DUduffyjp·Aug 21, 2021
I've been using this in a Rails app to detect duplicate image uploads for years. It works really well.
https://github.com/westonplatter/phashion
In pHash – An open source perceptual hash library (2013)westonplatter
phashion
Ruby2014–2021
westonplatter / phashion
phashion
Ruby wrapper around pHash, the perceptual hash library for detecting duplicate multimedia files
4Distinct people
5Mentions
0Explicit recommenders
713GitHub stars
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What it is
Ruby wrapper around pHash, the perceptual hash library for detecting duplicate multimedia files
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Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 5:04:57 PM UTC.
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HN mentions by year5 dated mentions
Observed mentions: 2014-04-03 13:14:39 UTC to 2021-08-21 15:28:24 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2014 | 2014-01-01 00:00:00 UTC | 2015-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2015 | 2015-01-01 00:00:00 UTC | 2016-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2016 | 2016-01-01 00:00:00 UTC | 2017-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2017 | 2017-01-01 00:00:00 UTC | 2018-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 1 | 1 | 0 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 2 | 1 | 1 |
What Hacker News says
5 sourcesLegal question – license of software that includes GPL 3.0 software
I am the current maintainer (albeit, not a great one, but still a maintainer) the phashion ruby gem (https://github.com/westonplatter/phashion).
I was notified by a user that the current MIT license of phashion may conflict with the GPL 3.0 license of the pHash software included in it. The argument goes that since phashion includes the source code of pHash as apart of its distribution, it needs to also use the GPL 3.0 license.
My question ... is there a licensing conflict between phashion and pHash? If so, what are the options?
Other question ... are there any open source lawyers/organizations I could talk to for free?
NOTE - I realize I'm asking a legal/IP question. I will not treat comments or opinions as legal advice.
5 points · Open discussionAsk HN: Licensing Question – MIT on Top of GPLv3?
I am not a lawyer and respect those who are.
I oversee an open source project, https://github.com/westonplatter/phashion.
A person recently asked (https://github.com/westonplatter/phashion/issues/68) if the project needs to be licensed per GPLv3 to match the phash source code license, which is "included" in the library. By included, I mean that the ruby gem actually carries a copy of the phash source code in the source code. Said differently, phashion does NOT reference a locally installed version of phash.
My question, in order to legally adhere to the phash GPLv3, should I change the license to GPLv3?
PS - I will view all comments as opinions, and do expect them to embody or be intended as legal advice. Just looking for second person's perspective.
2 points · Open discussionYou could possibly use a perceptual hash[0] to compare images. While building an image processing application I used the pHashion library to compare thumbnails to their originals to make sure it still looked "the same" to humans. It worked very well and might be useful in the case of comparing "nude" photos to a reference.
[0] http://phash.org/
[1] https://github.com/westonplatter/phashion
In Facebook asks users for nude photos in project to combat revenge pornFor Rubyists, check out the phashion gem, which is a light wrapper around pHash
https://github.com/westonplatter/phashion
In Detecting duplicate images with Python