MATLAB: Saved histogram figures appears blank after I open them.

figurehistogramimage processingplottingsave

Hi,I have this code
%function hst(v,h,m)
ve=imread('v.png');
he=imread('h.png');
m=imread('i.png');
vr=ve(:,:,1);
imhist(ve(:,:,1))
title('Red Channel Histogram of vertical')
saveas(gcf,'RCV.png');
figure
vg=ve(:,:,2);
imhist(ve(:,:,2))
title('Green Channel Histogram of vertical')
saveas(gcf,'GCV.png')
figure
vb=ve(:,:,3);
imhist(ve(:,:,3))
title('Blue Channel Histogram of vertical')
figure
saveas(gcf,'BCV.png');
hr=he(:,:,1);
imhist(he(:,:,1))
title('Red Channel Histogram of horizontal')
figure
saveas(gcf,'RCH.png');
hg=he(:,:,2);
imhist(he(:,:,2))
title('Green Channel Histogram of horizontal')
figure
saveas(gcf,'GCH.png');
hb=he(:,:,3);
imhist(he(:,:,3))
title('Blue Channel Histogram of horizontal')
figure
saveas(gcf,'BCH.png');
mr=m(:,:,1);
imhist(m(:,:,1))
title('Red Channel Histogram of Intersection ')
figure
saveas(gcf,'RCI.png');
mg=m(:,:,2);
imhist(m(:,:,2))
title('Green Channel Histogram of Intersection')
figure
saveas(gcf,'GCI.png');
mb=m(:,:,3);
imhist(m(:,:,3))
title('Blue Channel Histogram of Intersection ')
saveas(gcf,'BCI.png');
In this, I am trying to find histograms of RGB channels of different images and then save them.When I run the code the histograms appear but when I open the saved images of histograms most of them give a blank figure and I can't understand why?
Can someone help me with this, please?
I have also attached the images I am using in the code.

Best Answer

Of course the saved figure are blank, if you use this code:
figure
saveas(gcf,'RCI.png');   % <-- Not here
mg=m(:,:,2);
imhist(m(:,:,2))
title('Green Channel Histogram of Intersection')
% <-- but save here!
This opens a new figure, saves the contents and create the histogram afterwards. You have to call saveas after the contents of the figure is drawn.
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