Undocumented Matlab
  • SERVICES
    • Consulting
    • Development
    • Training
    • Gallery
    • Testimonials
  • PRODUCTS
    • IQML: IQFeed-Matlab connector
    • IB-Matlab: InteractiveBrokers-Matlab connector
    • EODML: EODHistoricalData-Matlab connector
    • Webinars
  • BOOKS
    • Secrets of MATLAB-Java Programming
    • Accelerating MATLAB Performance
    • MATLAB Succinctly
  • ARTICLES
  • ABOUT
    • Policies
  • CONTACT
  • SERVICES
    • Consulting
    • Development
    • Training
    • Gallery
    • Testimonials
  • PRODUCTS
    • IQML: IQFeed-Matlab connector
    • IB-Matlab: InteractiveBrokers-Matlab connector
    • EODML: EODHistoricalData-Matlab connector
    • Webinars
  • BOOKS
    • Secrets of MATLAB-Java Programming
    • Accelerating MATLAB Performance
    • MATLAB Succinctly
  • ARTICLES
  • ABOUT
    • Policies
  • CONTACT

Image Easter egg

April 6, 2010 2 Comments

Last year I presented the Matlab Spy Easter egg for the 2009 Easter holiday. This year, slightly late, I present another Easter egg in the well-known image function: When we run image with no input arguments, we get a default image of an inverted boy:

image;

image;

Default image
Default image

To see the image right-side up:

image;
colormap(gray(32));
axis ij image off

image; colormap(gray(32)); axis ij image off

Corrected default image
Corrected default image

In fact, it turns out that there are quite a few hidden super-imposed images here, and that there is an interesting story behind them, which was explained by Steve Eddins in his Image Processing blog. For those interested, the boy above is Steve’s eldest, but that’s only a small part of the story…
Happy Holiday!
Yair
p.s. – The default image has not changed in many years. I guess the boy should be in high school or college by now. Perhaps it’s time to post an updated picture in the R2010b release, Steve?

Related posts:

  1. Spy Easter egg – The built-in Matlab function spy has an undocumented feature (Easter egg) when it is called with no input arguments....
  2. Spy Easter egg take 2 – The default spy Easter-egg image in the spy function has recently changed. ...
  3. Auto-scale image colors – Images can be automatically color-scaled for maximum resolution, using the undocumented MarkedClean event. ...
  4. Plot legend title – Titles to plot legends are easy to achieve in HG1 (R2014a or earlier), but much more difficult in HG2 (R2014b or newer). ...
  5. Customizing axes part 2 – Matlab HG2 axes can be customized in many different ways. This article explains some of the undocumented aspects. ...
  6. FIG files format – FIG files are actually MAT files in disguise. This article explains how this can be useful in Matlab applications....
Easter egg image Pure Matlab Undocumented feature
Print Print
« Previous
Next »
2 Responses
  1. Steve Eddins April 6, 2010 at 11:30 Reply

    Almost college.

    Yes, it probably is time to change the image. But if it happens, I won’t be the one to do it this time. 🙂

  2. Rafael April 6, 2010 at 13:44 Reply

    Funny thing… I was just reading this yesterday in his blog, and now you post it here!

Leave a Reply
HTML tags such as <b> or <i> are accepted.
Wrap code fragments inside <pre lang="matlab"> tags, like this:
<pre lang="matlab">
a = magic(3);
disp(sum(a))
</pre>
I reserve the right to edit/delete comments (read the site policies).
Not all comments will be answered. You can always email me (altmany at gmail) for private consulting.

Click here to cancel reply.

Useful links
  •  Email Yair Altman
  •  Subscribe to new posts (email)
  •  Subscribe to new posts (feed)
  •  Subscribe to new posts (reader)
  •  Subscribe to comments (feed)
 
Accelerating MATLAB Performance book
Recent Posts

Speeding-up builtin Matlab functions – part 3

Improving graphics interactivity

Interesting Matlab puzzle – analysis

Interesting Matlab puzzle

Undocumented plot marker types

Matlab toolstrip – part 9 (popup figures)

Matlab toolstrip – part 8 (galleries)

Matlab toolstrip – part 7 (selection controls)

Matlab toolstrip – part 6 (complex controls)

Matlab toolstrip – part 5 (icons)

Matlab toolstrip – part 4 (control customization)

Reverting axes controls in figure toolbar

Matlab toolstrip – part 3 (basic customization)

Matlab toolstrip – part 2 (ToolGroup App)

Matlab toolstrip – part 1

Categories
  • Desktop (45)
  • Figure window (59)
  • Guest bloggers (65)
  • GUI (165)
  • Handle graphics (84)
  • Hidden property (42)
  • Icons (15)
  • Java (174)
  • Listeners (22)
  • Memory (16)
  • Mex (13)
  • Presumed future risk (394)
    • High risk of breaking in future versions (100)
    • Low risk of breaking in future versions (160)
    • Medium risk of breaking in future versions (136)
  • Public presentation (6)
  • Semi-documented feature (10)
  • Semi-documented function (35)
  • Stock Matlab function (140)
  • Toolbox (10)
  • UI controls (52)
  • Uncategorized (13)
  • Undocumented feature (217)
  • Undocumented function (37)
Tags
ActiveX (6) AppDesigner (9) Callbacks (31) Compiler (10) Desktop (38) Donn Shull (10) Editor (8) Figure (19) FindJObj (27) GUI (141) GUIDE (8) Handle graphics (78) HG2 (34) Hidden property (51) HTML (26) Icons (9) Internal component (39) Java (178) JavaFrame (20) JIDE (19) JMI (8) Listener (17) Malcolm Lidierth (8) MCOS (11) Memory (13) Menubar (9) Mex (14) Optical illusion (11) Performance (78) Profiler (9) Pure Matlab (187) schema (7) schema.class (8) schema.prop (18) Semi-documented feature (6) Semi-documented function (33) Toolbar (14) Toolstrip (13) uicontrol (37) uifigure (8) UIInspect (12) uitools (20) Undocumented feature (187) Undocumented function (37) Undocumented property (20)
Recent Comments
  • Iñigo (2 days 2 hours ago): Thanks Yair. I didn’t realize it was posted just above. It would be great to know about a solution soon
  • Yair Altman (3 days 9 hours ago): @Iñigo – your query is related to Seth’s question above. We can access the currently-browsed URL in JavaScript (for example: jBrowserPanel.executeScript...
  • Iñigo (5 days 1 hour ago): I am looking for setting a UI that allows following process: opening a web site, navigate inside this web site and at some specific moments (i.e. when the figure is closed or a button...
  • Nicholas (12 days 7 hours ago): Yair, this works wonderfully! I can’t thank you enough!
  • Collin (14 days 10 hours ago): Seth Good point, I am using 2022b, mathworks seems to have started using CEF browsers from 2019a, best I can tell. take a look at the package com.mathworks.toolbox.matla...
  • Seth (15 days 2 hours ago): Collin, What version of MATLAB are you using?
  • Collin (20 days 9 hours ago): Seth, I have had some success executing javascript that requires no return value by executing it directly (sort of) on the org.cef.browser.CefBrowser that a...
  • Coo Coo (22 days 4 hours ago): FFT-based convolution is circular whereas MATLAB’s conv functions have several options (‘valid’, ‘same’, ‘full’) but unfortunately not...
  • Seth (22 days 7 hours ago): No luck with removing the space.
  • Seth (22 days 8 hours ago): The javascript code works fine running the application from the 2019b desktop version and the 2016b deployed version.
  • Seth (22 days 8 hours ago): I have been using this browser functionality in 2016b because it works fully in deployed applications in that version. However, because of Java 7 being flagged as a security risk, I...
  • Yair Altman (22 days 8 hours ago): I’ve never tested javascript callbacks, but perhaps you should try removing the extra space after the “matlab:” protocol specifier. Does it make any difference?
  • Seth (22 days 9 hours ago): I have been using this functionality in 2016b since it works in deployed applications and have not had a reason to need to upgrade but with java 7 being flagged as a security risk I am...
  • KEVIN (42 days 10 hours ago): I apologize, I intended my response to fall under ‘T’ but did not seem to work. I was referring to the bit of code posted by ‘T’ regarding the toolgroup and...
  • Yair Altman (42 days 10 hours ago): It is not clear from your comment which code exactly you are referring to and what you see differently in 19b vs. 20b, so I cannot assist with your specific query. In general I...
Contact us
Undocumented Matlab © 2009 - Yair Altman
This website and Octahedron Ltd. are not affiliated with The MathWorks Inc.; MATLAB® is a registered trademark of The MathWorks Inc.
Scroll to top