如何在Matlab中保存图像

Question

I use the below command to display the image

imshow(img,[]);

when i use the following command to save the image it is saved as an empty white page

imsave;

how to save the image in this case any command would do

Answer 1

Convert image data into an actual image and try again:

h = image(img); %Convert to object
imsave(h); %Save image object

Notice that if you close the figure window generated by image() , the object is deleted and the handle has will point to nothing. Though this may be beyond of what you are asking for.

Hope this adjustment solved your problem

Answer 2

You are probably running into an issue with matrix type and range. If img is type double it needs to be scaled between 0 and 1.

A common issue is to load an image in uint8 (scaled between 0 and 255), convert to double in order to do some processing on it, without scaling, and then try and save it out. When you do that, MATLAB tries to convert back to uint8 , and any values in the image outside the [0 1] range are clipped. On many images this means that the file comes out all white.

To get around this, use functions like im2double and im2uint8 rather than just double or uint8 when converting images.

Try at the command line the difference between:

img = imread('pout.tif');
img = double(img);
imshow(img,[]);
imsave; 

and

img = imread('pout.tif');
img = im2double(img);
imshow(img,[]);
imsave; 

Answer 3

First convert the image to rgb using

img1=label2rgb(img);

then again convert the image into an gray image using

img2=rgb2gray(img1);

then u can use imshow to show the image and save it using imsave

imshow(img2);
imsave();