Question

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.

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

Answer 1

Locking at your screen-shot, the x- and y-ticks are missing. They should appear in a standard-configuration of Matlab. Maybe something is just messed up in the Matlab-configuration. Try to do this with a clean new ~/.matlab folder (rename the old one before).

Alternatively … again judging by your screen-shot, this looks like Ubuntu/Unity in the background. Unity needs acceleration (OpenGL), which can be randomly buggy for some Linux graphics drivers. You may want to try to launch matlab in a “clean” X-server (maybe the twm environment) to rule this out.

Save the image as an (uncompressed) bitmap (bmp) and read it with imread. If the jpg is messed up by the imread-routine, this should rule this out.

Last but not least, broken copy of your jpg on your disk, some flipped bits. Run md5sums on your file’s copies.