[Coco] Re: Coco Digest, Vol 22, Issue 75

[farna at att.net]

The scans are so small using "line art" mode because you are correct -- it's true monochrome. The scanner only looks for white and black -- nothing between. Color and grey scale images have LOTS more information to store, and are therefore much larger. Line art mode at a higher dpi (say 150-200) would probably be great for OCR, but photos wouldn't come through at all -- they would be on big dark spot with a few light spots. 

--
Frank Swygert
Publisher, "American Independent 
Magazine" (AIM)
For all AMC enthusiasts
http://farna.home.att.net/AIM.html
(free download available!)
			

 -------------- Original message ----------------------

> Message: 1
> Date: Sat, 16 Jul 2005 14:37:44 -0700
> From: Kevin Diggs <kevdig at hypersurf.com>
> Subject: [Coco] OT:  scanners
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Message-ID: <42D97E28.8050608 at hypersurf.com>
> Content-Type: text/plain; charset=us-ascii; format=flowed
> 
> Hi,
> 
> 
> 	This is off topic but kinda inspired by the Rainbow archive project. I 
> recently picked up a Lacie Silverscanner II off eBay. This thing has 
> separate red, green, and blue lamps. Is this common?
> 
> 	I've been playing with scanning the June 91 issue. Scans at 100 dpi (or 
> ppi or lpi ... I don'k know) and line art mode (monochrome?) are 
> readable. OCR would require some REALLY good software. PNG files of 
> these black and white text pages are about 55k. For some of the pages 
> that are not black and white I've tried 8-bit color and 8 and 4 bit 
> grayscale. The 8-bit grayscale mode, in particular, seems to encourage 
> the scanner to magnify imperfections on the pages. This produces rather 
> large files. Some with PNGs approaching 1M.
> 
> 					kevin