Create real colorbar pictures

There is a picture and I would like to create a real color bar, where yellow will be the maximum and white the minimum.

clc; close all ; clear all
[fileName1,path,indx] = uigetfile('*.png');
fileName=fullfile(path,fileName1);
fileName
I=imread(fileName) 
imshow(I) 

thanks in advance

Answer 1

[KSSV]

You can make your colormap using the RGB color code values. Check the below example.

y = [255 255 0]/255 ; % yello RGB value
w = [255 255 255]/255 ;  % white RGB value 
n = 10 ;   % number of variations, can be changed 
cmap = [linspace(w(1),y(1),n)' linspace(w(2),y(2),n)' linspace(w(3),y(3),n)'] ; 
% USe colormap 
Z = peaks(100) ;
surf(Z)
shading interp 
colormap(cmap)
colorbar