How to write image

sim =reshape(sim,row,col,3);
gim =reshape(gim,row,col);
figure,
subplot(2,2,2),imshow(gim,[]),title('titl');
subplot(2,2,3),imshow(sim,[]),title('titl');

[Guillaume]

This snippet of code does not write any image to a file. It displays some images on screen.

From the conversation below, it's not clear if the question is about displaying images or saving them into a file. So, please clarify. A good question has words that clearly explain the problem, not just a title and a few lines of code.

In any case, for us to be able to help we need to know how the image is created (or loaded from file). What format it has (grayscale, rgb, indexed), what class (uint8, double, ...) and what range of intensities (0-1, 0-255, ...)

[Ajay kumar]

From this code I wanted to save into file .

From the script

gim =reshape(gim,row,col);

displays M*N double with intensity 0-255 Can you help in imwrite to gim

Answer 1

[KSSV]

doc imwrite https://in.mathworks.com/help/matlab/ref/imwrite.html

[Ajay kumar]

subplot(2,2,2),imshow(gim,[]),title('titl'); imwrite(gim,'g.png');

The image is blank white.

[KSSV]

does imshow show you a image?

[Ajay kumar]

imshow(gim,[]),

displays the image perfectly. While writing the image it stored in the location but, the image is blank white.

[KSSV]

black and white?? it is because you have to provide colormap to have it in color. Read the documentation dude.

[Ajay kumar]

I meant the saved image is 512*512 image with all pixel values 255= White image

For psedocolor images I got the image what i need. For grayscale image the saved image is complete White.

[Ajay kumar]

This is the image what i got

[Ajay kumar]

Sorry the image is complete white so its not visual

Answer 2

[Guillaume]

images of class double in matlab are assumed to have intensity range 0-1, with 0 == black, 1 == white.You get a white image because anything above 1 is the same as 1 == white. If your image is in the range 0-255 then its class should be uint8. So:

imwrite(uint8(gim), 'somename.png');

[Ajay kumar]

Great day, Thanks for your valuable comments.

I have tried as you commented here. Still the image is white.