Econet Micro Guide by Christopher Dawkins

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dangardner
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Location: The Wicklow Mountains

Econet Micro Guide by Christopher Dawkins

Postby dangardner » Tue Nov 13, 2012 8:48 pm

I just spotted this on Abebooks (thanks to Advance in another thread!) and remember it as being a very useful Econet reference, with information that could not be found elsewhere in the Econet AUG or other publicly available sources.

Before I buy it to scan for posterity and my own re-edification, does anybody have scans of this already? A quick Google didn't turn up anything much beyond a reference to the book by jgh. Failing that, does anybody have any good tips on scanning books and/or free OCR software for Windows?

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Advance
Posts: 362
Joined: Fri Jan 29, 2010 5:22 pm

Re: Econet Micro Guide by Christopher Dawkins

Postby Advance » Tue Nov 13, 2012 9:21 pm

Glad that teasing Martin had such a good result. I for one will look out for those scans.
Can't help wondering if I've shot myself in the foot by plugging that site, though - there's enough competition for Beeb stuff on ebay.
Hugh

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jgharston
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Re: Econet Micro Guide by Christopher Dawkins

Postby jgharston » Sun Nov 18, 2012 10:46 am

dangardner wrote:I just spotted this on Abebooks ...
Before I buy it to scan for posterity and my own re-edification, does anybody have scans of this already?
It's quite a good book, I have a copy. It's 100 A5 pages, I could scan it if nobody else has.
Failing that, does anybody have any good tips on scanning books and/or free OCR software for Windows?
I use an EPSON DX-5000 printer/scanner for scanning and FineReader for OCR-ing. Text will happily scan and OCR at 300dpi. For diagrams I scan at 600dpi 256 colour greyscale, then using PaintShopPro I resample down to one of:
A3 4096 pixels long side (eg Z80 CoPro)
A4 2048 pixels short side for high detail
A4 1024 pixels short side for low detail (eg LCD)
A5 2048 pixels long side for high detail (eg JGH-MIDI)
A5 1024 pixels long side for low detail detail (eg Border Colour)

I then reduce the colours down to 16, then manually pull up/push down the outlying greys to full black/white until I have only four greys. I then change the colour depth back up to 256 and back down to 16 to merge all the recoloured greys into four.

For example, after reducing down to 16 greys I could have a pallette of:

00 10 20 30 40 50 60 70 80 90 A0 B0 C0 D0 E0 F0

I change the pallet to be, for example:

00 00 00 00 00 00 00 70 80 F0 F0 F0 F0 F0 F0 F0

Changing the number of colours up to 256 and back down to 16 gives a palette of

00 70 80 F0 F0 F0 F0 F0 F0 F0 F0 F0 F0 F0 F0 F0

and what used to be, for example, a run of different logical colours with the same physical colour (eg 0 1 1 2 1 1 1 0 1 2 2 1 1) becomes a run of the same logical colour (eg 0 0 0 0 0 0 0 0 0 0 0 0 0); which, as I save the images as a compressed file (usually GIF) results in much smaller files.

Code: Select all

$ bbcbasic
PDP11 BBC BASIC IV Version 0.25
(C) Copyright J.G.Harston 1989,2005-2015
>_

dangardner
Posts: 161
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Location: The Wicklow Mountains

Re: Econet Micro Guide by Christopher Dawkins

Postby dangardner » Sun Nov 18, 2012 3:21 pm

Thanks for all the advice! Since nobody seemed to be replying, I bought the book anyway in case it disappeared :)

I've got an HP ScanJet 4070 which does 2400dpi, so it should do the job. I'll have a go at scanning it myself and if the results are awful, I might ask for some assistance, if you don't mind.

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Advance
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Re: Econet Micro Guide by Christopher Dawkins

Postby Advance » Sun Nov 18, 2012 4:33 pm

Check your PMs.

fleetstreet
Posts: 21
Joined: Sun Apr 07, 2013 8:14 pm
Location: Sydney, Australia

Re: Econet Micro Guide by Christopher Dawkins

Postby fleetstreet » Thu Sep 05, 2013 12:08 am

Is there an image of the cover? I'm trying to find a book I had in school, this might be it.

I'll happily take a scanned copy :D

matt_nottm
Posts: 18
Joined: Sat Feb 11, 2017 11:54 am

Re: Econet Micro Guide by Christopher Dawkins

Postby matt_nottm » Tue Feb 14, 2017 9:24 pm

Does anyone have a scanned PDF of the Econet Micro Guide by Christopher Dawkins? It is circa £60 on eBay and even more on Amazon?


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