why does whiteness show up ? !

I saved an image in my file using "saveas" and I have used those instructions

DirectoryPath =('C:\Users\Mayssa\Desktop\pfe\Matlab\interface');
whereToStore=fullfile(DirectoryPath,a);
saveas(gcf, whereToStore);

But when I try to read it (with imread) it shows up on a a white background, how can I get rid of it ? :(

Answer 1

[Star Strider]

From the saveas documentation:

• If you do not specify an extension, then saveas saves the figure to a FIG-file.

Instead of imread, see if openfig works.

[Mayssa]

I did specify an extension , it's png. I need imread because I have to use the image for other purposes, however, I can not affect openfig to a variable.

[Star Strider]

This works for me:

figure(1)
plot(-10:10, exp(-([-10:10]/5).^2))
saveas(gcf, '#TestSAVEAS.png');
A = imread('#TestSAVEAS.png');
figure(2)
image(A)

[Image Analyst]

Well, what is in the string badly-named "a"? It is a string, isn't it?

[Mayssa]

it's a variable to which I affect the time of saving (clock) followed by the extension png

c = clock;

 a=['MicroCercle','_',num2str(c(2)),'_',num2str(c(3)),'_',num2str(c(4)),'h',num2str(c(5)),'m',num2str(c(5)),'.png'];

[Mayssa]

@Star Strider, It does work for me too, but in my code I am plotting over an image texture than saving the whole in another image.

[Star Strider]

Try this:

figure(1)
plot(-10:10, exp(-([-10:10]/5).^2))
saveas(gcf, '#TestSAVEAS_01.png');
figure(2)
plot(-10:10, 1-exp(-([-10:10]/5).^2))
saveas(gcf, '#TestSAVEAS_02.png');
A = imread('#TestSAVEAS_01.png');
B = imread('#TestSAVEAS_02.png');
figure(2)
image(uint8((double(A)/2 + double(B)/2)))
hold on
hold off
title('Retrieved & Combined Images')
delete('#TestSAVEAS_01.png')
delete('#TestSAVEAS_02.png')

Answer 2

[Walter Roberson]

http://www.mathworks.com/help/matlab/ref/figure-properties.html#property_inverthardcopy

Answer 3

[Image Analyst]

See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_save_my_figure.2C_axes.2C_or_image.3F_I.27m_having_trouble_with_the_built_in_MATLAB_functions.