[softwarelist] Re: Image display quality in DPlingscan

In a recent message           David Pilling 
<flist@xxxxxxxxxxxxxxxxxxx> wrote:

> In message <a9ba75944f.Dave@xxxxxxxxxxxxxxxxx>, Dave Barnett
> <dave@xxxxxxxxxxxxxxxxx> writes
...
>>
>>As I sometimes use DPlingscan to change image file types or to change
>>the size or dpi., I would like a more instant view of what to expect.
>>Can I get a better image display?
>>
>>RPC-SA, RISC OS 4.39, RAM 128M, vRAM 1M.  DPlingScan 1.24.

> You get the best image quality by selecting the Magnify tool and
> clicking on "rational".

Thanks, I'll try that.

> All I can suggest as a quick check, is in DPScan (on RISC OS) use the
> Edit->Scale facility and set the destination to 90 dpi, you can undo out
> of this.

> With on screen display there is a trade off between how fast the display
> is and how good the quality. You can see that the DPScan scale function
> takes some time.

Indeed.

> JPEG being a "lossy" format can degrade your images, all other formats
> are "loss less" so you get out exactly what you put in.

Noticed that, I avoid it if at all possible.  If only sites offering 
downloadable images of text would do the same.   I find PNG gives 
reasonable compression and good quality.

Despite all that, a correspondent in OZ complimented me on the quality 
of the software that I had used to scan a page of print with a small 
font size.  I'll now go and have another try at scanning some family 
trees that I found in an old book.  (Hint: Be careful not to trap the 
edges of fragile pages between the glass and the edge of the scanner 
frame.  I have tried to fill the gap on mine with varnish.)


-- 
Dave
Keep GMT all year
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