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How would one make a 3 meg picture accessible?

  1. Apr 13, 2016 #1

    jim hardy

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    Is there a way to post really big jpg images ?

    In an EE thread, a kind user cleaned up a PDF schematic diagram to make it legible.
    He emailed it to me asking if i knew how to post it...

    I was able to "copy image" and paste into Paint, save as jpg....
    Of course it's big, 3.2 meg

    I tried a test post and the forum software re-sizes it to fit,
    which is great we no longer need a IMAX screen
    but it's too small to read

    I tried Photobucket , it's not legible there either

    Does PF have an album where we can post such things ?
    The thread is
    How to test a Bi-Directional Triode Thyristor

    even the pdf OP linked is poor quality .

    Suggestions how to give thread participants access to the improved image ?

    @Tom.G You greatly improved it ... i dont know how
    somebody will know what to do

    old jim
     
  2. jcsd
  3. Apr 13, 2016 #2

    Simon Bridge

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    You'd have to use an online service like photobucket.
    Post a warning about the image size.

    Consider if the image really needs to be so big at the outset... could the information be presented in a less bandwidth-intensive way?

    Use a format that supports lossless compression for diagrams (png?)
    Use a vector drawing format - these resize well.
     
  4. Apr 13, 2016 #3
    In Paint, try clicking 'Resizing' and resize by 50% percentage. Then save the image. The size of it should be displayed at the bottom. It shouldn't affect the size of the image.

    Or you could PM me and email me the PDF so I can extract the image and see what I can do?
     
  5. Apr 13, 2016 #4

    Simon Bridge

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    If you draw a 1px wide line in a jpeg, paint, the reduce it to 10% ... do you still see the line?
    Im guessing it may be a blur at 50%... dunno how paint handles jpegs.
     
  6. Apr 13, 2016 #5

    jim hardy

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    Thanks Guys

    i'm not very computer literate


    i zoomed to 800%, drew the narrowest line selectable with pencil tool and "size", it was sill visible zoomed out to 50%
     
  7. Apr 13, 2016 #6
    What I have noticed is I've scanned images to .jpg (and sent myself pictures from my tablet) which are around 2MB in size. I resize them by 50% and save, thus reducing the size. When I view them in Photo Gallery etc. they look exactly like they did before I reduced the size of the file.
     
  8. Apr 13, 2016 #7

    jim hardy

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    At 50% it looked pretty good
    but at even 30% it's too big to post (1180 pixels wide) and too small to read....
     
  9. Apr 13, 2016 #8
    Ah -- if you need it readable, it definitely needs to be larger. Was the file you sent me the original size of the image?

    EDIT: unless you intended for the way it was, to be that way.
     
  10. Apr 13, 2016 #9

    jim hardy

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    It's the result of opening the pdf , click "copy image", open Paint, click "Paste" the "save as ...jpg" i dont remember resizing anything - but who knows what Acrobat did to it.

    I'll send the pdf too !
     
  11. Apr 13, 2016 #10
    Yes, that'll be great! I might be able to help you further.
     
  12. Apr 13, 2016 #11

    jim hardy

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    Sent at 7:39 US Mountain Time

    I left it attached to last post in that thread as a thumbnail - that might be the answer....
     
  13. Apr 13, 2016 #12

    jtbell

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    I thought you might be able to post it as an attachment, using the "upload" button, then the "Insert: thumbnail" option. This image is 1920x1080. I thought I'd be able to see the original size by clicking on it. It does expand, but only up to a maximum size which is apparently 960x720.

    Austin10.jpg

    I made a PDF out of it. Let's see how that goes... it works but I have to download it and open it on my computer.
     

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    Last edited: Apr 13, 2016
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