Re: LS-2000 help

[Bill Glickman <bglick@xxxxxxxx>]

Ed

     Thank you for the response......   just to clarify one thing... during
the drum scan, my scanning software offers Unsharp Masking, not
sharpening.... I was not aware if you were grouping them in the same
category?   If I do not apply any unsharp masking, the images look very weak
vs. applying just a bit.  Are you saying NO, do not apply USM, or do not
apply sharpening during the scan?

       Also, do you ever print to the CSI light Jet 5000?  If so, what
settings do you scan for that...LPI, etc.


Thanks Ed
Bill G




> Hi Bill,
>
> First understand what sharpening does,  Simply put...   To sharpen an
image
> the software that you use finds a black line  and blends a white line
right
> next to it (no black lines the software will use a white lineand place a
> black line there). You can see this if you look close after you sharpen.
You
> can REALLY see it if you oversharpen. I do not like to scan with
sharpening
> ON because the software places those artifacts in the origional data and
you
> cant go back. So I Scan, Color correct then sharpen IF needed. Or apply an
> unsharp mask. So Dont sharpen when you scan.
>
> Ok on to the scaling. Scanning at a large size and reducing is the BEST
> CASE. You are effectivly increasing the scan resolution and the output
will
> be just fine. What I was refering to was the guys that scan an image at
HIGH
> DPI 600, 1200, 2400  and then after the image is saved the BLOW UP the
image
> to 11X14 or 16x20 and wonder why the output looks like poop! What I was
> saying is scan your image to the final size you are going to use. For
> example: If you have a 4x5 and you need an 8X10 Final Scan the image at
200%
> not at the max resolution of the scanner and then blow it up. Even though
> the image file seems big It does not contain the DATA to increase the
size.
> Once again you can DECREESE the size and the resolution will increase but
> with this method you can end up with 1x2" 100Mb image files.
>
> 1 final thing If you really really wanna figure out exactly what to scan
> your images at here is THE formula.......
>
> DPI over LPI Squared +1=256
>
> Where DPI is the scan scan resolution and LPI is the Line screen the
printer
> will be using (Epson printers = 150LPI) Square this value and add1. The
> final number = 256 levels of gray. That is the maximum number of colors
the
> printer scanner combination can reproduce. If after you figure this
formula
> and the answer is more than 256 you are scanning at to high a resolution
and
> wasting disk space. If the number is UNDER 256 you have not scanned at a
> high enough resolution and there is not enough DATA in the image.
>
> OK Too complicated.... here is how I do it. Take the LPI of the printer.
> (Epson type printers = approx 150 LPI) and times that by 1.5 which gives
you
> 225. Set the scanner to 225DPI and scan away.
>
> PHEW! I think thats it. I hope I answered more questions then I created.
> Have fun and BUY THAT PHOTOSHOP book its worth the money and your images
> will love you. And NO I didnt write it.
>
> Ed
>
>
> > ----------
> > From: Bill Glickman
> > Reply To: panorama-l@xxxxxxxxxxxxxxxxx
> > Sent: Monday, August 7, 2000 5:53 PM
> > To: panorama-l@xxxxxxxxxxxxxxxxx
> > Subject: Re: LS-2000 help
> >
> > Ed
> >
> >      Hope you don't mind a few of us tapping into your expertise!  :-)
I
> > use a Howtek 8000 dpi drum scanner with Trident 4.0 software.  A few
> > issues
> > your raised....
> >
> > > Ok just a few guidlines for better scans
> > >
> > > 1. Turn off sharpening
> > > Do that in photoshop during color correction and use SPARINGLY.
> >
> >       Is this true for drum scanners also?  The images look a bit weak
> > with
> > out some USM used.  I try to use low to moderate, but never high.  Is
this
> > correct?
> >
> > > 2. Figure out what the FINAL size of the scan and scan that size.
> > > (magnification %)
> > > For example If you have a 4X5 and you wanna make an 8X10 Scan it at
> > > 200% not at 1200 DPI.....
> > > DO NOT!!! I repeat DO NOT!!!  scan at the Max resolution of the
> > > scanner and then scale the photo up. That makes the WORST possible
scan
> > +
> > > Its a waste of HD space. Your scans should rarely pass 250 dpi. (If
you
> > > wanna know why read the book)
> >
> >            What exactly do you mean by scaling up?  If I want to scan an
> > image and print at different sizes, say 11x14, 20x24 and 40x48, are you
> > saying that if I scan at the 40x48 and then print at 11x14 it will be an
> > inferior scan vs. if I scan it once for each size print output?  If so,
> > that
> > is very fascinating and not widely known.  Possibly I misunderstood what
> > you
> > were getting at.
> >
> > Thanks Ed
> > Regards
> > Bill G
> >
> >