How to change width and height of image?

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andrew_cup
andrew_cup 2012-11-20
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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采纳的回答

Image Analyst
Image Analyst 2012-11-20
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

更多回答（1 个）

Thomas
Thomas 2012-11-20
编辑：Thomas 2012-11-20
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

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