Saved histogram figures appears blank after I open them.

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.

[Jan]

Please post your code in a compact form: Use the "{} Code" button and no blank line after each line of code. Thanks.

Answer 1

[Jan]

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.

[Prachi Sharma]

Thanks a lot.I didn't realize that I have messed up the position of saveas.