how to save a plot without Margin of figure?

after using plot, i need save as figure. but saveas function incorporate margin of figure. how to save a plot without Margin of figure?

    clc; clear;
    mask = zeros(400,600);
    mask = logical(mask);
    position = [300,200];
    degree = 45;
    L = 50;
    x1 = position(1)+ (L*cosd(degree)) ; 
    y1 = position(2)+ (L*sind(degree)) ;

    figure,
    imshow(mask)
    hold on
    plot([position(1) x1],[position(2) y1],'w','LineWidth',8);
    %save plot in the form of image and display that
    saveas(gca,'mask22.jpg');
    img = imread('mask22.jpg');
    figure;
    imshow(img)

Answer 1

[OCDER]

This might help: https://www.mathworks.com/help/matlab/creating_plots/save-figure-with-minimal-white-space.html

Modify the code after you plot:

plot([position(1) x1],[position(2) y1],'w','LineWidth',8);

set(gca, 'units', 'normalized'); %Just making sure it's normalized
Tight = get(gca, 'TightInset');  %Gives you the bording spacing between plot box and any axis labels
                                 %[Left Bottom Right Top] spacing
NewPos = [Tight(1) Tight(2) 1-Tight(1)-Tight(3) 1-Tight(2)-Tight(4)]; %New plot position [X Y W H]
set(gca, 'Position', NewPos);

saveas(gca,'mask22.jpg');

[fred bnm]

just top and down is eliminate.but left and right is remain.

[OCDER]

Looks like imshow has its own definition of TightInset, which seems like a bug... Here's a workaround:

mask = zeros(400,600,'logical'); %<==You can do logical zeros here
position = [300,200];
degree = 45;
L = 50;
x1 = position(1)+ (L*cosd(degree)) ; 
y1 = position(2)+ (L*sind(degree)) ;
figure
Hx = imshow(mask);
set(gca, 'DataAspectRatioMode', 'auto')  %<== Need this to prevent unpredictable behavior, BUT you loose the aspect ratio of the original image!
hold on
plot([position(1) x1],[position(2) y1],'w','LineWidth',8);
hold off
set(gca, 'unit', 'normalize')
set(gca, 'position', [0 0 1 1]);
saveas(gca,'mask22.jpg');

[BN]

Thank you @OCDER, It solved my problem.

Answer 2

[mohsen Kondori]

Hi,

I have this error when use position in above codes. ERROR= (Undefined function 'position' for input arguments of type 'double'.)

how I can use it??

Thank you