Error using imwrite with variable filename in for loop

Question

Zane Peterkovic 2021-5-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/820075-error-using-imwrite-with-variable-filename-in-for-loop

评论： Stephen23 2021-5-3

I'm trying to make a fairly simple programme to convert a batch of images to grayscale and save them in my current folder.

Convert = fullfile('225C');
imds = imageDatastore(Convert);
for i = 1:149
    img = readimage(imds,i);
    img = rgb2gray(img);
    imwrite(img,[i,'.png']);
end

However, when I run this code I get the error 'Unable to open file ".png" for writing. You might not have write permission.'

Through other forumposts I was lead to believe this should be the correct syntax for a variable filename. I just want 149 files numbered 1-149. Any help appreciated.