how can I save an image which drawn line plot with original resolution？

Hello everyone,

I need some help on saving images. I displayed an image and plot some lines in a axes object. Then I want to save the image with lines without reducing resolution. what should I do?

I have tried some methods but did not meet my requirement. The original resolution of my image is 2448*2048.

    I=imread(imgpath);
    imshow(I);
    plot(x,y,'r-');
    ...
    imwrite(I, 'Image.tif');
    %This way I can save image with resolution of 2448*2048, but it did not contain lines I drew.

Then the second method still did not work.

    I=imread(imgpath);
    imshow(I);
    plot(x,y,'r-');
    ...
    F = getframe(hthandles.axes1);
    Image = frame2im(F);
    imwrite(Image, 'Image.tif');
    %This way I can save the picture of axes1. But it just like a screenshot and have a low resolution of 581*519.

The third method I tried.

     saveas(handles.axes1,'Image.jpg');
     %This way save the panel picture with a low resolution of 1200*900.

So,what should I do to save image and lines with original resolution. I don't want to loss any information of image.

Thank you.

Answer 1

[qc C]

I have solved this question by myself.

   I = imread(...);
   shape = [...];
   I = insertShape(I, 'Polygon', shape, 'Color', 'red');
   imwrite(I,'myimage.jpeg');
   %Also we can use insertMarker,inserText if we want to insert something into an image.