I am trying to save the image at an specific size.

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Atik Faysal 2021-1-7

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https://ww2.mathworks.cn/matlabcentral/answers/711143-i-am-trying-to-save-the-image-at-an-specific-size

评论： Image Analyst 2021-1-8

采纳的回答： Rik

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Here is the code I am doing:

[wt,f] = cwt(y,'amor',12000);
h = figure();
t = 0:numel(y)-1;
hp = pcolor(t,f,abs(wt));
hp.EdgeColor = 'none';
set(gca,'xtick',[],'ytick',[],'xticklabel',[],'yticklabel',[]);
exportgraphics(gca,'myplot.png','Resolution',300) 

I want to save the image at height and width of 224. How do I modify the resulotion value?

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采纳的回答

Rik 2021-1-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/711143-i-am-trying-to-save-the-image-at-an-specific-size#answer_593028

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The better way is to calculate the appropriate value.

However, you can also do this quick-n-dirty:

[wt,f] = cwt(y,'amor',12000);
h = figure();
t = 0:numel(y)-1;
hp = pcolor(t,f,abs(wt));
hp.EdgeColor = 'none';
set(gca,'xtick',[],'ytick',[],'xticklabel',[],'yticklabel',[]);
fn='myplot.png';R=300;
px_sz=[224 224];
exportgraphics(gca,fn,'Resolution',R);
im=imread(fn);
im=imresize(im,px_sz);
imwrite(im,fn);

Alternatively, you could also determine with what value you need to scale R to get your intended size in pixels. Note that this does not check if your image is square, so it may stretch your image.

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Atik Faysal 2021-1-8

在 MATLAB Online 中打开

I did not know that. Thank you for the info. However, I can not use imshow properly in my code. Would you care to show me how to do it?

[wt,f] = cwt(y,'amor',12000);
h = figure();
t = 0:numel(y)-1;
hp = pcolor(t,f,abs(wt));
hp.EdgeColor = 'none';
set(gca,'xtick',[],'ytick',[],'xticklabel',[],'yticklabel',[]);
fn='myplot.png';R=300;
px_sz=[224 224];
exportgraphics(gca,fn,'Resolution',R);
im=imread(fn);
im=imresize(im,px_sz);
imwrite(im,fn);