Re: Are gamma discrepancies relevant?
Re: Are gamma discrepancies relevant?
- Subject: Re: Are gamma discrepancies relevant?
- From: Marco Ugolini <email@hidden>
- Date: Thu, 02 Apr 2009 22:49:44 -0700
- Thread-topic: Are gamma discrepancies relevant?
In a message dated 4/2/09 10:35 PM, Klaus Karcher wrote:
> Marco Ugolini wrote:
>> I don't think any of this proves anything much about inherent advantages
>> accruing from the concordance of TRCs between the file and the monitor
>> profile: it only proves that a file will be subjected to the least possible
>> amount of potentially damaging transformations when...it effectively does
>> not undergo any transformations at all! That much I agree with. :-)
>
> So we agree upon the statement that every conversion in 8 bpc leaves its
> marks in the form of banding, missing steps and color shifts.
It creates the possibility of that sort of results, yes.
The *actual* results will vary based on many variables, and banding is not a
*necessary* consequence in each and every instance. Still, it does happen
often enough to be a sizable concern.
> (As the color spaces are not perceptually uniform, some of them are more
> annoying than others.
Meaning just monitor profile spaces, or all color spaces, working spaces
included?
> Along the gray axis we are particularly sensible
> for those quantization artifacts. The larger the differences between the
> encodings, the more artifacts will be visible.) The logical conclusion
> for me is to avoid 8 bit transformations as much as possible, e.g. by
> performing display calibrations or even colorspace conversions with
> higher bit depths inside the monitor, by co-ordinating working- and
> display TRCs -- or by widening the bottleneck of current display interfaces.
Again, I don't think that "co-ordinating working- and display TRCs" does
much to solve the problem, because it's a solution only in the absence of
vcgt curves, which always exist in monitor profiles.
I agree much more strongly on the desirability and usefulness of on-board
high-bit monitor LUTs, or even ... heaven forfend ... high-bit display cards
in the CPU itself!
You may say I'm a dreamer, but I'm not the only one... ;-)
Marco
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden