How to save/print multiples images using a for loop?

Question

Beatriz Sanchez 2019-2-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/442728-how-to-save-print-multiples-images-using-a-for-loop

评论： Beatriz Sanchez 2019-2-7

Hello,

so, I'm loading some files within a for loop and I want to print a image for each iteration of the for loop:

folder= dir ('*.mat')
  for id=1:length (folder)
load (folder(id).name) %this load the files one by one so I can create an image for each iteration
for ix= 1:rep
        hold on
        scatter (vec, x_mean(ix, :, 1),'b','filled')
        scatter (vec, x_mean(ix, :, 2),'r', 'filled') 
   
        plot (vec, rep_prom1,'b')
        plot (vec, rep_prom2, 'r')
    hold off
    set (gca, 'Xtick', vec, 'Xticklabel', vec)
     %the lines above create de image that I want for each file
     %whit this I espect to get as many images as files loaded, I use 'strcat' and 'num2str' so I can save the images with differents names for each
    print(strcat('Densidades Promedio. ', ' Alpha=' ,num2str(alfa), '. p=', num2str(p), '.'), '-dpng') 
    
end
  end

But when I run this code, matlab give me only one image with all of the files on it, and save multiples files with the names saved correctly, but this files are damaged and I can't open them. Any idea how can I do this?

thank you very much beforehand

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Answer 1

KALYAN ACHARJYA 2019-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/442728-how-to-save-print-multiples-images-using-a-for-loop#answer_359148

在 MATLAB Online 中打开

As you mentioned that you have already read the images using for loop.

Syntax code as follows

for k=1:k  %k be numbers of images in the folder
%supoose you do the computation on images one by one and each iteration you need to save the image
%say result image name as result1
destination='D:\Kalyan Works\Matlab Work\od_region_grow_DRIONS\im'; %Complete path to save images
%here 'od_region_grow_DRIONS' folder name and im initial file name of save images in that folder
%save images as im1.png, im2.png etc
imwrite(result1,[destination,num2str(k),'.png']);
end 

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Image Analyst 2019-2-7

You said "print" - do you want to have your code print them immediately on paper in a printer?

You also said plot. What does it mean to "plot" an image (like a graph)??? Do you mean "display"?

Do you want to

plot
print
display
save to disk

the image?

Beatriz Sanchez 2019-2-7

thank you very much for your answer. I solved my problem, I think I didn't explain it too well. I wanted to:

load files
plot each file
print each image on a .png file with different names

It turns out that one can't use dot '.' on the funtion 'print'. Remove the dots and add 'figure (id)' before the second for loop solved the error. :-)

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