Re: Color accurate workflows (was in search of a D50 Editing colorspace)
Re: Color accurate workflows (was in search of a D50 Editing colorspace)
- Subject: Re: Color accurate workflows (was in search of a D50 Editing colorspace)
- From: Peter Miles <email@hidden>
- Date: Mon, 08 Sep 2014 13:11:49 +1200
On 7/09/2014, at 12:36 AM, Roger Breton wrote:
> Peter,
> Heidelberd Newcolor7000 was an application that offered direct CIE Lab editing. It was the nirvana of color. But that application is long gone.
> I believe Fuji ColourKit Image Editor is still around and offers direct CIE Lab support?
>
Thanks Roger
I will have a look into that.
> Under the hood, every Photoshop operation is not done with 8-bit? For the sake of simplicity, color values are displayed with integers but under the hood, my guess is that it all takes places in 16-bit.
That seems to be what I am seeing too. Onscreen digital color meter shows intermediate color values are being accessed using the opacity slider on a curve that has only a 1 unit change.
But I didn't say that curves were 8 bit under the hood.
I said that the _control points_ to move the curve are in 8 bit resolution. L 60.5 might exist in the reality of a 16 bit space, but I can't move a curve control-point there.
So from the point of view of actually entering in values to move pixels to a particular color location in the colorspace, the RGB co-rodinates represent a more precise representation of my measured color than do whole number Lab values. And the RGB values are there in the same window as the Lab values in spectrashop!
The color diference may be small, but it's avoidable.
There are enough errors already in trying to color match without adding any more. By closely looking at each step in the process and asking myself " is there anything I am doing/not-doing that's contributing to errors?". I hope to slowly improve.
The expertise on this list has been an immense help with this over the years.
> Wasn’t there a discussion that it was 32-bit? I believe the Info palette has an option to directly view 32-bit color (or 31-bit, 1 bit for sign? The details are foggy in my memory).
> For what’s it worth, InDesign supports CIE Lab the entering of decimal values. They may not be retained for display In the Color palette but they are faithfully stored in the Swatches palette. I believe on could bring Swatches in Photoshop from InDesign…
Gosh I didn't realize that.
Thanks or your thoughts, suggestions and your time.
Best Regards
Peter Miles
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