Re: displaying an image

[Nicholas Jankowski]

On Wed, Sep 2, 2015 at 1:26 PM, lana frankle <address@hidden> wrote:

On Wed, Sep 2, 2015 at 9:00 AM, Nicholas Jankowski <address@hidden> wrote:

On Wed, Sep 2, 2015 at 10:39 AM, James Sherman Jr. <address@hidden> wrote:

On Tue, Sep 1, 2015 at 11:25 PM, lana frankle <address@hidden> wrote:
> Does Octave have the MATLAB function of displaying an image?  I'm trying toW

<snip>

 

P.S.  I just noticed that you image name is a bit ... odd.  Are you
sure that your image file has the suffix ".img"?  Usual suffixes are
.jpg, .jpeg, or .png.  I'm not familiar with the .img format, and I
wonder if that might be a typo.

.IMG is an image format, usually used by proprietary image generation routines. A quick google search turned up the following:
http://www.imageconverterplus.com/how-to-convert/img-jpg/

"There are several variations of the IMG format. It is not a universal format and depends on the software or device that created it. Originally the IMG format was designed for the GEM Paint Program. IMG can be a CD or a DVD mage file similar to an ISO file; it can be an archival format for floppy disks; an image generated by MAC, etc. Its characteristics vary as well, and depending on the format style it supports from 1 up to 24 bits per pixel. Since this image format is very diverse compatibility is the main issue involved. "

SO... it sounds like after getting used to finding and loading your image files, you might have to find a way to convert your image from the IMG format to something Octave can recognize.  I'm not even certain that Matlab can directly open an IMG file, since it seems to be a non-standard format.  Perhaps the system that produced the files also has available image conversion software available?

Nick J.

 

I tried a JPG first and when that didn't work, that's when I tried the IMG, because "IMG" was listed in the error message.

Please remember to copy the help list in the emails.

Anyway, the usage instructions just used IMG to stand for the name of your image file.

when you call help or doc, use a space between help or doc and the function you're looking for help on.  e.g.:

help imagesc

help imread

etc.

So, the first thing is to make sure that you are in the location of your image file so that Octave can find it. In Octave 4.0.0 with the graphical interface, there is a folder tree in the upper left hand corner. you can use that to navigate to your image files. You should see your file in that files/folders list when you are at the right place.  You can also use the command window to navigate, using CD to change directory and PWD to print the current working directory.

Once you're there, you can try imread. Octave will try to guess the filetype from the extension, so I would stick with JPG files first if that's what you have. the command should be:

>> imread('mousebrain.jpg')

'help imread'  will give you more options and parameters you can try to use.

Note, you should probably do some reading of the Octave help to get familiar with the basic operation and syntax. In the Octave 4.0.0 graphical interface, under the command window you should see tabs that say "Command Window" and "Documentation".  click on Documentation and you should be looking at the top level of the User Manual, where you can start with the Introduction and Getting started sections, and then jump around to other areas of interest.

Nick J.