Ah fantastic, that second one did it perfectly. Much obliged. On 16 Jun 2010, at 20:00, [email protected] wrote:
> Send Magick-users mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://studio.imagemagick.org/mailman/listinfo/magick-users > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Magick-users digest..." > > > Today's Topics: > > 1. Re: Converting to a single-color image (duotone sans black > channel) (Anthony Thyssen) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 16 Jun 2010 10:22:44 +1000 > From: Anthony Thyssen <[email protected]> > Subject: Re: [magick-users] Converting to a single-color image > (duotone sans black channel) > To: IM User List <[email protected]> > Message-ID: <20100616102244.2bce6...@wraith> > Content-Type: text/plain; charset=US-ASCII > > > On Mon, 14 Jun 2010 21:17:11 -0700 > [email protected] wrote: > | >Hello, > | > > | >Apologies if I'm missing something obvious, I'm trying to work out > | >how to convert an image to a single colour - much like grayscale but > | >colorised. Effectively what I'm trying to do is replicate the effect > | >of Photoshop's Screen blending mode when the top layer is a solid > | >color. I've put up an example to compensate for my inability to > | >articulate this properly here: http://sho.ch/otterconvert.jpg > | > > | >I can do a duotone easily enough but this has me stumped. It would > | >also make my life notably easier if it was a single invocation of > | >convert. > | > > | >Any guidance would be greatly appreciated. > | > | > | see -tint and related techniques at > | http://www.imagemagick.org/Usage/color/#tinting > | > | also if you are on unix, see my script tintilize at > | http://www.fmwconcepts.com/imagemagick/index.php > | > | > | Fred > | > | > | P.S. On second thought after re-reviewing your example, a better > | method would appear to be > | > | +level-colors blue,white > | > | see http://www.imagemagick.org/Usage/color/#level-colors > > Note you should greyscale the image first then apply +level-colors > > Remember +level-colors is still a -level operator, just getting its > values (+level -> map black and white to given levels) from the colors > you have specified. each channel will still be modified individually. > > So use... > -colorspace Gray +level-colors blue,white > > You can also use -gamma afetr the -colorspace operator to adjust the > mid-tone brightness, if you want to. > > > > Anthony Thyssen ( System Programmer ) <[email protected]> > -------------------------------------------------------------------------- > Base 8 is just like base 10 really... > ...if you're missing two fingers. - Tom Lehrer > -------------------------------------------------------------------------- > Anthony's Castle http://www.cit.griffith.edu.au/~anthony/ > > > ------------------------------ > > _______________________________________________ > Magick-users mailing list > [email protected] > http://studio.imagemagick.org/mailman/listinfo/magick-users > > > End of Magick-users Digest, Vol 89, Issue 5 > ******************************************* _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
