What is Photo: Definition and 505 Discussions

A photograph (also known as a photo) is an image created by light falling on a photosensitive surface, usually photographic film or an electronic image sensor, such as a CCD or a CMOS chip. Most photographs are created using a smartphone/camera, which uses a lens to focus the scene's visible wavelengths of light into a reproduction of what the human eye would see. The process and practice of creating such images is called photography.

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  1. ZapperZ

    VOTE PF PHOTO CONTEST Group 1 - Ain't No Mountain High Enough

    This promises to be another very difficult contest. Congratulations to everyone who participated. Please vote for the picture that best represents our theme: Mountains. You have one vote in each group. 1. cyrusabdollahi http://img254.imageshack.us/img254/7818/iranvp8.jpg 2. Physics is...
  2. ZapperZ

    FINAL VOTE PF PHOTO CONTEST - It's All There, In Black And White

    This promises to be an impossible contest to vote. Still, do your best to pick the picture that best represents our theme : black and while photo. 1. Janus http://home.earthlink.net/~parvey/sitebuildercontent/sitebuilderpictures/beach.jpg 2. alex caps...
  3. ZapperZ

    PF PHOTO CONTEST - Ain't No Mountain High Enough (3/3-3/9)

    Ain't No Mountain High Enough This week, our theme is on MOUNTAINS. Pictures must have real mountain/s as the main subject. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or...
  4. ZapperZ

    VOTE PF PHOTO CONTEST Group 2 - It's All There, In Black And White

    This is the second group in this contest. 1. physarrista 2. Moonbear http://img408.imageshack.us/img408/7810/armorbwuh4.jpg 3. scorpa 4. cyrusabdollahi http://img237.imageshack.us/img237/8238/iranyp1.png 5. Chi Meson...
  5. ZapperZ

    VOTE PF PHOTO CONTEST Group 1 - It's All There, In Black And White

    This one promises to be an extremely difficult contest to vote on. So good luck to everyone. Please vote for the best picture in black and white. You have one vote to cast in each group. 1. turbo-1 http://img132.imageshack.us/img132/4878/traingrayoy8.jpg 2. Janus...
  6. russ_watters

    Astonishing Photo of Russian Rocket Booster Explosion!

    I know it isn't generally kosher to link other forums, but this is just too crazy to pass up. An astrophotographer in Perth happened to be out taking a wide-angle picture of just the right part of the sky when a Russian rocket booster exploded and fell to earth. The pic is a single 30 minute...
  7. ZapperZ

    PF PHOTO CONTEST - It's All There, In Black And White (2/24-3/2)

    It's All There, In Black And White The pictures for this week's theme must be in black and white/grayscale. It can be on any subject matter. For this contest only, you are allowed to modify a color picture into black and white or grayscale. No other modification of the picture is allowed...
  8. ZapperZ

    VOTE Photo Contest - Happy Chinese New Year

    This was probably a difficult contest to get or find a picture for many people. Still, we have a set of very strong pictures here, so voting might be tight! Please vote for the picture that best depicts our theme, which is either on the chinese people or culture, or on pigs to celebrate the...
  9. ZapperZ

    VOTE Photo Contest - Will You Be My Valentine?

    Another round of amazing pictures. This round of voting should be interesting. Please vote for the picture that BEST reflect our theme: anything to do with Valentine's Day. 1. hypatia 2. ZapperZ 3. Moonbear http://img232.imageshack.us/img232/3779/valentineskissesci7.jpg 4...
  10. ZapperZ

    VOTE Photo Contest Final Round - Turning Over A New Leaf

    This promises to be a tough final round for this contest. Please vote for the picture that best represents our theme this week, which is all about leaves! 1. Janus http://home.earthlink.net/~parvey/sitebuildercontent/sitebuilderpictures/fall.jpg 2. Moonbear...
  11. ZapperZ

    PF PHOTO CONTEST - Will You Be My Valentine? (2/10-2/16)

    Will You Be My Valentine? Valentine's Day is almost upon us. This week's theme is all about Valentine's day and what it represents. You picture must have a subject matter that has a clear connection to or representation of Valentine's Day. I may have to make a judgement call in cases where...
  12. ZapperZ

    VOTE Photo Contest Group 2 - Turning Over A New Leaf

    This is the 2nd group for this contest. Please vote for the picture that best reflects our theme, which is on leaf/leaves. 1. FredGarvin http://img294.imageshack.us/img294/9505/veriagatedacerdh9.jpg 2. alex caps http://bikeflat.com/albums/album07/DSC_1446.sized.jpg 3. turbo-1...
  13. ZapperZ

    VOTE Photo Contest Group 1 - Turning Over A New Leaf

    This will be another difficult round of voting. You have one vote for each group. Please vote for the picture that best reflect out theme this week, which is on leaf/leaves. 1. SpaceTiger http://www.astroskwurl.net/leaves_pf.jpg 2. Janus...
  14. ZapperZ

    Photo Contest - Turning Over A New Leaf (2/3-2/9)

    Turning Over A New Leaf This week's theme is all about leaves, the biological kind. Your picture must have, as its central subject, a leaf, or leaves. This must be a real leaf, not fake, or picture/painting of a leaf. Contest Rules: 1. Any digital photo or digitally-scanned photo...
  15. ZapperZ

    VOTE Photo Contest - Cry Me A River

    Wow! Amazing pictures! I shouldn't be surprised anymore by now since we have had outstanding pictures during all the contest, but they continue to be amazing. Well done everyone! Please vote for the picture that best represents our theme this week, which is a picture of a river. {Since...
  16. ZapperZ

    PF PHOTO CONTEST Final Vote - Straight and Narrow

    This is going to be a very difficult final round, so good luck to everyone. Please vote for the picture that best represents out theme, which is things that are straight and narrow. 1. turbo-1 http://img262.imageshack.us/img262/4175/wirebridgepy3.jpg 2. twisting_edge 3...
  17. ZapperZ

    PF PHOTO CONTEST - Cry Me A River (1/27-2/2)

    Note that I have added an additional rule to our contest. This is posted in Item #4 in this list. Cry Me A River This week's theme is all about rivers of water. Your picture must have a river as its main subject. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant...
  18. ZapperZ

    VOTE Photo Contest Group 2 - Straight and Narrow

    This is the second group in this contest. Please vote for the picture that best represents our theme, depicting a scence that is straight and narrow. 1. matthyaouw 2. alex caps http://bikeflat.com/albums/WashingtonDC/WashMonSky.sized.jpg 3. SpaceTiger 4. 3trQN...
  19. ZapperZ

    VOTE Photo Contest Group 1 - Straight and Narrow

    Wow! We have an astounding collection of photos for this contest! Well done everyone! This is going to be a tough round of voting, even for the first round. So good luck in choosing your favorite picture. Please vote for the picture that best represents our theme, depicting a scence that is...
  20. N

    Real photo of an atom or maybe quark?

    Homework Statement I'm making a sort of physics presentation because I'm graduating high-school soon and my physics so far sucks and the low grades won't let me go in university... anyway I need to make it look more scientific, not like an illustrated book for kids. That's why I need some REAL...
  21. ZapperZ

    PF PHOTO CONTEST - Straight and Narrow (1/19-1/26)

    Straight and Narrow Our theme this week is on anything that is "straight and narrow" (I'm sure you can guess what would not be allowed on PF, so don't even try). Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest...
  22. ZapperZ

    VOTE Photo Contest - Now that's funny

    I'm glad I'm not allergic to cats, or I would be in serious trouble with this thread. There are a lot of cats around here! :) Please vote for the picture that you think tickled your funny bone the most. 1. SpaceTiger http://www.astroskwurl.net/jp.jpg 2. turbo-1...
  23. ZapperZ

    PF PHOTO CONTEST - Now That's Funny (1/12-1/18)

    Now That's Funny! This week's picture must contain something that is funny or amusing. It cannot be a photo of a picture, painting, mural, screen shot, comic panel, etc. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest...
  24. ZapperZ

    VOTE Photo Contest Group 2 - Let it snow, let it snow, let it snow.

    The second group of photos for this contest. Please vote the picture that best depicts our theme, which is SNOW. 1. jtbell http://web.presby.edu/~jtbell/blizzard/Calvert.jpg 2. scorpa http://i4.photobucket.com/albums/y117/Scorpa/IMG_0114.jpg 3. Moonbear...
  25. ZapperZ

    VOTE Photo Contest Group 1 - Let it snow, let it snow, let it snow.

    This is going to be one of the toughest contest to vote on. So well done, and good luck to everyone! Please vote for the picture that best depicts our theme, which is SNOW! This is the first group of pictures. You have one vote for each group. 1. iansmith 2. sas3...
  26. M

    Photoelectric Effect: Grade 12 Questions Answered

    ok what i don't understand is that, after a certain amount of time, won't the piece of metal loose all its electrons becoming completely positive!, what will happen then, just beomes +vly charged, am in grade 12 and my teacher couldn't give me a satisfying answer, thanks
  27. ZapperZ

    PF PHOTO CONTEST - Let it snow, let it snow, let it snow. (1/5-1/11)

    Let it snow, let it snow, let it snow. It's winter, at least in the northern hemisphere. While some parts of the world has been unusually balmy, others have been buried under tons of snow. So this week, let's make snow cones out of all that snow. The theme this week is SNOW! So find pictures...
  28. ZapperZ

    VOTE Photo Contest - Happy New Year

    A small, but amazing quality of pictures for this contest. There were imaginative ones, and at the other spectrum, a picture that stretches the imagination beyond possible to include the theme <looks at gokul> :) Please vote for the picture that best reflects our them, which is to depict...
  29. ZapperZ

    PF PHOTO CONTEST - Happy New Year (12/29-01/04)

    Happy New Year! Our contest this week will straddle into the new year, so what better theme can we have at this time? To celebrate the year 2007, our contest this week will involve anything to do with the Number 7. It could be a picture of a building that has only 7 floors, or a large number...
  30. ZapperZ

    VOTE Photo Contest - We Built This City

    It was a fun contest, especially when people complained that the tune representing our theme stuck in their heads! :biggrin: Please vote for the picture that best shows the scene from a city. 1. larkspur 2. SpaceTiger http://www.astroskwurl.net/nashville2.jpg 3. hypnagogue...
  31. ZapperZ

    PF PHOTO CONTEST - We Built This City (12/22-12/28)

    We Built This City! We have had contest depicting the tranquil countryside, farmland, and other rural areas. This time, we deal with the big bad boy. The theme this week will be on scenes from a city or any urban area (suburbia doesn't count). Merry Christmas, Happy Hannukkah, and Happy...
  32. ZapperZ

    VOTE Photo Contest - Happy Holidays

    A surprisingly small number of entries (maybe everyone's on vacation already), but not lacking in quality. So well done to everyone who submitted a picture. Please vote for the picture that best represents our theme "Happy Holidays", which depicts a holiday decorations sans christmas trees...
  33. ZapperZ

    PF PHOTO CONTEST - Happy Holidays (12/15-12/21)

    Happy Holidays! With tonight marking the beginning of Hanukkah, and with Christmas looming upon us, I thought this would be a suitable theme for our photo contest. Your picture must reflect a holiday decoration, celebration, activities, etc. It can be of any religious or secular holiday, so...
  34. ZapperZ

    VOTE Photo Contest - O' Christmas Tree, O' Christmas Tree

    It was a smaller number of entries than I anticipated for this time of the year (I thought there were a lot of Christmas trees around). Still, it wasn't lacking in quality and "interest", especially with that deer head that wasn't even part of the tree! :) Please vote for the picture that...
  35. ZapperZ

    Photo Contest - O' Christmas Tree, O' Christmas Tree (12/7-12/13)

    O' Christmas Tree, O' Christmas Tree It is that time of the year where evergreen trees are decorated and lit. Your photo for this contest must have, as the main subject, one or more christmas trees. The tree may or may not be decorated. Contest Rules: 1. Any digital photo or...
  36. ZapperZ

    VOTE Photo Contest - Old MacDonald Had A Farm

    Another round of solid pictures by everyone. Please vote for the picture that best represents our theme, which is scene from a farm. 1. deerhake.11 http://www2.wcoil.com/~rita/DSC00635.JPG 2. Averagesupernova 3. scorpa...
  37. ZapperZ

    FINAL VOTE Photo Contest - She Blinded Me With Science

    This will be a tough final round of voting since all the pictures are awesome! Well done everyone! 1. GeoMike http://www.mcschell.com/qdike.jpg 2. matthyaouw 3. Integral http://home.comcast.net/~Integral50/Ice2.JPG 4 mrjeffy321...
  38. ZapperZ

    PF PHOTO CONTEST - Old MacDonald Had A Farm (11/30-12/6)

    Old MacDonald Had A Farm This week's photo contest is all about FARMS. Your picture must have, as the main subject, scenes at a farm. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a grey...
  39. ZapperZ

    VOTE Photo Contest Group 2 - She Blinded Me With Science

    The 2nd group of pictures for this contest. 1. nazzard http://img142.imageshack.us/img142/4323/temzy4.jpg 2. robphy http://img435.imageshack.us/img435/7747/pfalbuquerqueprismsft9.jpg 3. Monique http://img66.imageshack.us/img66/3919/celldivisioncl6.jpg 4. turbo-1...
  40. ZapperZ

    VOTE Photo Contest Group 1 - She Blinded Me With Science

    A lot of terrific pictures in this contest. You have one vote to cast for each group. Good luck to everyone! 1. GeoMike http://www.mcschell.com/qdike.jpg 2. ZapperZ 3. matthyaouw 4. Integral http://home.comcast.net/~Integral50/Ice2.JPG 5. iansmith 6. mrjeffy321...
  41. ZapperZ

    PF PHOTO CONTEST - She Blinded Me With Science (11/23-11/29)

    She Blinded Me With Science! Since this is technically a science forum, this week's photo contest must have the main subject related to science. This includes anything that is clearly related to physics, chemistry, biology, and engineering. Contest Rules: 1. Any digital photo or...
  42. ZapperZ

    VOTE Photo Contest - Happy Thanksgiving

    I thought people would have a lot more things to be thanksful for! Although, for a while there, I thought this was another "What's New Pussycat?" photo contest. :) Another round of very strong pictures for this contest. Good luck to everyone! 1. Robert Mak...
  43. ZapperZ

    PF PHOTO CONTEST - Happy Thanksgiving (11/16-11/22)

    Happy Thanksgiving! It is Thanksgiving holidays in North America at this time of the year. Rather than pick a theme that depicts such a holiday (which will restrict it very much to those only in N. America), I have decided to expand the theme. So for this week's contest, the pictures must...
  44. ZapperZ

    PF PHOTO CONTEST - Lighthouse (11/9-11/15)

    Lighthouse Since this was suggested earlier, we will have a contest on lighthouses. The main subject of your picture must be a lighthouse. Note that this has to be a "real" lighthouse, not a toy or a miniature or a decorative piece (like the one you can find at a Disney theme park). It...
  45. ZapperZ

    PF PHOTO CONTEST - Pretty In Pink (11/2-11/8)

    Pretty In Pink This time, your pictures must have the color pink as the main subject. Objects or landscapes having such a color qualify. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a...
  46. ZapperZ

    PF PHOTO CONTEST - Halloween (10/25-11/1)

    Halloween! Since Halloween is coming up next week, our theme this time will be on this festivities. All pictures with a clear reference to Halloween as the main subject of the picture qualify. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be...
  47. ZapperZ

    PF PHOTO CONTEST - Icons (10/18-10/24)

    Icons The theme this week is on "icons". The picture must contain a landmark or symbol that clearly is identifiable with a particular location, city or country. For example, a picture of the Empire State Building would be an icon for New York City, or a picture of a plate of beignets would...
  48. ZapperZ

    Photo Contest - Tranquil (10/11-10/17)

    Tranquil The picture must reflect the meaning or spirit of that word. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a grey area, or you're not sure if the picture is suitable, check with me...
  49. ZapperZ

    Photo Contest - Bad Picture (10/4-10/10)

    Bad Picture! This time, the theme is pictures that did not turn out, technically, as well as it should. Overexposed, underexposed, too dark, blurry, finger-in-picture, etc. all qualify. Note: such accidents should not be done deliberately just to qualify for this contest! So go through your...
  50. edward

    Stunning Photo of Saturn from Space Revealed

    This was on the news a few days ago. They must have used one heck of a lens filter. http://antwrp.gsfc.nasa.gov/apod/ap060921.html
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