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Is it possible to detect if a question is duplicate, when the question is asking about a picture? For example, if I stick a picture onto the question and ask "what is this", is there any way for me to check if that question is a duplicate? If there is, what is the method? If there is not, then it will be very inconvenient. The picture question may result in a duplicate close and if I ask a lot of picture questions, then I will be banned for asking too much duplicate questions!

Thank you :)

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    Do you mean if a question with exact pic exist?.. Not really clear question. – nicael Nov 30 '14 at 8:57
  • Nearly exact / similar questions asking the same thing – 54D Nov 30 '14 at 8:59
  • ... are called duplicates. So what? Do you want to search by image? If the title is like "What is this" I doubt if searching there will give you any meaningful results. – nicael Nov 30 '14 at 9:01
  • Trying to search by images... Yes. Exactly. – 54D Nov 30 '14 at 9:27
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    I'm not sure I've ever seen a case where this would make sense. Do you have any examples of times when this would have been useful for you? – Matthew Haugen Nov 30 '14 at 9:42
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    @MatthewHaugen It would be useful for identification-requests on anime.se, for example. – nicael Nov 30 '14 at 9:45
  • @nicael That's what I was thinking, but is there enough coverage by those to actually make it plausible that you'd get a hit? It'd certainly be handy if it worked, I just can't imagine there are nearly as many questions and answers on there as there would be available images of any given show or movie, which means it would be rare to find a viable result. But I don't use any sites that do those, so I could be wrong. – Matthew Haugen Nov 30 '14 at 9:52
  • @Matt It will turn out in practice :) – nicael Nov 30 '14 at 10:15
  • @nicael doesn't system show a warning for askers of these questions over there at Anime? – gnat Nov 30 '14 at 12:41
  • @gnat didn't know about it, and anime.se was just an example, another example would be identification on bricks.se. Is this feature enabled elsewhere? – nicael Nov 30 '14 at 12:43
  • @nicael process to create tag-tip is described here: "Post a [feature-request] for each tag, with specific guidance... and justification for needing something more than the tag excerpt. Let folks discuss it..." – gnat Nov 30 '14 at 13:12
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Not possible to search for a pic with advanced search or dupe search (while asking, below the title).

You can try google search by image:

https://www.google.com/searchbyimage?image_url={your-image-url}?&q=site:somesite.stackexchange.com

{your-image-url} would be image you want to find;
somesite.stackexchange.com - replace it with some SE site you want to search on.

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