RE: LS-2000 help

["Sokolowski, Ed" <esokolowski@xxxxxxxxx>]

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
> 
>