Your answer NO is not clear since I asked two questions. Could you clarify?
Your answer NO is not clear since I asked two questions. Could you clarify?Short answer is NO. If the image scans with black at 10 and white at 180 with no color correction then turning color correction On, and manually setting the black to 10 and the white to 180 or what ever the points that information on the negative starts and ends results in the same information from the negative.
By having color control off I can tell if I'm getting correct exposure and if my development is correct.
Here is another example: Vigilant six-20 100mm f8.8 Diomatic shutter that runs slow after CLA. Sunny 16 exposure on Arista EDU Ultra 100 in HC110 @ 68°F for 6.5 minutes.
View attachment 191691
Blacks start at 70.
With auto exposure ON the black and white points are clipped. With No Color Correction black is set to 0 white is set to 255. If the tone information starts at 10 and runs to 180 you get a flat line from 0 to 10 and a flat line from 180 to 255.What IO believe I see in my scans is that with Color Correction of, the scan will cover the full range. The resultant picture will have a range on the lower end of the histogram - from let's sy 10 to 180. Then in LR or Elements, I expand the range to 0-255 using the points or Levels.. The result gets me about 95% of the corrections and I tweak from there.
My questions is do I really get more data by pre-adjusting the white and black points (levels) to 0-255 for the scan. Or am I already getting the same bits of data anyway since the range falls into it with as per my example of 10-180? (Note that the scan file size is the same in both cases).
Others have made the argument that if you set levels from 10-180, rather than 0-255, you will get additional data since you won't waste data on the non-data areas 0-10 and 180-255. What is the truth about this? Is there a way to prove it one way or the other?With auto exposure ON the black and white points are clipped. With No Color Correction black is set to 0 white is set to 255. If the tone information starts at 10 and runs to 180 you get a flat line from 0 to 10 and a flat line from 180 to 255.
If you set the black point to 10 and the white point to 180 you get the same information as the 0-255 scan as 10-180 is all the usable information there is.
You can set the Levels in PS to 10 and 180 and have the same image as setting the B&W points in scan software.
I have never heard that. Scan several negatives with both full tonal range and with the 0 line section eliminated (B&W points set) and compare the resulting scans for both adjustment latitude and fine detail in the image.Others have made the argument that if you set levels from 10-180, rather than 0-255, you will get additional data since you won't waste data on the non-data areas 0-10 and 180-255. What is the truth about this? Is there a way to prove it one way or the other?
I agree with you. I suspect the adjustment, if the levels are set 10-180 to match the range of the negative, is just a post scan adjustment by the scanner software that could just as easily be done with a post processing program. You don't get more data setting it with the scan software. But the guy insisted I was wrong.I have never heard that. Scan several negatives with both full tonal range and with the 0 line section eliminated (B&W points set) and compare the resulting scans for both adjustment latitude and fine detail in the image.
By adjustment latitude I'm referring to how much one can change an adjustment without getting adverse effects.
I think setting the level for each color may change the color balance of the photo, but maybe not. I have never tried it.If this is true, than those suggesting setting levels for each of the three colors are also wrong. True?
Here there is a definite. Take a tone or group of tones, cut it into 8 pieces, shift each piece to smooth or roughen the tone, can be done. Take the same tone or group of tones, cut them into 16 pieces, changing the tone or group is now easier as there are more pieces to work with.What about setting levels with 8 vs 16 bits? Are there difference s there?
Why is there a difference between 8 and 16 bit?
anything over 8-bit, so I can't really say there's a difference,
In my experience, wet scanning directly on the plate glass produces the best results with that scanner.
I have an Epson 4990, and I'm thinking about using it for 6x7 scanning. Could you go into more detail about the wet scanning process - do you think the results from this older scanner are good enough to justify the larger format?
Thanks!
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