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Image Linking & Hosting, various issues
djellison
post Sep 19 2021, 07:24 PM
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QUOTE (mcaplinger @ Sep 18 2021, 11:27 PM) *
I find it hard to believe that with storage prices as low as they are, this site can't afford to store reasonably-sized images.


During my tenure running this place ( long since gone ) money was never the issue.

It was finding the kind of sys admin / web dev support necessary to keep the server up to date, keep the forum software patched, keep backups properly. My hope was that when I gave the keys to TPS, that would be looked after.

The fact that this place went entirely dark in July for a day or so was because there was basically nobody running the place.

The forum should have had it's name changed to include inclusive language half a decade+ ago. It's still not happened. For the same reason.

This isn't my forum any more - hasn't been for a very long time - so it's not really my place to criticize how it is or isn't being run - but I wouldn't trust this as a place to host content I cared about in the medium to long term.
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Cherurbino
post Sep 23 2021, 06:33 AM
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The main technical problem on the way of encouraging everybody to use the third parties' image hosting facilities lays in the impossibility to use the trivial 'width=' parameter of the IMG html tag.

Recently I observed here (cannot find this post now) the attempt to display the color photo of Ingenuity's RTE at a full size of the Sony IMX214 matrix (42083120).
* the good thing was that our colleague used the IMG tag instead of uploading extra 25-26 megs on your server
* the bad thing was that he could not reduce its dispaly size with '[img width=800]' parameter like is recommended on another forums (some of them apply a script patch to perform it automatically on all large images)
I see here lots of large images from SUPERCAM, WATSON etc. which are not post-processed by members. They are reposted here only for information/discussion purposes, thus there's no obstacle to link to these images in this way
CODE
[img width=800]https://mastcamz.asu.edu/wp-content/uploads/2021/08/ZR0

(all images linked with such a syntax are usually back-resizable on a mouseclick for viewing)

QUOTE (djellison @ Sep 19 2021, 10:24 PM) *
keep the forum software patched


I was ready to help you finding such a patch, but the link to http://www.invisionboard.com/ from the 'copyright' section of the forum page (Powered By IP.Board 2021 IPS, Inc.) seems to be dead.
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fredk
post Sep 23 2021, 02:16 PM
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If you want to display a large image hosted elsewhere, reducing the image with the width attribute is not efficient, since the browser still needs to download the full-resolution image before rescaling it for display.

Much better is to instead display a lower-res or thumbnail version (which are usually available on the jpl image servers) and make it a link to the full-res image. Or if no thumbnail is available create your own, hosted on UMSF, and again make it a link to the full-res image.
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Cherurbino
post Sep 24 2021, 10:00 AM
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QUOTE (fredk @ Sep 23 2021, 05:16 PM) *
If you want to display a large image hosted elsewhere, reducing the image with the width attribute is not efficient, since the browser still needs to download the full-resolution image before rescaling it for display.

It's true, but I'm worried about the forum's quota on the hosting server, not about the download time.

QUOTE (fredk @ Sep 23 2021, 05:16 PM) *
Much better is to instead display a lower-res or thumbnail version (which are usually available on the jpl image servers) and make it a link to the full-res image. Or if no thumbnail is available create your own, hosted on UMSF, and again make it a link to the full-res image.


Testing the sample syntax of nested links with one of the latest images for sol 211. This image responds as a clickable thumbnail:



The large image is opened with the click on the thumbnail in a separate window.

This soultion is applicable to all images from NASA storage, since we beleive it shall not disappear or change URL's. But as for the other hosts, this problem is still open - they tend to disappear after a few years.

-----
QUOTE (fredk @ Sep 23 2021, 05:16 PM) *
if no thumbnail is available create your own, hosted on UMSF, and again make it a link to the full-res image.


Some image hosts allow to create the thumbnail automatically and store it alongside with the original image.

As an example, the universal, silent and explicit answer to the question asked almost everyday, "Where is Ingenuity?" smile.gif



Size of thumbnail is defined by user before uploading. Upon a click you may see the original size 1080864, so it's not necessary to use forum's storage quota even for the thumbnail.

Comment: this photo is the first place winner of NASA's third annual "Photographer of the Year" awards:
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