[softwarelist] Loading pictures into OPro
- From: Tim Powys-Lybbe <tim@xxxxxxxxx>
- To: davidpilling@xxxxxxxxxxxxx
- Date: Mon, 23 Jun 2008 09:26:59 +0100
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.
Using alternative strategies has one or two problems:
First: Set OPro to load by Reference for files above 210 Kbytes.
--------------------------------------------------------
To demonstrate this problem, I made a one-page document into which I
loaded a 3.5M Tiff file, with 16-bit colour. It loaded OK. Then:
Saved it,
Closed the file
Reloaded the file and got the error "Bad Page Number"
The file was in fact corrupt and had to be deleted. Sometimes I have
had to kill OPro to clear this.
Second: Load in 1-bit Tiff files
------------------------
Again I started with a one-page document. The one-bit Tiff files are
black and white, made by scanning with DPlngScan and thus of very low
size. Trying to load these produces the error:
"Unknown or missing variable (internal number 6282)"
The file is not corrupted by this and loading a usable graphics file
over the same page gives a usable result.
Third: Load in 1-bit Gif files
-----------------------
Using the same file as in the previous example I converted them to Gif;
this increased the size from, say, 40 Kbytes or so to 60 Kbytes or so.
The Gif files would load into OPro with no trouble; but saving the OPro
file resulted in a file of 6 Mbytes (yes, Mega).
Fourth: Load in 1-bit Sprite files
--------------------------
Using the same file as in the previous two examples, but converted to
sprite of, say, 256 Kbytes, the resulting OPro file was totally OK and
was a mere 263 Kbytes.
All these images have been scanned in by DPlngScan, which is perhaps my
most frequently used of all RISC OS applications, e-mailing apart.
A totally alternative strategy might be to use another program to
assemble all the images to join them together into one PDF file. But I
have yet to find a program that does this as easily as OPro - and I have
tried Easiwriter. Any suggestions, anyone?
--
Tim Powys-Lybbe tim@xxxxxxxxx
For a miscellany of bygones: http://powys.org/
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