[softwarelist] Re: Importing TIFFs into OPW
- From: Alan Adams <alan.adams@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: davidpilling@xxxxxxxxxxxxx
- Date: Wed, 07 Jun 2006 00:02:17 +0100
In message <4485F791.9000609@xxxxxxxx>
Clive Bonsall <C.Bonsall@xxxxxxxx> wrote:
> Gavin Crawford wrote:
>> In article <44809B77.3020501@xxxxxxxx>,
>> Clive Bonsall <C.Bonsall@xxxxxxxx> wrote:
>>
>>> They are 8bpp grayscale images, scanned at 1200dpi in Photoshop CS2.
>>
>> Is there a need to use such big images? You said in a previous posting
>> that they were line art, if that is the case, then line art only needs
>> to be 1bpp (i.e. black and white). If the images are in fact 8bpp and
>> use more than 2 colours, then I doubt you need them at 1200dpi -
>> certainly not is that is the final output resolution.
>>
<snip>
> "All illustrations, either as CRC (line figures), prints/transparencies
> (photographs) or as digital images. If you're submitting the images
> digitally then they should be saved at a minimum resolution of 1200 dpi for
> line figs/300 dpi for photographs, when saved at the size at which they'll
> be reproduced in the book. TIFF or EPS files, please."
>
The key phrase here is probably:
"when saved at the size at which they'll be reproduced in the book."
Let's suppose you are scanning a drawing full A4 size, or about 11" by
8". In the book, it will be reproduced as a 6" by 4" figure. At 1200
dpi, that is 7200 by 4800 pixels.
To obtain that when scanning requires 7200/11 dpi, or about 700dpi. In
other words the more you reduce the finished size, the lower the
initial scan resolution needs to be.
The catch is that you need to know the finished size before scanning
them in, otherwise scanning at a much higher resolution is the only
safe way.
--
Alan Adams, from Northamptonshire
alan.adams@xxxxxxxxxxxxxxxxxxxxxxxxxxx
http://www.nckc.org.uk/
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