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HyperPhysics Images

  1. Apr 22, 2016 #1

    dlgoff

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    Not being able to insert images from HyperPhysics makes it difficult to help answer physics related questions. For me anyway.
     
  2. jcsd
  3. Apr 22, 2016 #2

    berkeman

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  4. Apr 22, 2016 #3

    dlgoff

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    Yep. That's what's happening for me.
     
  5. Apr 22, 2016 #4

    berkeman

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  6. Apr 22, 2016 #5

    berkeman

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    Last edited: Apr 22, 2016
  7. Apr 22, 2016 #6

    dlgoff

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    When I tried that one this scalar product image to paint I get:

    scalar.jpg

    edit: but could be my paint settings?
     
  8. Apr 22, 2016 #7

    mfb

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    That is a transparency issue.

    Concerning the direct inclusion: apparently hyperphysics does not allow that. For a good reason, I guess: please be careful with copyright.
     
  9. Apr 22, 2016 #8

    jtbell

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    Let me try it... saving it... uploading it...

    vsca1a.gif

    (from http://hyperphysics.phy-astr.gsu.edu/hbase/vsca.html)

    Ta-da! Just save it directly to your desktop or some other convenient location, and upload it. Don't touch it with Paint or any other program. It has a transparent background so it picks up the background color of the page it's pasted into (light gray here, beige on Hyperphysics). When I open it in Photoshop, I get a gray/white checkerboard background indicating that it's really transparent. When I convert it from "indexed" to "RGB color" and "flatten" it, I get a white background because that's how I've set the default background color in Photoshop.

    vsca1a-copy.gif

    I think mfb has the right idea here. Hyperphysics probably has set up hotlink protection for images. I do the same on my own site, with exceptions for certain specific sites like PF. I think when you insert the image URL and preview the post, your browser simply takes the image from its cache because you've viewed the image before. Then when you post, the forum software tries to fetch the image from Hyperphysics and fails because of the hotlink protection.
     
    Last edited: Apr 22, 2016
  10. Apr 22, 2016 #9

    jtbell

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    When a web site implements hotlink protection, it's probably either to save bandwidth (i.e. reduce the load on the server) or to protect copyright, or both. For my site, the motivation is mainly bandwidth. If someone hotlinks an image on a popular forum, it can generate hundreds of hits per day. There are forums where people think nothing of hotlinking 5-10 images from the same site in a single post. At ~250 KB per image, that adds up pretty fast. :mad:

    But if you make a copy of the image and upload it to the forum, that's a copyright violation unless the owner allows it. Maybe Greg can contact whoever maintains Hyperphysics and ask for permission for PF users to post copies of their images when accompanied by links to the original pages like berkeman and I added.

    I put my name and date on all my images, and let people post copies for non-commercial purposes, so long as they leave the name intact. That way I get free publicity. :woot:
     
  11. Apr 22, 2016 #10

    berkeman

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    If we just post one or two images and include the URLs, is that protected under the Fair Use Act?
     
  12. Apr 22, 2016 #11

    Nugatory

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    Almost certainly not. If you use content in such a way as to provide the same information as the copied site (making a visit to that site unnecessary) it's very difficult to claim fair use. If you want to reference content from hyperphysics.... Link to it.
     
  13. Apr 22, 2016 #12

    berkeman

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    Thanks! :smile:
     
  14. Apr 22, 2016 #13
  15. Apr 22, 2016 #14

    dlgoff

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    I always accompany posted images with the original page link and would have here. Hopefully Greg can get their permission as I appreciate the rules of copyright.
     
  16. Apr 22, 2016 #15

    dlgoff

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    So what to do?
     
  17. Apr 22, 2016 #16
    Still working on it :)
     
  18. Apr 22, 2016 #17
    It's possible they blacklisted our IP for excessive hotlinking
     
  19. Apr 22, 2016 #18

    dlgoff

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    :oldcry:
     
  20. Apr 22, 2016 #19
    I'll see if I can contact them
     
  21. Apr 22, 2016 #20

    jtbell

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    It could be that their server is simply getting bogged down in general. Lately it seems to me that when I click on a link to Hyperphysics in a Google search, it often takes a long time to respond.

    That suggests a slow server. Hotlink protection via rules in the .htaccess file (or something similar on a non-Apache server) would quickly return a 403 (Forbidden) status code.
     
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