvu).zip
80MI~112 ZIP 62,455,347 22/04/03 9:11 80micro(1985-03)(pdf).zip
80MI~114 ZIP 8,312,268 25/04/03 16:54 80micro(1985-04)(djvu).zip
80MI~116 ZIP 60,862,349 22/06/03 9:53 80micro(1985-04)(pdf).zip
80MI~118 ZIP 8,509,283 07/05/03 14:55 80micro(1985-05)(djvu).zip
80MI~120 ZIP 61,468,731 07/05/03 16:09 80micro(1985-05)(pdf).zip
80MI~122 ZIP 8,234,567 12/05/03 6:53 80micro(1985-06)(djvu).zip
80MI~124 ZIP 60,838,957 12/05/03 5:57 80micro(1985-06)(pdf).zip
80MI~126 ZIP 8,180,462 30/04/03 16:46 80micro(1985-07)(djvu).zip
80MI~128 ZIP 57,323,577 30/04/03 16:08 80micro(1985-07)(pdf).zip
80MI~130 ZIP 7,832,675 05/05/03 14:55 80micro(1985-08)(djvu).zip
80MI~132 ZIP 63,066,894 05/05/03 15:10 80micro(1985-08)(pdf).zip
80MI~134 ZIP 7,995,360 26/06/03 16:21 80micro(1985-09)(djvu).zip
80MI~136 ZIP 64,599,855 26/06/03 15:39 80micro(1985-09)(pdf).zip
80MI~138 ZIP 8,080,378 30/08/03 22:00 80micro(1985-10)(djvu).zip
80MI~140 ZIP 59,340,557 30/08/03 22:03 80micro(1985-10)(pdf).zip
80MI~142 ZIP 8,303,989 13/06/03 14:43 80micro(1985-11)(djvu).zip
80MI~144 ZIP 65,325,094 14/06/03 12:48 80micro(1985-11)(pdf).zip
80MI~146 ZIP 9,136,798 20/06/03 11:57 80micro(1985-12)(djvu).zip
80MI~148 ZIP 71,991,075 20/06/03 10:48 80micro(1985-12)(pdf).zip
80MI~150 ZIP 10,010,902 04/02/03 11:34 80micro(1986-03)(djvu).zip
80MI~152 ZIP 77,611,734 22/06/03 9:52 80micro(1986-03)(pdf).zip
80MI~154 ZIP 9,950,008 29/12/03 15:28 80micro(1987-04)(djvu).zip
80MI~156 ZIP 94,703,905 29/12/03 15:28 80micro(1987-04)(pdf).zip
80MI~158 ZIP 20,832,838 16/05/04 20:28 80micro(1987-08)(djvu).zip
80MI~160 ZIP 55,941,120 28/05/03 7:19 80micro(1987-08)(pdf).zip
78 file(s) 4,207.66 MB
----- Original Message -----
From: Michael Wayne Harwood
I spent my lunch hour doing comparative tests using a demo of Lizard Tech's "Document Express Enterprise" DjVU compressor and Adobe's Acrobat Suite v6.0. I have found that at very high compression levels the quality of .djvu is much better that .pdf - unfortunately that level of compression looks horrible in both.
At high visual quality levels the formats are about tied in both size and quality. I used two different version of source scans in the .tif (non lossily compressed) format. The first (hires) is the original scans at 300ppi, and the second (lores) are those same .tif files scaled to 781x1082.
Using the first batch of images (hires) I was able to produce documents that looked excellent and used a little less than 1mb per page. With the second batch of images (lores) I was able to achieve the file size I was hoping for (less than 180k average per page) in both file formats and the documents look very acceptable. At this point I see no compelling reason to use .djvu given these reasons and the overwhelming response of people on this list in favor of the .pdf format.
In my opinion the only question that remains is whether to have higher quality images (1mb or so per page) using more DVDs or lower quality images (160kb or so a page) using a single DVD. I would be happy to post the files I created, but in the interest of quicker download times perhaps someone would be willing to post the files on a server on the other side of a faster link than I have.
Regards,
Michael Harwood
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