[Coco] [Color Computer] 1984 djvu conversion

[Bob Devries]

Just as a comparison, I did the following:

Black & white scan saved to TIFF file: 1.04MB
Colour scan saved to JPEG file: 740KB
Black & white scan saved directly to PDF file: 17KB

Note however that the TIFF file used no compression at all. I could have 
chosen LZW or ZIP compression when I saved it in Photoshop, with 
approximately 90%+ reduction in file size.

--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "Tim Fadden" <t.fadden at cox.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Tuesday, May 19, 2009 11:38 AM
Subject: Re: [Coco] [Color Computer] 1984 djvu conversion


> Strangely enough, I just scanned 1982-07, 64 pages.  I did the pages with 
> color in color, and the rest greyscale, 300dpi.  The total size of the 
> pages in jpeg images is 97 meg.  I then used two different programs to 
> create a pdf document.  Both were set for 300 dpi. 100% quality.  one 
> converter made a pdf at 41meg, and the other turned out 168 meg!  go 
> figure that out!...   I looked at both of them with acroread and enlarged 
> to 1600%  I couldn't tell the difference between the files.   All pdf 
> creators are not equal!..
>
>
> Tim
>
>
>
>
> Bob Devries wrote:
>> I'm using ScanGear CS which came with my CanoScan 5200F scanner. It 
>> integrates into Adobe Acrobat Pro 6 through the TWAIN interface.
>>
>> I'm scanning in black & white at 300DPI. There are no other settings 
>> available in that mode.
>>
>> -- 
>> Regards, Bob Devries, Dalby, Queensland, Australia
>>
>> Isaiah 50:4 The sovereign Lord has given me
>> the capacity to be his spokesman,
>> so that I know how to help the weary.
>>
>> website: http://www.home.gil.com.au/~bdevasl
>> my blog: http://bdevries.invigorated.org/
>>
>> ----- Original Message ----- From: "Tim Fadden" <t.fadden at cox.net>
>> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
>> Sent: Tuesday, May 19, 2009 11:19 AM
>> Subject: Re: [Coco] [Color Computer] 1984 djvu conversion
>>
>>
>>> There are lots of variables.  Did the scanner do color, greyscale, or 
>>> line art?  When the pdf was made, was it created at 300dpi, also there 
>>> are settings for % of quality.  All of those affect the file size.
>>>
>>> Tim
>>>
>>> Bob Devries wrote:
>>>> HAHAHAHA,
>>>>
>>>> I was going to suggest that our scanners "downunder" are more 
>>>> efficient, but Dez is an Aussie too. Of course, he *IS* closer to the 
>>>> equator than I am.....
>>>>
>>>> -- 
>>>> Regards, Bob Devries, Dalby, Queensland, Australia
>>>>
>>>> Isaiah 50:4 The sovereign Lord has given me
>>>> the capacity to be his spokesman,
>>>> so that I know how to help the weary.
>>>>
>>>> website: http://www.home.gil.com.au/~bdevasl
>>>> my blog: http://bdevries.invigorated.org/
>>>>
>>>> ----- Original Message ----- From: "John W. Linville" 
>>>> <linville at tuxdriver.com>
>>>> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
>>>> Sent: Tuesday, May 19, 2009 9:55 AM
>>>> Subject: Re: [Coco] [Color Computer] 1984 djvu conversion
>>>>
>>>>
>>>>> On Tue, May 19, 2009 at 09:50:01AM +1000, Bob Devries wrote:
>>>>>> I have difficulty understanding why the PDF files of these magazines 
>>>>>> are
>>>>>> so large.
>>>>>>
>>>>>> I have scanned some of my copies of Australian Rainbow. All pages 
>>>>>> except
>>>>>> the front and back covers are black & white, and I scanned them at 
>>>>>> 300
>>>>>> DPI. They are readable... as much as the originals were readable (but
>>>>>> that's another story)... but they are not text searchable.
>>>>>>
>>>>>> Of the 30 magazines I scanned, the largest PDF file size was 6939KB 
>>>>>> from
>>>>>> 76 pages (275mm x 205mm) and the smallest 1800KB from 60 pages.
>>>>>
>>>>> Perhaps you are measuring using metric bytes?  I think they are 
>>>>> bigger...
>>>>>
>>>>> :-) :-) :-)
>>>>>
>>>>> John
>>>>> -- 
>>>>> John W. Linville Someday the world will need a hero, and you
>>>>> linville at tuxdriver.com might be all we have.  Be ready.
>>>>>
>>>>> -- 
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>>>>
>>>>
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>>>
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