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: Andrew Rodney <email@hidden>
- Date: Mon, 08 Sep 2014 08:58:36 -0600
On Sep 7, 2014, at 7:11 PM, Peter Miles <email@hidden> wrote:
>> 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.
First, when Photoshop is working in what it calls "16-bit" it's actually 15+1 bit. According to Mark Hamburg:
> The high-bit representation in Photoshop has always been "15 1" bits (32767 (which is the total number of values that can be represented by 15 bits of precision) 1). This requires 16 bits of data to represent is called "16 bit". It is not an arbitrary decision on how to display this data, it is displaying an exact representation of the exact data Photoshop is using, just as 0-255 is displayed for 8 bit files.
Next, I don't understand what the Apple DigitalColor Meter (if that's what you're referring to) does that has any usefulness. According to Chris Cox:
>> And that utility misleads on color mangement, because it only sees pixel values on the display, not in the document - so it is useless on color managed applications.
Andrew Rodney
http://www.digitaldog.net/
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