newer CIS scanners

[Guest]

I have a Epson 3170 and a Panasonic KV-S6050WU. The Panasonic is old and only 8-bit grayscale
but the scanned image compares very closely to the Epson after adjusting gamma and contrast,
this considering the Epson scans grayscale internally at 16-bit.
My main goal is good readability as I scan many text books ( and behold, I read my scanned
books afterwards! )

Does anyone know if newer mid-range CIS scanners offer the same quality as CCD scanners?
I have read reviews about the Panasonic KV-S2026C and the Fujitsu S500 CIS scanners saying
the image quality is excellent, but I haven't seen any comparisons where they scan the same page
on different scanners. Surely Panasonic wouldn't put a CIS sensor in a scanner if it wasn't up to their established standards?

-Peter

 

[CSM1]

I have a Epson 3170 and a Panasonic KV-S6050WU. The Panasonic is old and
only 8-bit grayscale
but the scanned image compares very closely to the Epson after adjusting
gamma and contrast,
this considering the Epson scans grayscale internally at 16-bit.
My main goal is good readability as I scan many text books ( and behold, I
read my scanned
books afterwards! )

Does anyone know if newer mid-range CIS scanners offer the same quality as
CCD scanners?
I have read reviews about the Panasonic KV-S2026C and the Fujitsu S500 CIS
scanners saying
the image quality is excellent, but I haven't seen any comparisons where
they scan the same page
on different scanners. Surely Panasonic wouldn't put a CIS sensor in a
scanner if it wasn't up to their established standards?

-Peter

As a general rule, CIS sensors are not good of book scanning because of the
curve imposed by the spine of the book.

CIS sensors have almost zero depth of field, so unless you get the book
absolutely flat on the scanners glass, parts of the scan will be out of
focus.
That is very bad for reading and for OCR.

The 'C' in CIS means "Contact". Meaning that the document must be in contact
with the glass.

CIS scanners are much cheaper to build scanners from, they don't have the
optics.