For data to be displayed on a logarithmic scale, we have had a small amount of discussion of doing the log transform on the fly, though considering that -*-math will do this easily with the main drawback being filesystem use, it hasn't been a priority. As for faking it with a log-scale palette, displaying a color bar of the palette would look rather strange, since the GUI wouldn't know it was supposed to be in log scale. You would also have to make sure that the minimum of the palette range is always 0, or else it would not display the way an actual log transform would.
As for discrete-valued data, I would recommend converting to a label file rather than using a palette to fake it, consider that a different total number of values would require a different palette to get independent control of each value's color. If you always have the same number of values with the same meaning, you can reuse the label text file after making it to your liking. If you just want a bunch of independent colors and don't care about anything else in the label table, the label import commands will give you random colors (which could be a good starting point using the label export table commands). Tim On Jun 12, 2015 12:11 PM, "Oscar Miranda Dominguez" <[email protected]> wrote: > Some times may be useful to show contrast in color when data has > non-regular or sharply skewed distributions. > > For example, if the data in the ciftis differs by one or 2 orders of > magnitude, I could calculate a specific color-map for this data set where > the spacing in the rgb-values would be in logarithmic scale instead of > linear scale. Then, I would not need to calculate the logarithm of the data > in the ciftis to have the same visual effect using the existing colormaps. > > A different case may arise if I would like to assign a specific color to > a set of rois or grayordinates that share the same value. Providing my > own-color map would avoid making a dlabel file, I guess. > > May be there ways with existing tools to deal with those 2 scenarios > > Thank you! > > ------------------------------ > *From:* Glasser, Matthew [[email protected]] > *Sent:* Friday, June 12, 2015 2:40 PM > *To:* Oscar Miranda Dominguez; [email protected] > *Subject:* Re: [HCP-Users] User-provided colormaps for wb_view? > > Not yet. What color map are you wanting to use? > > Peace, > > Matt. > > From: Oscar Miranda Dominguez <[email protected]> > Date: Friday, June 12, 2015 at 10:13 AM > To: "[email protected]" <[email protected]> > Subject: [HCP-Users] User-provided colormaps for wb_view? > > Hey > > I wonder whether letting wb_view load an user provided colormap is an > option coming in the newest release. > > Thanks! > > _______________________________________________ > HCP-Users mailing list > [email protected] > http://lists.humanconnectome.org/mailman/listinfo/hcp-users > > > ------------------------------ > > The materials in this message are private and may contain Protected > Healthcare Information or other information of a sensitive nature. If you > are not the intended recipient, be advised that any unauthorized use, > disclosure, copying or the taking of any action in reliance on the contents > of this information is strictly prohibited. If you have received this email > in error, please immediately notify the sender via telephone or return mail. > > _______________________________________________ > HCP-Users mailing list > [email protected] > http://lists.humanconnectome.org/mailman/listinfo/hcp-users > _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
