From kde-kimageshop Sat Dec 01 11:25:15 2007 From: "Richard Spindler" Date: Sat, 01 Dec 2007 11:25:15 +0000 To: kde-kimageshop Subject: Re: colour blending Message-Id: <4af8d6ff0712010325i157acebfmf6a8a8c15778e6df () mail ! gmail ! com> X-MARC-Message: https://marc.info/?l=kde-kimageshop&m=119650834723674 What about a simple blur? Or is there something like edge blur? Or a glow. 2007/12/1, Uwe Andersen : > Hi, > > I have not a *real* krita question but rather a more fundamental question > regarding colour handling. > But maybe you want to read (and answer) it anyhow... > I created a colour bar with a black, blue, red, magenta, green, cyan, yellow > and a white bar. > I put the colours directly side by side. So if I take a look at e.g. the > blue-red-border at pixel level I see that a "blue" pixel is directly adjacent > to a "red" one. > If I put this picture onto a video output(SDI) and then into a waveform > monitor it shows some ugly overshots between each colour border. > I've taken a look into a "professional" colour bar (from a Tektronix TG700 > Video Generator) and found out that the colours fade from one to another > using five pixel for blending. > I think my solution putting the colours directly to each other introduced some > high frequencies at signal level. > My simple questions are: Is there some kind of filter (a low-pass filter??) to > eliminate these frequencies? Is there such a filter in Krita? > If yes, how is it named? > > Kind regards and thank you for reading all this, > Uwe Andersen > > P.S.: I created the colour bar directly in the YCbCr -Space(what is used on > SDI) so that it can be excluded to be a colour model conversion problem. > > _______________________________________________ > kimageshop mailing list > kimageshop@kde.org > https://mail.kde.org/mailman/listinfo/kimageshop > -- Are you teaching the What and the How but without the Why and the When? _______________________________________________ kimageshop mailing list kimageshop@kde.org https://mail.kde.org/mailman/listinfo/kimageshop