[GreenKeys] bitsavers at Internet Archive

[COURYHOUSE at aol.com]

Hi  Sam - The fold out diagram issue  just hit  me  on  a map  from Bell 
Telephone Quarterly I needed.  Yep!  it was  there and yep!  it  was  folded  
up....I am just  hoping  we have it over in the anex in  hard copy. I do 
love all  our  stuff  we have in hardcopy  but it  sure takes  up   lots of  
room  to store...
 
You bring up google books...  some of  their stuff is   downright poorly 
done...  and   also   much    lacks the ability to get a file of it and  you 
end up  having to  screen capture images...  unless... there is  something I 
am   missing... please advise!?
 
 
For the  most  part  though  I  am   glad   all this  stuff is out there 
even some of the poorly  done  stuff... because if it was not   we would have 
nothing  to  work  with....   but  yea  lets   continue  to  raise the 
fold-out issue!
 
Ed#   smecc.org
    
 
 
In a message dated 4/3/2013 3:11:25 A.M. Mountain Standard Time,  
s.hallas at ntlworld.com writes:

COURYHOUSE at aol.com wrote:
> As a general rule   though,  books that are in the main parts of
> Internet  archive   are scanned   at a higher  res    than   what is at
> bitsavers it seems... Well .  for   line  drawings  etc  no biggie,
> but  when  you want a nice photograph of  something to include in  a
> display the *Prelinger* stuff seems  cleaner.

I would  beg to differ, Ed. I expect scans of text and line drawings to
be at least  300 dpi for clarity. Photographs can be as low as 150 dpi,
depending on the  screening frequency, and still be clear.

Books that I've looked at from  archive.org are often stored in a way 
that uses two different scan  desities. Each page is an amalgam of a B&W 
image at a high resolution  and a greyscale or colour image at lower 
resolution. Using the extract  images tool in Acrobat produces both 
separately.

I just looked at  an example from Google Books found at archive.org. (The 
Telephone 1891  Preece & Maier, 1891) The frontispiece photo consists of 
a B&W  image at 600 dpi with the caption and some dark shadows at the 
edges. The  main photo is at 300 dpi in greyscale. However another (The 
Practical  Teelphone Handbook, Poole, 1892) from archive.org, but not 
Google, is only  at 166 dpi but in B&W and colour.

One of my gripes with archived  books is that the images are very often
in colour for black and white  originals. It makes for mega file sizes
without adding any  information.  The first book above (in B&W & 
greyscale) 16 MB  for 555 pages whereas the second is 27 MB for only  308 
pages in  colour but at lower resolution.

An unforgivable error I found in some  books is that fold out diagrams
were left folded up, thereby ruining the  whole point of the accompanying
text.

Rant  over...

Cheers,
Sam

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