[sane-devel] Stated scanner resolution. Was: Legal-size scanner recommendations?

[emre]

abel deuring wrote:
> *On 12.02.2010 05:12, emre wrote:
>   
>>
>> I have one more question, it has to do with resolution.  The fi-6130
>> reports a 600 dpi
>> resolution (which seems to me to be more than sufficient).  I have seen
>> some Epson
>> scanners that report 6400 dpi.  I am guessing that higher resolution
>> might be good
>> for slides and photos, but wouldn't be of much use for scanning documents?
>> Thanks again,
>>     
>
> I have serious doubts that even any affordable slide scanner really has
> such a high resolution; for a scanner that can scan an A4 or letter size
> document, 6400 dpi sounds ridiculous. You would need very precise and
> expensive optical and mechanical components to really achieve such a
> high resolution.
>
> Also, consider the size of an A4 size scan with 6400 dpi: That would be
> 210*297*6400*6400/(25.4*25.4), nearly 4 billion pixels. IOW, you could
> fill a terabyte disk with just 250 uncompressed gray scale images...
>
> Typical scan resolutions for A4/letter size are 200 or 300 dpi -- what
> you need depends on your use case, the number of scans you want to store
> and on the storage capacity you can and want to afford.
>
> Abel
>
>   
I just verified at the epson.com website for the Epson Perfection V600 
printer, and they
do report 6400 dpi for their optical resolution.  Granted, it would take 
a lot of disk space,
but it would also seem beneficial to have this resolution for archiving 
of slides and negatives.
Now, if they really have this resolution, I can not say... & I am 
ordering the fi-6130 since
that seems more than sufficient for my purposes.
-Emre

png of epson perfection brochure