size of image file

hi. I want to ask about: how can we get the size of an image file (in Byte/kByte)? Because i want to put it in the edit box/text. thanks.

Answer 1

[Walter Roberson]

Use dir() and look at the "size" field that is returned; that will be in bytes.

[Ju]

Sorry, i don't get it by using dir().

i make an application using GUI matlab. When i press button, the textbox will show the size.

Can you tell me another option?

[Walter Roberson]

The other options are much worse to write, and are not portable.

fileinfo = dir(ImageFileName);

filesize = fileinfo(1).size;

[Ju]

sorry for bothering you again.

but there's an error, it says: "dir is not defined for 'uint8' input"

what does it mean? and how can i fix it?

thanks a lot.

[Jan]

@Walter, a small typo: filesize = fileinfo(1).bytes, not ".size".

Answer 2

[Jan]

 "dir is not defined for 'uint8' input"

This mean that you call DIR with an UINT8 variable like:

a = uint8(rand(10));
b = dir(a);

I assume you read an image file into a variable and use this variable instead of the filename afterwards.

A general recommendation: It is efficient to post the code, which causes the problem, and the complete error message. Then assisting is easier and efficient.

[Ju]

this is my code:

[fileName,pathName] = uigetfile({'*.gif','Animated GIF FIle{*.gif}'},'Open File');

[imageFile map] = imread(fullfile(pathName,fileName),'frames','all');

temp = imageFile;

fileInfo = dir(temp);

fileSize = fileInfo(1).size;

set(handles.edit1,'String',num2str(fileSize));

can you tell me what's wrong with that?