User talk:Lookang

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Welcome to Wikimedia Commons, Lookang!
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Tip: Categorizing images[edit]

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Hello, Lookang!
Tip: Add categories to your files
Tip: Add categories to your files

Thanks a lot for contributing to the Wikimedia Commons! Here's a tip to make your uploads more useful: Why not add some categories to describe them? This will help more people to find and use them.

Here's how:

1) If you're using the UploadWizard, you can add categories to each file when you describe it. Just click "more options" for the file and add the categories which make sense:

2) You can also pick the file from your list of uploads, edit the file description page, and manually add the category code at the end of the page.

[[Category:Category name]]

For example, if you are uploading a diagram showing the orbits of comets, you add the following code:

[[Category:Astronomical diagrams]]
[[Category:Comets]]

This will make the diagram show up in the categories "Astronomical diagrams" and "Comets".

When picking categories, try to choose a specific category ("Astronomical diagrams") over a generic one ("Illustrations").

Thanks again for your uploads! More information about categorization can be found in Commons:Categories, and don't hesitate to leave a note on the help desk.

BotMultichillT 06:01, 23 October 2009 (UTC)[reply]

Java applets[edit]

I was greatly impressed by your micrometer and ruler applets and would like to host them on my website. Unfortunately the links you provide are dead. When possible, could you please drop message for me where could I get the applets. I would need a source code as well under any Free license of your choice. Audriusa (talk) 12:27, 18 July 2010 (UTC)[reply]

Re: how did you make the animations in the thumbnails as well?[edit]

Hi! You're probably talking about this picture: File:2C-F animation.gif. That's not my work and I didn't draw it - I only transerred it from en.wikipedia. And about your problem: I never had problems with animated pictures - every picture which I ever used in articles in Wikipedia worked and works fine - but I heard from someone from Polish Wikipedia that it depends on thumbnail size. I can only advise you to try to change the size of your thumbnail and watch if it works. I will also try to find the discussion on problem with animated picture on Polish Wikipedia, and if I find it, I will translate it for you. Regards, ∼Wostr (talk) 09:47, 20 June 2011 (UTC)[reply]

File:Singapore 2011 majulah.gif[edit]

Pay attention to copyright
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— Cheers, JackLee –talk– 19:44, 28 August 2011 (UTC)[reply]

Animations of simulation like File:Gravitational potential.gif[edit]

Hello Lookang

Are you aware that actually this simulation is wrong? And this should not be the case for something used on an article page like en:Gravity well - should it? ;) Greetings --DrTrigon (talk) 13:39, 14 December 2011 (UTC)[reply]

In fact I there are 2 animations:
that are partly wrong and thus not yet in a state appropriate for Wikpedia. I tried to fix them, but got very confused in the end, since it seams to me that the potential plots from those two animations got swapped or something else. The best now would be to re-create those animations from scratch, verify them very well and then upload to replace to old ones!!
Meanwhile I remove all those animations from wikipedia pages!
Greetings --DrTrigon (talk) 09:55, 19 January 2012 (UTC)[reply]

Source of derivative work is not properly indicated: File:Eratosthenes.png[edit]

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Warning sign
This file may be deleted.
A file that you have uploaded to Wikimedia Commons, File:Eratosthenes.png, is a derivative work, containing an "image within an image". Examples of such works would include a photograph of a sculpture, a scan of a magazine cover, or a map that has been altered from the original. In each of these cases, the rights of the creator of the original must be considered, as well as those of the creator of the derivative work.

While the description page states who made this derivative work, it currently doesn't specify who created the original work, so the overall copyright status is unclear. If you did not create the original work depicted in this image, you will need to specify the owner of the copyright.

Please edit the file description and add the missing information, or the file may be deleted. If you created the original content yourself, enter this information as the source. If someone else created the content, the source should be the address to the web page where you found it, the name and ISBN of the book you scanned it from, or similar. You should also name the author, provide verifiable information to show that the content is in the public domain or has been published under a free license by its author, and add an appropriate template identifying the public domain or licensing status, if you have not already done so. Please add the required information for this and other files you have uploaded before adding more files. If you need assistance, please ask at the help desk. Thank you!

Saibo (Δ∇) 02:37, 22 June 2012 (UTC)[reply]

Hallo Lookang, please add the source of the sat/earth images. --Saibo (Δ∇) 02:38, 22 June 2012 (UTC)[reply]

done! Source Own work http://weelookang.blogspot.sg/2012/06/ejs-open-source-eratosthenes-measures.html Picture is from Google Earth http://www.google.com/earth/index.html Author Lookang many thanks to author of original simulation = Todd K. Timberlake author of Easy Java Simulation = Francisco Esquembre

Hallo Lookang, thanks. But we have a problem then: Google products are (to my best knowledge) not public domain or freely licensed. Also see Commons:Screenshots and COM:DW. Do you have a specific reason to assume that you can use this screenshot from google earth? Cheers --Saibo (Δ∇) 14:50, 22 June 2012 (UTC)[reply]

Monday will redo the picture of earth using public domain photo :)

Done! Picture is from http://www.shadedrelief.com/natural3/pages/textures.html // who release it to the public domain by Tom Patterson, www.shadedrelief.com.

Thanks, I think that is okay (I made some final changes to the file page). Tom Patterson used some images of NASA (blue marble and SRTM) but as far as I know that is public domain too. --Saibo (Δ∇) 15:41, 25 June 2012 (UTC)[reply]
I saw you wrote "quality reduce" - please just upload the highest possible quality. It gets scaled down automatically by the servers. In case of png file type you need to upload a reduced version (as a new file version) if the original exceeds 12,500,000 pixels (width×height). --Saibo (Δ∇) 15:47, 25 June 2012 (UTC)[reply]

A correction request for File:Huygens Fresnel Principle.gif[edit]

Hi, Lookang. I happened across this animation you'd made to illustrate the Huygens–Fresnel principle. While it's generally very nice, it seems to depict an unphysically high amplitude of outgoing waves at high angles of refraction (near 90°). This is presumably because the distance between the secondary source points is too large compared to the wavelength, causing the secondary waves to interfere constructively at angles where they properly shouldn't.

Could you please remake and reupload the animation with more source points, a longer wavelength and/or a slightly narrower slit? I played around with your applet a bit, and it looks like just increasing the wavelength to 0.20 and/or adding one more source point should (mostly) fix it.

Thanks, --Ilmari Karonen (talk) 01:43, 2 December 2012 (UTC)[reply]

Helmholtz resonator[edit]

You made some very nice diagrams of moving air molecules used in the Wikipedia article Harmonic. I've now stuck them in Acoustic resonance, too. Thank you; they really improve the articles. Could you possibly do something similar for a Helmholtz resonator? It would really improve several articles (such as the one on ocarinas). HLHJ (talk) 03:32, 21 December 2016 (UTC)[reply]

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