Save image in specific resolution in Matlab

Question

I\'m trying for hours to simply output a certain plot in a specific resolution (320x240).

  xmax = 320; ymax = 240;
  xmin = 0; ymin = 0;
  figure;
  set(gcf         


        

Answer 1

Possible solution is converting figure to image, and use imresize.

Fixing the figure position to match 320x240 resolution is possible, but using imresize is simpler (I think).

The following code sample, convert figure to image, and use imrezie to set resolution to 320x240:

figure;
% xmax = 320; ymax = 240;
% xmin = 0; ymin = 0;  
% set(gcf,'position',[1060 860 320 240]);
% axis([xmin,xmax,ymin,ymax]);

plot(sin(-pi:0.01:pi)); %Example figure
I = frame2im(getframe(gcf)); %Convert plot to image (true color RGB matrix).
J = imresize(I, [240, 320], 'bicubic'); %Resize image to resolution 320x240
imwrite(J, 'J.jpg'); %Save image to file

Answer 2

There's an easier solution for this.

Saying you have your figure, gcf, you capture the frame and just use imresize to edit the object property cdata of your frame.

frame = getframe(gcf);
frame.cdata = imresize(frame.cdata,[240, 320]);

Then you can write your video using this frame, which now has the assigned resolution.

writeVideo(VideoObj,frame);

It works quite well.