Matlab imshow() not showing the image properly

I have a simple code to show an image in Matlab. I use imread() to read it and imshow() to show it. the code it below, and the result in not shown properly. hope someone can help me.

img = imread('/home/samuelpedro/Desktop/API - Projecto/coimbra_aerea.jpg');
figure, imshow(img);

the resulting image is below.

the actual image is below

also, if i choose to save it to file as a new jpg it is saved correctly.

*UPDATE 1:

weirdly if i choose to show the axes in the preferences>image processing, it is corrected*

[Sean de Wolski]

Does the cameradude show correcly?

imshow(imread('cameraman.tif'));

Does the cameradude with color show correctly?

imshow(repmat(imread('cameraman.tif'),[1 1 3]));

[32sthide]

no, both are showed tiled as well.

[Sean de Wolski]

What is the output from:

which -all imshow

?

[32sthide]

/usr/local/MATLAB/R2012a/toolbox/images/imuitools/imshow.m

[32sthide]

the cameramen is showed well in the beginning but when i maximize the window it gets tiled.

[Sean de Wolski]

Is it just images displayed with imshow or is it all images?

imagesc(imread('cameraman.tif'))

[32sthide]

just imshow, imagesc works fine

[Sean de Wolski]

I would recommend contacting support.

[32sthide]

@Sean weirdly if i choose to show the axes in the preferences>image processing, it is corrected

[Lakshay Bhandari]

what does "if i choose to show the axes in the preferences>image processing, it is corrected" mean ?

[Walter Roberson]

There was an image processing preference as to whether the axes Visible property will be set or not. See iptsetprefs()

Answer 1

[Image Analyst]

It kind of looks like it's an interlaced file, like a PNG file that's interlaced, but the interlacing is not recognized. Any chance you could post the image so others could try it?

[Sean de Wolski]

@IA, he said the same thing happens with cameraman.

[32sthide]

it is the same with the camera man.

[Image Analyst]

OK - I wasn't sure if he meant that imagesc worked with his image but imshow didn't, or if that also applied to the cameraman image. It's certainly bizarre. I wonder if it would still be that way if he reinstalled. I'm pretty certain it wouldn't be that way on a different computer because no one else's has that problem. I'd also look at the "img" variable to see if maybe it was imread that created a corrupted image and imshow was correctly displaying it, or if img is fine and the problem lies with imshow. I'd also try zooming in and out to see if it was a repainting/refreshing/rendering issue or maybe some problem with the video adapter. If you zoom in and then out once and it looks fine, then imshow would be okay.

[32sthide]

i've reinstalled matlab once. it's the same. as you said, when I maximaze the window or xoom in / out the image is refreshing and the pattern changes.

[32sthide]

weirdly if i choose to show the axes in the preferences>image processing, it is corrected

Answer 2

[VENKATESAN]

Your path length looks very big. Don't use hyphen (-) symbol in your folders, instead u can use underscore. Try this.. Because there is a hyphen in your folder API-Projecto. But, it is better if you read the file from the work folder and the imshow will be perfect.

Try this

img = imread('/home/samuelpedro/Desktop/API_Projecto/coimbra_aerea.jpg'); figure, imshow(img);

or the other one

img=imread('coimbra_aerea.jpg'); figure, imshow(img); imwrite(img, 'coimbra_aerea.jpg', 'jpg');

[32sthide]

i've tried even something like:

cd /home/samuelpedro/Desktop/APIProject/

close all
clear all
clc

img = imread('coimbra_aerea.jpg');
figure, imshow(img);

[Sean de Wolski]

This won't matter. I would guess it is some graphics driver isolated specifically to your machine.

Answer 3

[UJJWAL]

I would really request you to post the image file so that others could also try it.

[32sthide]

it's not a problem from the image. all my imshow no matter the files is the same.