Various Topics on Scanners

..ger.. ..ail.c..

If I scan a 35mm color negative in @ 64bpp RGBI and save it @ 64bpp
RGBI RAW (Input and Output @ 64bpp RGBI) with specifying (heavy)
Infrared filter, the infrared filtering fails on rescan of the RAW file
for processing to Jpeg.

However, if I specify AUTO bpp for Input and Output when scanning and
saving to a RAW file with (heavy) Infrared filtering, the infrared
filtering does work when rescanning in the RAW file for processing to
Jpeg!

I would say this isn't correct from evaluating the GUI at face value.

Also, I'm seeing no log file being written.

( Vuescan-83 on Gentoo Linux. :-)

..ger.. ..ail.c..

An external image viewer reports the two RAW files are 64 bpp.

I'm stumped as to why the Infrared Filter is failing on one of the 64
bpp RGBI RAW files.

..ger.. ..ail.c..

Ok. Following the help guide and setting all settings to default has
Infrared filtering not working at all now. Not even when I have all
(bpp) settings set to Auto.

..ger.. ..ail.c..

Think I figured and hacked around this issue now.

If a person scans in photos/negatives with Infrared set ON and saves
them to RAW, and later reprocesses the images, and again activates the
Infrared filtering, no Infrared filtering is used if though it appears
the Infrared channel is being processed and used.

To work around this issue and to ensure Infrared channel is able to be
used for later processing with the RAW files, Infrared Filtering should
be deactivated during the initial scans of obtaining the RAW formated
image files. I also specify 64 bpp RGBI for input and output but I
believe this may be an unecessary step.

Am I correct on all this?

..ger.. ..ail.c..

Ok ran into the same problem again where Infrared is not being applied
to the image after all these steps.

But, after a little more fidgeting, I specified the Film Holder to 35mm
instead of the default (didn't think it was needed when scanning from
file). I also manually set the scan (from file) resolution to 2400
instead of the default. One other thing I did was change the output
filetype from JPEG to TIFF.

Well, it's working for now. I wonder if I have to do all my batch
scans by not only by doing this, but also jumping up out of my chair
and doing a one legged dance and after the dance, pulling out all my
hair. (Don't forget, "all my hair" means "all of my hair".)

..ger.. ..ail.c..

One other thing, this scanner does scan kind of noisly. Doing a search
on google for "epson 4490 noise" did turn up some complaints about
putting too much weight ontop of the unit causing mechanical & noise
problems.

Although I have yet to put anything other then paper and 35mm on the
scanner, I am getting a little noise & vibrating with each scan. I do
not think I noticed as much noise using the Windows Epson provided
software for scanning negatives. I'm guessing the Epson Windows
software scans in at a much slower rate, avoiding any noise or c****ing
at the end of each scan. This is probabely one reason for the higher
scan speeds of Vuescan over manuf. supplied s/w.

Argh. Scanning in 35mm at 4800dpi and I'm guessing the speed rate of
each scan is causing allot of vibrating, as such, causing the 35mm
film & holder to jar slightly on each p***. In turn, this causes the
Infrared Channel P*** to not match the Standard Channel P*** causing
Infrared Filtering look like it is not working.

(I think I'll await for further feed back before posting a final
conclusion on this data.)

....

<rogerxx@gmail.com> wrote in message
news:1148859807.767224.31480@j55g2000cwa.googlegro ups.com...
> One other thing, this scanner does scan kind of noisly. Doing a search
> on google for "epson 4490 noise" did turn up some complaints about
> putting too much weight ontop of the unit causing mechanical & noise
> problems.
>
> Although I have yet to put anything other then paper and 35mm on the
> scanner, I am getting a little noise & vibrating with each scan. I do
> not think I noticed as much noise using the Windows Epson provided
> software for scanning negatives. I'm guessing the Epson Windows
> software scans in at a much slower rate, avoiding any noise or c****ing
> at the end of each scan. This is probabely one reason for the higher
> scan speeds of Vuescan over manuf. supplied s/w.
>
> Argh. Scanning in 35mm at 4800dpi and I'm guessing the speed rate of
> each scan is causing allot of vibrating, as such, causing the 35mm
> film & holder to jar slightly on each p***. In turn, this causes the
> Infrared Channel P*** to not match the Standard Channel P*** causing
> Infrared Filtering look like it is not working.
>
> (I think I'll await for further feed back before posting a final
> conclusion on this data.)
>

Have you ever taken the scanner apart and lubricated the Carrier slide
rails?
The vibration may come from the dragging of the carrier on the dry rails.

While you are inside, clean the inside of the gl*** .

As too much weight on the gl***, it might bow in and the carrier might drag
the bottom of the gl***.


--
CSM1
http://www.carlmcmillan.com
--

..ger.. ..ail.c..

Thanks for the reply. I just bought this Epson 4490. I'm planning on
returning it in a few days because of the vibration. I don't think
it's normal.