# Thread: Update to Epson scanning article: how to bypass all tonal adjustments

1. ## Re: Update to Epson scanning article: how to bypass all tonal adjustments

I don't understand yet if could be a routine workflow for scans or not

2. ## Re: Update to Epson scanning article: how to bypass all tonal adjustments

Originally Posted by foen
I don't understand yet if could be a routine workflow for scans or not
It depends on if you want a routine scanning workflow or not, or better said when you want it or not.

IMHO when you want to make an extensive Photoshop edition/optimization for the image best is making a routine scanning workflow, taking all, and adjusting tonality and etc in Ps.

Also IMHO if one wants to just do some clicks in Lightroom then we can adjust the image with scanner software because we don't plan complex adjustments than may need all information in the negative.

3. ## Re: Update to Epson scanning article: how to bypass all tonal adjustments

The Stouffer Transmission Step Wedge has 21 steps in "increments of .15". Each step is a half f/stop.

If my math is correct, 21 steps amounts to a density range of 10.5 f/stops. 2 exp(10.5) = 1448, which in log (10) terms is 3.16. If a scanner can clearly separate all steps on this target, it can handle a dMax of 3.16

When I tested the Epson scanner using Epson software a number of years back with my usual method of adjusting the histogram, I found that the scanner could separate "16 steps, or 8 stops, which is 256 levels, or in log 10 terms, 2.4".

Can either of the "raw" scans I made yesterday properly separate all 21 steps, or for that matter, significantly more than 16 steps ? By properly, I mean in a linear manner where each step is equidistant from the next.

4. ## Re: Update to Epson scanning article: how to bypass all tonal adjustments

Yes you are right, the 21 model is 1/2 stops steps, the 31 model is 1/3...

...but 21 steps are 20 difference, this is 10 stops, so 21 step is 1/(2^10) the 1st step, this is 1/1024. A range of near exactly 3.0D difference, the stouffer info says 3.05D (http://www.stouffer.net/Photo.htm), but the .05 may be because base density of the wedge.

5. ## Re: Update to Epson scanning article: how to bypass all tonal adjustments

Originally Posted by foen
I don't understand yet if could be a routine workflow for scans or not
This is just test, the negative has yet to be inverted. When it is, a tonal adjustment will occur. This adjustment will be dependant on the method used by software that performs this change.

Originally Posted by Ken Lee

Can either of the "raw" scans I made yesterday properly separate all 21 steps, or for that matter, significantly more than 16 steps ? By properly, I mean in a linear manner where each step is equidistant from the next.
The scanner can do at least 3.05D maybe it can even do 4D like the marketing suggests... But the tests seems to show how the noise seems to build up, and how a small adjustment to exposure can make a difference.

Originally Posted by Pere Casals
the stouffer info says 3.05D (http://www.stouffer.net/Photo.htm), but the .05 may be because base density of the wedge.
That may be true, ken made a 2.53X adjustment, which is probably about 1.3 stops (if the vuescan units are meaningful), "wiping" out the first three steps on the wedge.

6. ## Re: Update to Epson scanning article: how to bypass all tonal adjustments

Funny - My Epson V700 just died. I hadn't used it much lately until making these tests, but it now puts out a funny noise and the red lights flash.

No good deed goes unpunished I guess

I took my old 4990 of the basement shelf and fired it up. Works fine. I wonder if it will cost more to repair the 700 than the price of a new unit.

7. ## Re: Update to Epson scanning article: how to bypass all tonal adjustments

Originally Posted by Ken Lee
Funny - My Epson V700 just died. I hadn't used it much lately until making these tests, but it now puts out a funny noise and the red lights flash.

.
there are 2 sliders to block the scanner for transport, one in the illuminator and another for the bed, check
both are in the right position

8. ## Re: Update to Epson scanning article: how to bypass all tonal adjustments

Thanks Pere. I checked and reset those switches several times.

I was making test scans all day: at a certain point the machine just stopped working.

I presume that some part needs replacement.

9. ## Re: Update to Epson scanning article: how to bypass all tonal adjustments

Ken, I bet you got plenty of mileage from that pile of plastic. You shoot way more than I. I bought a V700 and not the higher models on your website recommendation and tutorials. I have been very happy with mine. It even has survived two moves. That surprised me.

The only good thing about a new one is that the LED does not need a warmup. Or maybe that's a bad thing on second thought. Warmup is good for many things.

I reserve my V700 for only LF negs. Prints I use a scanner app on iPhone.

10. ## Re: Update to Epson scanning article: how to bypass all tonal adjustments

Originally Posted by Ted Baker
This is just test, the negative has yet to be inverted. When it is, a tonal adjustment will occur. This adjustment will be dependant on the method used by software that performs this change.
Do we know what method the ColorNeg/ColorPerfect plugin uses as this to me seems to do a far better job at the inversion than Photoshop, just a shame about the clunky interface

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