Matlab Imagesc Nan Black

Matlab Imagesc Nan Black. % add black as the first color. More answers (1) kelly kearney on 24 sep 2013.

MATLAB image processing technique Stack Overflow from stackoverflow.com

I displayed its values on a map. %set to rgb triple for desired color for inf values in this case black %denoted by [0 0 0]. However, my problem is that nan and zeros get dark blue color, and i'd like them to have no color at all, to be completely transparent.

Source: stackoverflow.com

R (r < 0.25) = nan;. You can set the alphadata of the image object to be equal to ~isnan (data) such that nan's will be shown as transparent values.

For Example, Create A 5X5 Matrix 'A' Containing Some Nan Values And Some '0'.

A = [1 2 nan; Aplt = nan (size (a)+1);. R (r < 0.25) = nan;.

More Answers (1) Kelly Kearney On 24 Sep 2013.

%set to rgb triple for desired color for inf values in this case black %denoted by [0 0 0]. % add black as the first color. It'll be a little tricky to do with imagesc, but you could get a similar result with pcolor:

To Write Matlab Image Data To Graphics Files, Use Imwrite.

% sample data infrgb = reshape([0 0 0],1,1,3); Chad greene on 24 jul 2017. I displayed its values on a map.

Helpful (0) This Can Be Done By Writing Code That Will Check For The Nan Values In The Image Matrix And Set It Black.

To read image data into matlab from graphics files in various standard formats, such as tiff, use imread. You can set the alphadata of the image object to be equal to ~isnan (data) such that nan's will be shown as transparent values. You can make the nans transparent and make the background axes black like this:

The Disadvantage Is That If You Use This Colormap To Display Data With No Nan Values, The Smallest Value Will Also.

Cmap = [ 0 0 0 ; However, my problem is that nan and zeros get dark blue color, and i'd like them to have no color at all, to be completely transparent.