Matlab: Plot colourful line over background gray image whilst retaining colorbar information

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votes

I am using MATLAB I would like to plot a colourful trajectory on top of a grayscale png image whilst retaining the colour information of the trajectory. For example with the data below, I would like to plot Data B over Image A. Without Data B turning gray and without making the colourbar represent the grayscaled image. Any help would be greatly appreciated!

%Image A
RGB = imread('peppers.png');
I = rgb2gray(RGB);
figure
imshow(I)

hold on

%Data B
x = 1:1000; 
y = x;
z = zeros(size(x));
lineColor = x; 
surface([x;x], [y;y], [z;z], [lineColor;lineColor],...
    'FaceColor', 'no',...
    'EdgeColor', 'interp',...
    'LineWidth', 8);
cc = colorbar();

Many thanks!

matlabplotpngcolorbar