Color Space for scans

Started 2 months ago | Discussions thread
NAwlins Contrarian Veteran Member • Posts: 5,183
Re: Need to know to convert! Also ...

In a similar way, an 8-bit TIFF is every bit as good as a 16-bit TIFF for printing. The extra bits are only helpful if you will perform edits that substantially change the color and/or lightness.

In fact the fastest route to 8 bit banding is to play with the contrast curve and compress it . Try Ctrl + L in Photoshop and bring in the low and mid sliders a tad. Save and reopen your 8 bit file. Now look at the levels ( Ctrl + L) and note that it has changed from a curve to a bar chart.

Those are edits that (if done to a significant degree) substantially change the color and/or lightness. The OP made it sounds like the only editing was spotting or similar.

If you consider altering levels the way to change the colour of an image, then all I can ask is " Do you use Photoshop and do you have a copy for editing " ? I have never heard of anyone using a Levels adjustment for colour changes ! Manipulating the tonal range of the curve is a very common adjustment for preparing a file for print..... if this was a colour changer no one would produce a good print. You do produce large inkjet prints do you ?

Since you've gotten rather snippy, I'll suggest: check your reading comprehension, regarding my earlier post quoted above: "if you will perform edits that substantially change the color and/or lightness." (Emphasis added.) Now, using levels or a unified curve to an appreciable extent will substantially change the lightness; using separately the R, G, and B curves to an appreciable extent will substantially change the color. If you do either of those with an 8-bit file, you may introduce visible banding or the like.

With that established, let's go back to the what OP is doing: it sounded to me like only spotting / dust cleanup / that sort of thing, i.e., not making global (or even sizeable-area local) adjustments to the color and/or lightness. It really doesn't matter what others commonly do, unless the OP is doing it.

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