How to save an image using its URL

2014 10 16
2 个回答
回答已采纳
更新时间：2022 11 11
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0 个投票

I did this steps and it didn't worked!
url_img =
http://satelite.cptec.inpe.br/repositorio7/goes13_met10/goes13_met10_web/ams_afc_alta_jpg/2014/10/S11185873_201410150000.jpg
name_file_img =
20141015-00:00.jpg
>> urlwrite(url_img, name_file_img); Error using urlreadwrite>getFileOutputStream (line 245) Could not open output file "C:\Users\Albm\Documents\MATLAB\2014\10\15\2014\10\15\2014\10\15\2014\10\15\20141015-00:00.jpg".
Error in urlreadwrite (line 69) [file,outputStream] = getFileOutputStream(inputs.filename);
Error in urlwrite (line 38) [f,status] = urlreadwrite(mfilename,catchErrors,url,filename,varargin{:});

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 采纳的回答

matt dash
matt dash 2014-10-17

1 个投票

You just can't have a colon in a file name, that's all.

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Star Strider
Star Strider 2014-10-17
Good pick-up!
I completely overlooked that.
Arthur Melo
Arthur Melo 2014-10-17
Thanks everybody and sorry, but matt dash gave me the perfect answer, some times we forget too basics things. I don't know why. Thank you matt, now I have no problem.

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更多回答（1 个）

Image Analyst
Image Analyst 2014-10-17

0 个投票

You need to use imwrite() if you want to save an image, not urlwrite().

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Image Analyst
Image Analyst 2014-10-17
This code saves the image to my computer just fine for me. Does it work for you?
% Specify the filename (URL).
filename = 'http://satelite.cptec.inpe.br/repositorio7/goes13_met10/goes13_met10_web/ams_afc_alta_jpg/2014/10/S11185873_201410150000.jpg';
% Read it in to a variable in my m-file.
rgbImage = imread(filename);
% Display the image.
imshow(rgbImage);
% Save the image to a file on my local hard drive.
imwrite(rgbImage, 'satellite image.jpg');
Mykola Ponomarenko
Mykola Ponomarenko 2022-2-11
编辑：Mykola Ponomarenko 2022-2-11
In this example rgbImage is saved with additional lossess (with a re-compression). To save the original JPEG file one needs to use urlwrite function.
Image Analyst
Image Analyst 2022-2-11
@Mykola Ponomarenko
To get no additional losses, use PNG format
imwrite(rgbImage, 'satellite image.png');
Can you show an example of how you'd save your image array with urlwrite()? The documentation only shows how to save web pages as HTML format, not how to save image data in PNG format.

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