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

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qc C
qc C 2016-10-1
回答： qc C 2016-10-7
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.

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采纳的回答

qc C
qc C 2016-10-7
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.

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