From kde-kimageshop Wed Sep 17 20:58:05 2008 From: Matthew Woehlke Date: Wed, 17 Sep 2008 20:58:05 +0000 To: kde-kimageshop Subject: Re: Wanted: channel remapping with implicit colorspace conversion Message-Id: X-MARC-Message: https://marc.info/?l=kde-kimageshop&m=122168515916736 Cyrille Berger wrote: > On Wednesday 17 September 2008, Matthew Woehlke wrote: >>> Yup. If you can make a curve that simulate a multiplication ;) >> Um...? If I apply the brightness filter "2x + 0" (that performs a linear >> mapping 0->0, 128->255), isn't that simply a straight-line curve filter >> with those endpoints? >> >> What am I missing? >> >> A curve is merely an arbitrary function represented as a traditional >> graph (and usually specified as an interpolated curve). Therefore, any >> filter whose output is exactly one pixel for exactly one input pixel, >> with no other (non-constant) inputs, can be represented as a curve. It >> may have an inordinate number of points, but... > > Yes but most curve widget don't allow to all kind of curves (unless you add a > lot of control points). For instance, I have never been able to make a > correct gamma correction with a curve widget. But yes indeed multiplication > is easily done since usually with only two points you get a line. Indeed :-). Fortunately this shouldn't be needed for the things an 'import rawstudio adjustments' tool would need. -- Matthew Your eyes are weary from staring at the CRT. You feel sleepy. Notice how restful it is to watch the cursor blink. Close your eyes. The opinions stated above are yours. You cannot imagine why you ever felt otherwise. -- Unknown (found at http://goldmark.org/jeff/stupid-disclaimers/fun.html) _______________________________________________ kimageshop mailing list kimageshop@kde.org https://mail.kde.org/mailman/listinfo/kimageshop