scanning slides

[ameerat42]

Easy! It's for you to find one day after several years of using the scanner and to open and say:
"Oh-h-h! I didden know that!" After which you lose it again fairly forthwith.

[landyvlad]

What settings would be recommended for colour 48 bit or 24 bit?
Resolution? ?dpi

[ameerat42]

None! AbsoLUTEly nONe!

O-hhhh, whyyyyy? I hear you ask.

Well, what are you scanning? A slide? A negative? What's its dynamic range like?

As a general rule only, it has been proposed that slides can be scanned at 24-bit color depth, while
negatives can use (well, the next level up) 48-bit, due to a neg's ability to record a higher dynamic range.

Now, DPI??? (DPI can stand as a parameter of resolution, but then so can bit depth.) Well, now that you have the scanner, why
don't you try a number of trial scans? Take a slide/neg or a couple thereof. Apply a standard procedure to reproduce each one.
For example, say, try a particular slide; choose a color depth (make it 24-bit for starters), now scan it at a couple of different resolutions.
Maybe try 1500 DPI, then a 2000 DPI, and maybe a 2500 DPI. Assess each one. Try the whole lot at a higher bit-depth.
...and so on...
...

After a while you will begin to get a hang of things. Of course, post up a result or two, ask Qs about them, and go from there.
Contrary to hype, there is no hard set of rules that "guarantee" results.

I await your findings

[ricktas]

What settings would be recommended for colour 48 bit or 24 bit?
Resolution? ?dpi

To access all the information within a 48 bit image file, you need a good graphics card that can I/O 48 bit and then a monitor that can display 48 bit. Then if you want to print, you need a 48 bit printer. The vast majority of monitors and even printers these days are 24 bit (true colour), so unless you have huge plans for the scanned files into the future, scanning at 48 bit doesn't mean a better image on your monitor or in print, at this time. You can get 48 bit printers now. Having said that a lot of the newer monitors can support 32 bit colour, and yes you can buy 48 bit graphics cards for reasonable prices, but to see true 48 bit colour you need every step of the process to be able to support 48 bit colour.

So really it is your choice which you use, but do your research into the processing hardware you have and see if it can support 48 bit, first. Just cause you can scan at 48 bit, doesn't mean you have to, 24 bit is damn good quality. Most current digital cameras are between 12-16 bit

[landyvlad]

Ok thank you.

I have done a couple of films so far. Pleased with the unit.
After doing lots of googling I used settings of 48 bit with 3200 dpi.

I did try higher DPI settings but there was a lot of noise, and no perceived advantages.
Didn't know that lower than 3200 dpi would be better?

Given you comments I will go to 24 bit in future for slides.
These aren't the quality that would justify 48bit in the first instance anyway.

If I was going to post some samples on here for comment, what format / size would I use?
Currently they are in .tif format (and huge) of course.

Thanks.

[landyvlad]

Given you comments I will go to 24 bit in future for slides.
These aren't the quality that would justify 48bit in the first instance anyway.

If I was going to post some samples on here for comment, what format / size would I use?
Currently they are in .tif format (and huge) of course.

Thanks.

Obviously I want people to see what quality I am getting.


Anyone?

[Mark L]

[QUOTE=landyvlad;1305179

If I was going to post some samples on here for comment, what format / size would I use?
[/QUOTE]
What format / size are you allowed to post any photo directly to AP?
To state the obvious, JPEG at 1024 on the longest side, unless you are linking from somewhere else. But you know that.

[ameerat42]

Obviously I want people to see what quality I am getting.


Anyone?

LV. Do this:
1. Post a normal sized image suitable for AP as a JPG (all usual stuff) and then
2. Make a couple - or a couple more - 100% crops of particular areas you want to show details of.
3. Post them up in the usual way for AP.

Now, I'm getting to your of what a 100% crop is:

A: Using the likes of Photoshop, view you image at "Full Size". Take your selection tool and copy out interesting sections you'd like
to post as illustrations. Paste these into new documents and save as jpegs. When you make your selections, you can set the size you copy
out, eg 500x500 pixels.

Now the good thing about doing this is that you can take those copied of sections from ANY file - large TIFFs or anything. You can save the
selections as jpegs anyway and... Bingo!

Oh, now remember, make the selections NOT TOO large, so that you save them WITHOUT re-sizing. If you re-size, they will
no longer be 100% crops.
Am.