HOW TO CHANGE MULTIPLE JPG TO PNG IMAGES

HOW TO CHANGE MULTIPLE JPG TO PNG IMAGES

[Walter Roberson]

Please do not SHOUT.

[ajith]

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

Answer 1

[Azzi Abdelmalek]

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

[ajith]

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

[Walter Roberson]

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

[ajith]

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]

Worked great. Thanks!

[D. Frank]

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

[Walter Roberson]

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

[D. Frank]

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]

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]

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]

Thank You so much!! @Azzi Abdelmalek

[Baz Mohammad]

can you please make me clear part of the code

for k=1:nume1 (fil)

here "nume1" stands for what

[Kostas]

It is not "nume1" but numel

[yasser]

When I use your code I found that error

Error using strrep
Char inputs must be row vectors.

Are there any explanation?

regards