[argyllcms] Re: A beginner's questions
- From: Leonard Evens <len@xxxxxxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 02 Feb 2008 11:23:23 -0600
On Sun, 2008-02-03 at 03:49 +1100, Graeme Gill wrote:
> Leonard Evens wrote:
>
> > Can some one remind me of the trade offs among the -a options for a
> > display. I presume the primary considerations are speed and whether or
> > not a particular application can handle it. Also, I'm presuming the
> > vgct tags in the resulting profiles would be essentially the same. Is
> > that correct?
>
> Essentially the choice is between flavours of shaper/matrix
> and a clut based profile. Shaper/matrix is generally smoother
> since there is no table, but can less accurately model an
> arbitrary device response. The flavours are to accommodate
> various application limitations. Gamma is a simplified
> form of shaper. Using a single curve is a simplification
> of independent curves per channel.
> Some application may be faster using a shaper/matrix.
>
> Only clut supports the full range of intents within
> a profile. Because clut uses a table for the multi-dimension
> transform, it can have noticeable stepping in its response,
> depending on the clut resolution and nature of the
> device response.
Thanks for the response. I'm not sure what "stepping" mean, but I
presume it means seeing distinct boundaries between adjacent colors. I
see one such prominent boundary in the timage test image with the
profile produced with -qm -as and to a lesser extent with the one using
-qh -as. Would my shaper/matrix profile be smoother in general but
still produce what I see in the test image? Is there some other way
to produce a smoother test image response with a shaper/matrix profile?
>
> Graeme Gill.
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