>
> In your images, the brightest part of 
> the scene only hits ~55% brightness, so the other 45% of the sensor's 
> range is not used. 
>
> To remedy this, you can either switch to manual mode and play with the 
> settings (longer exposure, wider aperture, higher ISO) to get a brighter 
> image, or if you want to stick to automatic, you can set the exposure 
> value (EV) target higher. 
>

Thanks Sean,

I suspect one of the issues is that the map I was using (and many others) 
has quite an off-white background, so there is no real white in the image.

I am reading up about this sort of thing, and will experiment to see how 
much difference it makes. However I cannot make it too complicated because 
 I want to do quite a few maps, and I would like to enable other lay people 
to do the same - so the maps can be used in my prototype mapping system 
<http://mapping4ops.org/ShowMaps/M4OPS-index.html>. 

Peter


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