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HOW TO CHANGE MULTIPLE JPG TO PNG IMAGES

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ajith 2013-5-29

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评论： yasser 2021-4-19

采纳的回答： Azzi Abdelmalek

HOW TO CHANGE MULTIPLE JPG TO PNG IMAGES

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Walter Roberson 2013-6-13

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Please do not SHOUT.

ajith 2013-6-13

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sorry for my mistake and also clarify that. i only ask my doubt regards the program sir

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Azzi Abdelmalek 2013-5-29

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编辑：Azzi Abdelmalek 2013-5-29

在 MATLAB Online 中打开

f=dir('Yourfolder\*.jpg');
fil={f.name};  
for k=1:numel(fil)
  file=fil{k}
  new_file=strrep(file,'.jpg','.png')
  im=imread(file)
  imwrite(im,new_file)
end

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ajith 2013-6-13

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编辑：ajith 2013-6-13

but dimension is not reduced ie) 3 dimension matrix is not change into 2 dimension matrix

Walter Roberson 2013-6-13

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Yes? PNG does support 2D image formats, but it also supports 3D image formats.

ajith 2013-6-13

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i run this code after check the dimension of the png format it shows 200x200x3 i need it to make only 2 dimension only

Ryan Richardson 2016-10-5

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Worked great. Thanks!

D. Frank 2017-12-2

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can you explain me about this part: "imwrite(im,new_file)" -Matlab shows "Error using imwrite (line 454)"-

Walter Roberson 2017-12-2

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You would have an error if the file name you gave to write to is one that could not be opened.

D. Frank 2017-12-2

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Thank you, but when i want to show the "new_file" by code imshow(new_file), Matlab shows that "Error using images.internal.getImageFromFile Cannot find the specified file"

Walter Roberson 2017-12-2

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在 MATLAB Online 中打开

Example:

im = imread('cameraman.tif');
new_file = fullfile(tempdir(), 'test_image.png');
imwrite(im, new_file);
fprintf('The image was stored into file name: "%s"\n', new_file )
imshow(new_file)

Notice how I told it which directory to write into

Image Analyst 2017-12-2

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Duy, start a new question and attach your code so we don't spend/waste time guessing at what you have and how to fix it.

Tehmina Kakar 2018-7-16

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Thank You so much!! @Azzi Abdelmalek

Baz Mohammad 2018-11-24

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can you please make me clear part of the code

for k=1:nume1 (fil)

here "nume1" stands for what

Kostas 2018-11-24

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It is not "nume1" but numel

yasser 2021-4-19

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在 MATLAB Online 中打开

When I use your code I found that error

Error using strrep
Char inputs must be row vectors.

Are there any explanation?

regards

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