Commons:Featured picture candidates/Image:BiodegradablePlasticUtensils1.jpg

Image:BiodegradablePlasticUtensils1.jpg, featured

•  Info created by the USDA - uploaded by ShadowHalo - nominated by ShadowHalo --ShadowHalo 18:23, 14 February 2007 (UTC)
•  Support --ShadowHalo 18:23, 14 February 2007 (UTC)
•  Support This image was probably created using polarizers, so that the stress in the plastic material translates into colours. See Photoelasticity for more details on this technique, and Photoélasticimétrie for a couple of images. --Atoma 08:52, 15 February 2007 (UTC)
•  Support --Trounce 11:09, 15 February 2007 (UTC)
•  Oppose lacking info on the object/technique. — Lycaon 12:32, 15 February 2007 (UTC) dropping my opposition , car Atoma était si gentille d'ajouter cette info aux image — Lycaon 15:11, 16 February 2007 (UTC)
  •  Info These are not compulsory informations, not a reason to oppose. --Atoma 16:49, 15 February 2007 (UTC)
    •  Comment For me, lack of info makes a picture less valuable, which is an important criterium. Lycaon 18:59, 15 February 2007 (UTC)

 Info If that's so important, I've added the information to the photo. Here it is below. --Atoma 21:04, 15 February 2007 (UTC)

 Comment Are you 100% sure that the photographer did it this way? I am very well familiar with the physics of stress, elasticity and polarization, but you can't distill that info from the website of the original photo. Unless you talked to Scott Bauer, of course ;-) Lycaon 15:11, 16 February 2007 (UTC)

 Comment Well, you never know, I never say 100% ;) But having done this experiment several times myself (at that époque I wasn't into photography yet) I would say he must certainly have done it in a similar way. --Atoma 00:28, 19 February 2007 (UTC)

 Comment I did put an email into the USDA to see about any additional information. Ideally I'll get a reply by the 22nd, but I'm not holding my breath. ShadowHalo 20:53, 19 February 2007 (UTC)

Great!! I might still support then ;-) Lycaon 20:57, 19 February 2007 (UTC)

•  Support --Lerdsuwa 16:05, 15 February 2007 (UTC)

 Info Ok, in reply to Lycaon I'll try to explain briefly the technique used to make the photo. The same text has been added in the photo description. Some (solid) knowledge in physics is required to understand this phenomenon. For those who already tried this experiment it will be easier to understand.

Explanation on the photo setup and physical phenomenon

The photo has been made using the photoelasticity method, an experimental method which gets a fairly accurate picture of stress distribution even around abrupt discontinuities in a material.

When a ray of plane polarised light is passed through a photoelastic material, it gets resolved along the two principal stress directions and each of these components experiences different refractive indices. The difference in the refractive indices leads to a relative phase retardation between the two component waves.

The setup used to photograph this photo was probably composed of: * A regular light source, with a quarter-wave plate installed to polarize the emerging light * A regular photo camera, with a quarter-wave plate installed in front of the lens

Light and camera being installed and oriented in the same direction, the two quarter-wave plates were turned with the polarizing axis in the same direction. --Atoma 21:04, 15 February 2007 (UTC)

•  Oppose I can't still understand what is the purpose of the picture. If it is to show a depiction of the stress distribution, than a single and larger piece would be better; if it is to show examples of biodegradable cutlery, why this strange form of lighting? Aesthetically, the picture is not IMO very pleasant to the eye. - Alvesgaspar 18:00, 16 February 2007 (UTC)
•  Support funcky and bizarre but hey! good. --Diligent 18:34, 18 February 2007 (UTC)
•  Support i do like it-LadyofHats 20:02, 18 February 2007 (UTC)
•  Support Yes. Yann 16:35, 20 February 2007 (UTC)
•  Support --Tone 20:53, 20 February 2007 (UTC)
•  Support Interesting and good looking a the same time, I support. /Daniel78 21:13, 21 February 2007 (UTC)
•  Support An excellent and most informative image. --MichaelMaggs 11:08, 22 February 2007 (UTC)

Edit 1: Sides cropped.

•  Comment There was a black line on the left side of the picture and only a sliver of a knife on the right, so I've cropped the left and right sides. ShadowHalo 20:25, 22 February 2007 (UTC)
  •  Comment Nice. I propose merging the cropped version to the original one after voting ends. --Atoma 09:30, 23 February 2007 (UTC)
•  Oppose Karelj 22:45, 25 February 2007 (UTC)

result: 10 support, 2 oppose, 0 neutral => featured. Simonizer 07:36, 1 March 2007 (UTC)