Hi Hezekiah: > By "truecolor," I meant a photograph or similar image (MODIS visible > wavelength images in my case) plotted in the same colors perceived by > a human eye. The currently available plimage* functions plot colors > based on the magnitude or intensity of values.
OK > > The mem and memcairo drivers were my first thought for this. However, > I think it would be useful to have an RGBA image plotting function > included in PLplot for the following reasons: > - It would be simpler to, for example, use the same coordinate > transformations in each portion of a plot. This would include > consistent pixel -> plot coordinate mapping and 3D orientation of > images for 3D plots. > - Images could be used as layers other than the background, without > needing to do post-processing of the PLplot output > - The available PLplot output devices are available for "free." > - I may be wrong about this, but I think it would make the process > of using such images easier for users of PLplot in languages other > than C. These are good arguments for having image processing directly in plplot. The 'mem' drivers are just another option... > > Is there documentation available for the this use of the memcairo > driver? If I am unable to implement a function to do what I want then > this would still do a lot of what I need. > No new doc right now--I'm still working on getting memcairo to do alpha blending of the generated PLplot decoration with the user-supplied background. I guess the doc you would need would be a description of the image format to be passed in? This is documented under 'plsmem': http://plplot.sourceforge.net/docbook-manual/plplot-html-5.9.0/plsmem.html Regards, Doug > Thank you for the response! > > Hez > >> Regards, >> >> Doug >> On Wed, 12 Mar 2008, Hezekiah M. Carty wrote: >> >> > Are there currently plans to add either of truecolor image support >> > (photo as a plot background for example) or 3D oriented plimagefr >> > support? If not, and there is an interest in including such functions >> > in plplot, I would like to tackle those after getting the plimagefr >> > coordinate transformation support finalized. >> > >> > For the truecolor image support, my thought is to have a function >> > along the lines of: >> > void plimagergba( >> > PLFLT** r, PLFLT** g, PLFLT** b, PLFLT** a, >> > PLINT xdim, PLINT ydim, >> > PLFLT xmin, PLFLT xmax, PLFLT ymin, PLFLT ymax, >> > void (*pltr) (PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer), PLPointer >> > pltr_data) >> > with function arguments being used similarly to how plimage works. >> > With the r,g,b,a values separate, any image loading routines could be >> > handles on the user's end or at least abstracted on top of this. >> > >> > Is there a function like plfill (and/or plfill3) which can take a RGBA >> > color to plot? The plimage* functions use plfill internally. Or is >> > there a better, more plplot-like way to go about this? >> > >> > Thanks, >> > Hez > > -- > Hezekiah M. Carty > Graduate Research Assistant > University of Maryland > Department of Atmospheric and Oceanic Science > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
