How to change width and height of image?

Question

andrew_cup 2012-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/54252-how-to-change-width-and-height-of-image

Hey, I'm trying to reduce the size of the height and width of an image only if the image width or height is over 400 pixels. Anybody know how I can do that? Here's the code:

im = imread('harry.jpg');

info = imfinfo('harry.jpg');

hoyde = info.Height;

bredde = info.Width;

if hoyde > 400 bredde > 400

    nyhoyde = hoyde/2;
    nybredde = bredde/2;
    [nyhoyde,nybredde,kanaler] = size(im);

end

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Answer 1

Image Analyst 2012-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/54252-how-to-change-width-and-height-of-image#answer_65912

在 MATLAB Online 中打开

Not sure I understand the language you used, but I'd do it like this:

reductionFactor = 0.5; % whatever...
[rows columns numberOfColorChannels] = size(im);
if rows>400 || columns > 400
  im = imresize(im, reductionFactor);
end

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andrew_cup 2012-11-20

Thank you! :-)

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Answer 2

Thomas 2012-11-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/54252-how-to-change-width-and-height-of-image#answer_65914

编辑：Thomas 2012-11-20

在 MATLAB Online 中打开

im = imread('harry.jpg');
info = imfinfo('harry.jpg');
hoyde = info.Height;
bredde = info.Width;
if hoyde > 400 ||  bredde > 400   %if rows or columns have more than 400px
     iq=imresize(im,0.5);   % reduce by factor 1/2=0.5
end
figure
imshow(im)    % actual image
figure
imshow(iq)    % reduced image