Another possibility for a quick and dirty approximation to what you want, you may be able to use transparency of layers to blend together coloring from the different components, rather than manually mixing them beforehand. However, you would need to play with the palettes, and it couldn't be used directly for RGB with full brightness (even if we had the needed palettes).
.label.gii files could theoretically handle 2 billion labels, and our current implementation of .dlabel.nii (it uses float32 for all cifti files for simplicity) could theoretically handle 16 million without needing to start using non-consecutive integers, so these are well over the vertex counts of the surfaces (164k per hemisphere). However, large label tables might significantly slow down the coloring or label import code (it uses std::map, and I don't think it does any linear scans or text matching for the necessary operations, but we haven't tried abusing it this way). Tim On Wed, Dec 6, 2017 at 3:57 PM, Corina Melzer <[email protected]> wrote: > Thanks a lot for your responses. Label files might not be the perfect > solution for my problem, as the assigned colours are result of a color > mixing and are more of a continuous than a discrete character. Anyway, I > will try to approximate this using labels. Is there any kind of limitation > regarding the number of labels? > > Regards, > Corina > > > On 6. Dec 2017, at 22:00, Harwell, John <[email protected]> wrote: > > Hi Corina, > > At this time, Connectome Workbench is not able to display RGBA files. I > do not know when, or if, display of RGBA files will be added. > > As Matt Glasser indicated in his response, you may want to try using a > Label file. A label file contains integers where each value is an index > into a table of names. > > John Harwell > > On Dec 6, 2017, at 5:15 AM, Corina Melzer <[email protected]> wrote: > > Hi, > > I want to map some custom coloring to the triangles in wb_view and thought > of using the RGBA files for that. I created this RGBA file with nibabel > using values between [0,1]. > > gii_arr = gifti.GiftiDataArray(data=color_data,intent="NIFTI_ > INTENT_RGB_VECTOR") > gii_img = gifti.GiftiImage() > gii_img.add_gifti_data_array(gii_arr) > gifti.giftiio.write(gii_img, 'test.rgba.gii') > > When loading this file into wb_view, all faces are coloured blue instead > of the defined color codes. > > How is this file supposed to be formatted to show the defined coloring? Am > I getting the idea of this kind of file wrong? > > I also tested with an rgb file which has been provided for caret some time > ago (https://www.nitrc.org/forum/forum.php?offset=125&max_rows= > 25&style=flat&forum_id=281&thread_id=). The overlay is also just blue and > not as shown in their provided screenshot. > > [workbench version 1.2.3] > > Thanks for your help, > Corina > > > > > > > _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
