[Gllug] OT: Scanners

[Ian]

if your scanned image dimensions are in inches, then the actual
image size (pixel) produced will be 'width x dpi' and 'height x dpi'

so if you want somthing to scan u a pic that is 200 pix wide, and is
actually 3 inches wide, then the dpi you want is 200 / 3 = 66dpi,

dpi does mean the 'quality' of the image captured, ie, its means 'dots
per inch' 

for every unit of dpi, when your scanner scans somthing that is one inch
wide or tall it will produce a pic that many pixels wide or tall,

Ian

On Sat, 2002-08-17 at 13:46, will wrote:
> Hi all,
> 
> I eventually went for the epson perfection 1650 USB.  I had to upgrade hotplug
> to get the scanner recognised, but sane works with the scanner fine.  Thanks
> Vince for the help in getting it all working :-)
> 
> Also, when using Xsane, does anyone know how to limit the dimensions of the
> scanned image?  There is a dialog that shows the dimensions of the area being
> scanned but the image that is produced is always massive.  The only way there
> seems to be of altering the dimensions is to alter tbe DPI, so a 50 DPI scan is
> smaller than the original whereas an 800 DPI scan is many times larger than my
> screen.  I would have thought that the DPI settimg should only alter the quality
> for a given dimension, not the dimension, or am I missing something here.
> 
> Will.
> 
> 
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