Save- path for image using the function "imwrite()"

Hi

when I use the imshow() function, I know that I have the image that I want to display in one of the files in the *MATLAB path.

For instance, when I take a picture with my webcam, I want to save it by using imwrite.

where has the image been written to?

Matar Maoz

Answer 1

[Walter Roberson]

The image gets written to the current directory by default. You can specify an explicit path when you imwrite()

[matar maoz]

thanks. i the file, but I still can't use it for later in the code.

for example, I want to imread() the picture

X = imread('squmatar3.png');

but I get:

*File "squmatar3.png" does not exist.*

if it is in the current directory, why can't I imread() or imshow() it ?

MATAR MAOZ

[Jan]

If the file exists in the current directory, IMREAD *can* read it. Please check: "exist('squmatar3.png', 'file')".

[Walter Roberson]

Sounds like you may have switched directories between.

Answer 2

[Jan]

IMWRITE writes to the current folder, so these two commands are equivalent:

image = rand(100, 100, 3);
imwrite(image, 'File.png')
imwrite(image, fullfile(cd, 'File.png'))

The later method can be used to specifiy the wanted directory.

[matar maoz]

I don't know if the syntax is correct for the second row, because i get an error:

*??? Error using ==> imwrite at 363

Too few input arguments*

I also didnt find anything in the help about it.

I'd be glad to get a bit more help :)

Matar Maoz

[Walter Roberson]

imwrite() needs the first argument to be the image matrix to write.

[Jan]

I've inserted [image] in the example. To get help about IMWRITE, type "help imwrite".

[ayushi]

suppose if we want to check that if in a variable "R" some image exist like "Image1" then imshow(image2) how to do this?

[Walter Roberson]

if ~isempty(R) && ndims(R) < 4 && (isnumeric(R) || islogical(R))
   disp('R contains an image');
end

Or did you mean that R contains the name of a file that contains an image?

if exist(R, 'file')
  try
    imfinfo(R);
    %if we got here then R does name an image. So for some reason now we are supposed to display a different image
    imshow(image2);
  catch
    %R names a file that is not an image
  end
else
   %R does not name a file
end