Image Linking & Hosting, various issues Options

[tau]

Sol 203 Mastcam-Z right eye panorama with enhanced colors



I just found out that in addition to the file size limit for uploading images, there also seems to exist a limit to the total number of pixels in an image.
When I try to upload images with a file size of less than 3 MB but with more than or close to 25 million pixels, the attachment management menu disappears.
So I had to reduce the size (and hence resolution) of the above image to 92% (linear).

Did anybody make a similar observation?

[fredk]

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.

[Cherurbino]

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.

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.

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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.