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

    Which Photo Best Captures the Silhouette Theme?

    For a contest that started out rather slow, this has turned into a terrific one. There are some amazing pictures in this contest, so it may be a difficult and close voting. Please choose a picture that best represents our theme, which is a picture that has a silhouette of an object/person/s...
  2. ZapperZ

    PF PHOTO CONTEST - Silhouette (9/10-9/14)

    Silhouette {NOTE: Due to the late start of this contest, you only have 5 full days to submit a photo to get us back to our regular cycle. So don't procrastinate!} The contest this week features a picture of something in silhouette. The object/person in silhouette must be the main subject...
  3. ZapperZ

    VOTE Photo Contest - Bad Picture 2

    Alright. Do you vote for the best-looking bad picture, or the worst looking bad picture? You decide! 1. neutrino 2. FredGarvin http://img411.imageshack.us/img411/5832/buckinghampalace1hc9.jpg 3. turbo-1 4. Kurdt http://img485.imageshack.us/img485/2998/smonumentto7.jpg 5...
  4. ZapperZ

    PF PHOTO CONTEST - Bad Picture 2 (10/1-10-7)

    Bad Picture 2 The last time we had this theme, it was a lot of fun, especially during the voting period (do I choose the best looking bad picture, or the worst looking bad picture?). So we will recycle this theme. Post your technically bad picture here. It can either be over-exposed, blurry...
  5. ZapperZ

    VOTE Photo Contest - Rock The Boat

    A small but amazing set of pictures for this contest. Please vote for the picture that best represents our theme, which are on boats and other floating vessels. 1. dontdisturbmycircles http://img120.imageshack.us/img120/9024/p1000654jx5.jpg 2. siddharth 3. ZapperZ 4. George...
  6. ZapperZ

    Photo Contest - Rock The Boat (8/25-8/31)

    Due to popular demand, our PF Photo Contest is BACK starting this week. All the rules are the same as before. Rock The Boat The theme this week involves boats and other floating vessels. It includes ocean liners, powerboats, sailboats, kayaks, barges, and dinghies. What are not included...
  7. ZapperZ

    PF PHOTO CONTEST - Now That Looks Like Fun (6/23-6/29)

    Now That Looks Like Fun Your pictures must contain something that would be fun to do. It would help if there are actually people having fun doing it. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In...
  8. ZapperZ

    VOTE Photo Contest - Me and My Shadow

    This promises to be another round of difficult voting. Please vote for the picture that best represents our theme: shadows! 1. hypnagogue http://img231.imageshack.us/img231/9183/archbt9.jpg 2. Task 3. larkspur 4. Janus...
  9. ZapperZ

    PF PHOTO CONTEST - Me and My Shadow (6/16-6/22)

    Me and My Shadow This week, your pictures must clearly show shadows of objects and/or persons. The picture may or may not include the object itself, but the shadow must be there.Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the...
  10. ZapperZ

    VOTE Photo Contest - Heavy Metal

    We have a bunch of very strong pictures for this contest. Let's see if we can decide our favorite. Please vote for the picture that best represents our theme, which is on metals. 1. turbo-1 2. Integral http://home.comcast.net/~Integral50/Photo_contest/HPIM2549a.JPG 3. larkspur...
  11. Evo

    VOTE Photo Contest - Ooh, Baby, Baby

    VOTE PF Photo Contest - Ooh, Baby, Baby! This is another really hard decision! Please vote for your favorite baby animal. 1. chroot http://www.virtualcivilization.org/piggle2-small.jpg 2. Moonbear http://img166.imageshack.us/img166/1680/babiestr1.jpg 3. moe darklight...
  12. P

    Analysing a photo of a mechanical cam

    hi all I have an image of a mechnaical cam from a linotype printing press. I want to get angular dispalcemetns, angular velocities and angular accelerations of this cam from the image. Is this possible. Does anyone know any software where I can get an image and then get a set of...
  13. Evo

    Final VOTE Photo Contest - April Showers Bring May Flowers

    Another big turnout in the first round voting. Ok, I have listed the pictures with the most votes from the preliminary round. You must now choose your favorite picture from the finalists. Please vote for the photo that best represents our theme, which is flowers. 1. Astronuc...
  14. ZapperZ

    Photo Contest - Heavy Metal (6/9-6/15)

    Thanks to Evo for graciously running the PF Photo Contest while I was on vacation. Heavy Metal Think "industrial". Your picture must have, as its main subject, something metallic, made of metals. This could be iron, steel, copper, alloys, etc. If it isn't clear, please include a brief...
  15. L

    Explore Our Physics Photo Gallery | Share & Discuss Photos

    We have create a new physics photo gallery to share and discuss photos related physics. We like to hear about your comments and suggestions to improve this gallery Here is the link for online physics gallery http://www.livephysics.com/gallery/main.php
  16. Evo

    Pf Photo Contest - Ooh, baby, baby (6/2-6/09)

    Pf Photo Contest - Ooh, baby, baby! (6/2-6/09) Ooh, baby, baby! Spring has sprung and baby animals are everywhere! This week's contest is - Baby Animals. Your picture must have, as it's main subject - baby animals, not humans. Contest Rules: 1. Any digital photo or digitally-scanned...
  17. Evo

    VOTE PF PHOTO CONTEST Group 2 - April Showers Bring May Flowers

    This is the 2nd group for this photo contest. Please vote for the photo that best represents our theme, which is flowers. You have one vote in each group. 1. 0TheSwerve0 2. Mk http://img296.imageshack.us/img296/1220/dsc07259gz3.jpg 3. ZapperZ 4. Integral...
  18. Evo

    VOTE PF PHOTO CONTEST Group 1 - April Showers Bring May Flowers

    This promises to be another difficult contest to vote. I broke up the voting into two groups. Please vote for the photo that best represents our theme, which is flowers. You have one vote in each group. 1. Astronuc http://img516.imageshack.us/img516/5201/1005802smallwi7.jpg 2...
  19. Evo

    Pf Photo Contest - April Showers Bring May Flowers (5/26-6/02)

    April Showers Bring May Flowers This week's contest is - Flowers. Your picture must have, as it's main subject - flowers. They can be real or artificial or an artistic representation. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be...
  20. Evo

    VOTE Photo Contest - Play It Again Sam

    Wow, This is another tough contest! These pictures are all so great! This contest didn't actually have a category, instead it was a chance to vote for some of your favorite pictures from previous contests. I am surprised that a couple were entered that I had orginally missed! Please vote...
  21. Evo

    Pf Photo Contest - Play It Again Sam (5/19-5/25)

    Play It Again Sam There are so many incredible pictures that didn't win in a prior contest, that I have decided they should get another chance. So, this weeks contest is for any previously submitted photo that did not win First, Second, or Third place in the FINAL round. Placing in a runoff...
  22. ZapperZ

    VOTE Photo Contest - Happy Mother's Day

    Wow! We have so few pictures of mothers! I'm shocked! :) Anyhow, we have a good group of entry, even if it is a small number. Please vote for the picture that best represents our theme, which is on mothers or related to Mother's Day. 1. moe darklight...
  23. S

    Amazing Saturn Photo: Cassini's Awe-Inspiring Image

    I just found this on Edge.org- it has got to be one of the most beautiful space photographs ever- taken by Casini- shown at the TED conference: http://www.edge.org/documents/images/newrings_cassini1000.gif the caption: One of these days, Edge may want to run this photo, which planetary...
  24. ZapperZ

    PF PHOTO CONTEST - Happy Mother's Day (5/12-5/18)

    Administrative Note: Since I will be going on a vacation in about 2 weeks from now, Evo has graciously agreed to run the PF Photo Contest for the next 3 contests, starting on May 19th. She gets to choose her own themes, do the polling, and update the winners list. So don't you dare give her a...
  25. ZapperZ

    VOTE Photo Contest - Life Is A Cabaret, Old Chum

    This was probably a difficult contest to have a picture of, but we still have quite a collection here. Please vote for the picture that best represents our theme, which is a live performance. 1. Janus http://home.earthlink.net/~parvey/sitebuildercontent/sitebuilderpictures/wtrfrntblus.jpg...
  26. ZapperZ

    PF PHOTO CONTEST - Life Is A Cabaret, Old Chum (5/5-5/11)

    Life Is A Cabaret, Old Chum! Our theme this week is on LIVE PERFORMANCE. Your picture must have, as its main subject, a live performance. This performance could be on a stage, on a street/sidewalk, at an event, etc. It must qualify as a live performance for an audience. Zz.Contest Rules: 1...
  27. ZapperZ

    VOTE Photo Contest - Toy Pictures 'R' Us

    A smaller number of entries this time, but still, the voting should be interesting. Please vote for the picture that best represents our theme, which is pictures of toys, stuffed animals, etc... 1. Integral http://home.comcast.net/~Integral50/Photo_contest/HPIM0880a.JPG 2. robphy...
  28. ZapperZ

    FINAL VOTE Photo Contest - Nightlight

    This is the final round of voting for our Nightlight contest. Please vote for the photo that best represents our theme, which is lighted pictures at night. 1. robphy http://img207.imageshack.us/img207/4963/albuquerquenmroute66sm0.jpg 2. J77...
  29. ZapperZ

    PF PHOTO CONTEST - Toy Pictures 'R' Us (4/28-5/)

    Toy Pictures 'R' Us This time, the subject will be on toys, stuffed animals, etc. Anything that would clearly be considered as toys that you would find at toy stores. Note that sports items DO NOT qualify. Zz. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant...
  30. ZapperZ

    VOTE PF PHOTO CONTEST Group 2 - Nightlight

    This is the 2nd group for this photo contest. Please vote for the photo that best represents our theme, which is lights (or lighted objects) at night. You have one vote in each group. 1. siddharth 2. hypatia 3. alex_caps...
  31. ZapperZ

    VOTE PF PHOTO CONTEST Group 1 - Nightlight

    This promises to be another difficult contest to vote. Please vote for the photo that best represents our theme, which is lights (or lighted objects) at night. You have one vote in each group. 1. Janus http://home.earthlink.net/~parvey/sitebuildercontent/sitebuilderpictures/lights.jpg 2...
  32. ZapperZ

    PF PHOTO CONTEST - Nightlight (4/21-4/27)

    Nightlight Our theme this week is on lights at night. Your photos must have, as its main subject, lights at night. The light source can be from anything - a candle, street lamp, bright neon signs, car headlights, etc. However, no fireworks or similar displays. The the lights must be taken at...
  33. ZapperZ

    VOTE Photo Contest - Rubber Eraser

    Considering how quirky the theme is, we have a very good group of pictures for this contest. Please vote for the picture that best represents our theme - Rubber Eraser! 1. Chi Meson 2. scorpa 3. Physics is Phun http://img263.imageshack.us/img263/4233/img2695pm1.jpg 4...
  34. ZapperZ

    PF PHOTO CONTEST - Rubber Eraser (4/14-4/20)

    Rubber Eraser This is silly enough, and trivial enough, that I just HAD to include it in our contest. April 15 is, get this, http://www.holidayinsights.com/other/rubbereraserday.htm" here in the US! Honest! You can't make these things up! So, to mark this joyous occasion (and yes, I'm trying...
  35. ZapperZ

    VOTE Photo Contest - Ain't No Valley Low Enough

    This could possibly be the most difficult contest we have so far. Every picture is a winner. Please vote for the picture that best represents our theme, which is a valley. 1. Janus http://home.earthlink.net/~parvey/sitebuildercontent/sitebuilderpictures/yosemite.jpg 2. larkspur...
  36. ZapperZ

    PF PHOTO CONTEST - Ain't No Valley Low Enough (4/7-4/13)

    Ain't No Valley Low Enough A few weeks ago, we had a contest on mountains called "Ain't No Mountain High Enough". If there are mountains, then it would be logical to follow through with the next part of the song. So this time, we will focus on valleys. Please make sure that your photo shows a...
  37. ZapperZ

    Why Was Participation Low in the April Fool Photo Contest?

    Looks like this was a difficult contest for people judging from the low turnout. Still, we have quite a selection (with one disqualification). Please vote for the picture that best fit out theme, which is April Fool. The picture must present something that is not what it seems, or what it...
  38. ZapperZ

    Photo Contest - April Fool (3/31-4/6)

    April Fool! Since April Fool is tomorrow, our contest this week will adopt that theme. Your picture must depict something that is not what it seems. It could be an optical illusion, a man dressing up as a woman (or vise versa), authentic-looking fakes, etc.. etc. You get the idea. Note...
  39. ZapperZ

    VOTE Photo Contest - People, People Who Need People

    This contest appears to be more "difficult" than I thought. One would think there would be a lot of pictures with a lot of people in it. Oh well... Please vote for the photo that best represents our theme, which is on lots of people. 1. larkspur 2. turbo-1...
  40. ZapperZ

    FINAL VOTE Photo Contest - Green With Envy

    This is the dreaded final round. It will be a difficult one. Good luck to everyone! Please vote for the picture that best represents our theme: the color GREEN. 1. SpaceTiger http://www.astroskwurl.net/PF/Green.jpg 2. Janus...
  41. ZapperZ

    PF PHOTO CONTEST - People, People Who Need People (3/24-3/30)

    People, People Who Need People Our theme this week is on people. Your picture must have plenty of people in it - at least 10. 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...
  42. ZapperZ

    VOTE Photo Contest Group 2 - Green With Envy

    This is the 2nd group in this contest. Please vote for the photo that best represents our theme for this week, which is the color GREEN. 1. Moonbear http://img59.imageshack.us/img59/3446/greenhi9.jpg 2. Integral http://home.comcast.net/~Integral50/Photo_contest/HPIM1001a.JPG 3...
  43. ZapperZ

    VOTE Photo Contest Group 1 - Green With Envy

    This is certainly going to be another difficult contest to vote on, even for the first round. You have one vote to cast in each group. Please vote for the picture that best represents our theme, which is the color GREEN. 1. SpaceTiger http://www.astroskwurl.net/PF/Green.jpg 2...
  44. ZapperZ

    FINAL VOTE Photo Contest - Sunrise, Sunset

    This is going to be another difficult final round of voting. So good luck to everyone, and well done! 1. turbo-1 http://img120.imageshack.us/img120/2898/sunsetnov17jv3.jpg 2. hypnagogue http://img177.imageshack.us/img177/9495/sunsetlg8.jpg 3. matthyaouw 4. larkspur 5...
  45. ZapperZ

    PF PHOTO CONTEST - Green With Envy (3/17-3/23)

    Green With Envy Just in time for St. Patrick's Day this weekend, our theme for this week will be the color GREEN. Your picture must have the color green as the dominant color in the picture. Good luck of the Irish. Contest Rules: 1. Any digital photo or digitally-scanned photo...
  46. ZapperZ

    VOTE PF PHOTO CONTEST Group 2 - Sunrise, Sunset

    This is the second group in this contest. Please vote for the picture that best represents our theme : a picture taken at sunrise, or sunset. Please note that in some pictures, the time it is taken isn't clear, and there may be uncertainty in whether a picture clearly qualifies with our...
  47. ZapperZ

    VOTE PF PHOTO CONTEST Group 1 - Sunrise, Sunset

    It seems that lately, every contest seems to be impossible to vote on. This one is no exception. Well done to everyone who participated. Please vote for the picture that best represents our theme : a picture taken at sunrise, or sunset. Please note that in some pictures, the time it is taken...
  48. ZapperZ

    FINAL VOTE Photo Contest - Ain't No Mountain High Enough

    This promises to be a brutal final round. Good luck to all finalists, and good luck to the rest of us who have to choose just one. Please vote for the picture that best represents our theme: Mountains! 1. cyrusabdollahi http://img254.imageshack.us/img254/7818/iranvp8.jpg 2. Integral...
  49. ZapperZ

    PF PHOTO CONTEST - Sunrise, Sunset (3/10-3/16)

    Sunrise, Sunset Our theme this week is on two of my favorite times of the day, sunrise and sunset. Your picture must have been taken during one of those times. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In...
  50. ZapperZ

    VOTE PF PHOTO CONTEST Group 2 - Ain't No Mountain High Enough

    This is the 2nd group of voting for this difficult contest. Please vote for the picture that best represents our theme - Mountains! 1. Mk http://img250.imageshack.us/img250/3089/dsc06269sr7.jpg 2. larkspur 3. hypatia http://i82.photobucket.com/albums/j269/hypatia3811/smokey.jpg...
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