[softwarelist] Re: Loading pictures into OPro
- From: Tim Powys-Lybbe <tim@xxxxxxxxx>
- To: davidpilling@xxxxxxxxxxxxx
- Date: Mon, 23 Jun 2008 12:25:47 +0100
In message of 23 Jun, "Torrens (lists)" <Lists@xxxxxxxxxxxxxx> wrote:
> In article <9242dab34f.tim@xxxxxxxxxxxxxxxxxxxxx>,
> Tim Powys-Lybbe <tim@xxxxxxxxx> wrote:
> > For some years now I have been using OPro to construct PDF files that
> > consist of a series of pictures (scans) of old documents. By and large
> > I find that this can only be done successfully by converting the
> > pictures to (large) sprites.
>
> I would have thought jpeg files were ideal. I find O-Pro's handling of
> jpegs exemplary and scans of old documents are suficiently granular that
> gifs are large, as are tiffs.
I did say that I was scanning to around 40K for a TIFF file - and that a
GIF of the same was about 60K.
Well I have taken one of these TIFF and, using the old faithful,
DplngScan, converted it to JPEG. The file size shot up to 566K and the
bits per pixel from 1 to 8. And never mind the slight deterioration one
always gets when converting to JPEG (and noting that GIF also is lossy).
Curiously for the same image, the Sprite file was a mere 334K. But this
retained the 1 bpp.
These respective file sizes are consistent across a wide range of
documents.
These 1 bpp files are scanned at 200 dpi. While this does not give the
best result on screen which has around 80 dpi, it does give a very
legible output on printer which will all handle 300 dpi these days and
most a lot more than that.
But this is not what I was reporting. I was reporting a few problems
with OPro that led to error messages and difficulties.
--
Tim Powys-Lybbe tim@xxxxxxxxx
For a miscellany of bygones: http://powys.org/
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