Please see below
On 10/3/07 12:13 PM, "Benjamin Ducke" <[EMAIL PROTECTED]> wrote: > [taking this over to the devel list] > > Parsing GRASS colour rules is very simple. It's all in the > GRASS Programmer's Manual. > > Full docs for CPT format are here: > > http://gmt.soest.hawaii.edu/gmt/doc/html/GMT_Docs/node58.html > > (section 4.15 of the GMT docs) > > Apparently, GMT supports HSV schemes, as well. > > QUESTIONS: > > 1. Does GRASS also support colour models other than RGB? GRASS color names (e.g., red, blue, yellow) > 2. Is '%" treated like a comment in the GRASS 'colr' files? It is treated like a percent. 0% black 50% red 100% green is translated as make the lowest (0%) value black and grade to red at the median value (50%), then continue to grade to blue to the highest value (100%) > 3. Is '#' as a comment indicator also OK in 'colr' files? I don't think this is accepted. But try and see. > 4. GMT also has labels for colour ranges. Would it be a good > idea to transfer those to the raster file (given that there > is no category labelling already or the user chooses to > overwrite it)? Not sure what you mean here. Replace the label value with the RBG value? Michael > > Benjamin > > Dylan Beaudette wrote: >> On Wednesday 03 October 2007, Benjamin Ducke wrote: >>> Good stuff >>> >>> All the palettes are available in GMT color format, which is just plain >>> ASCII and very similar to GRASS' own colour rule files in the 'cols' >>> database elements. The only major difference seems to be three >>> additional lines at the end of the file specifying colours for >>> foreground, background and no data areas which could simply be >>> discarded. >> >> Indeed. Will have to poke around in the r.colors source -- anyone an expert >> on >> how the rules file is parsed? >> >>> So how about adding an option cpt=filename to r.colors, to set the >>> color rules for a raster map from a GMT ASCII file? >> >> I think that this would be a great addition. The GMT folks might like it as >> well. >> >>> The best of these styles could still be hardcoded into r.colors' >>> database. >> >> Agreed. >> >>> Benjamin >>> >>> >>> P.S.: Some of these palettes actually have licenses attached to them. >>> What sort of a world do we live in that requires the most trivial >>> things to be licensed? Come on people, you can give _some_ things to >>> the public domain w/o conditions ... >> >> My thoughts exactly- however you are going to have to pay-up if you decide to >> implement this idea! j/k >> >> Dylan >> >>> Dylan Beaudette wrote: >>>> Sorry about those last two messages. My fingers where too fast for my >>>> brain, and inadvertently caused the keys ctrl-enter to be pressed (curse >>>> you Kmail!). >>>> >>>> What I had tried to mention was the collection of color palette files >>>> here: >>>> >>>> http://sview01.wiredworkplace.net/pub/cpt-city/ >>>> >>>> Perhaps we can convert a pile of these into GRASS-compatible color rules >>>> files. >>>> >>>> Cheers, >>>> >>>> Dylan >> >> >> __________________________________________ Michael Barton, Professor of Anthropology Director of Graduate Studies School of Human Evolution & Social Change Center for Social Dynamics & Complexity Arizona State University phone: 480-965-6213 fax: 480-965-7671 www: http://www.public.asu.edu/~cmbarton _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
