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reply to post by qmantoo
squiggly
Like what exactly? How large is this item? So, how do we know it is below the resolution threshold?
It looks more like a photo artefact, as the photo doesn't have enough resolution to show something like that.
Like an interference pattern, for example.
Originally posted by qmantoo
Like what exactly?
The size of the item is irrelevant, what I'm talking about is that the photo, for some reason, has too much noise, reducing, in practice, the resolution (if you zoom in you can see that some pixels appear rectangular instead of square), but the "worm" appears for some pixels without any sign of noise, as if it was sharper than the rest of the photo. That's why I think it's an artefact, the result of some pixels from the noise getting in the right places to give it a different look.
How large is this item? So, how do we know it is below the resolution threshold?
I am talking about this photo, not all other photos, obviously.
If the Rover images produced artifacts like this all over the place, the photos would be totally unuseable for any kind of science at all.
I did, as I always do, and I went looking for a better (non JPEG) version of the image, as you can see below.
Please spend a little time in considering this image rather than just dismissing it as an artifact.
Those photos are not scanned, they are digital, so there's no need of scanning them.
It is obviously not a post-processing hair, but maybe it is a piece of spagetti from a NASA employee's dinner which got stuck to the scanner perhaps?
Artefacts can have any shape, it depends on how they were produced.
It is easy to dismiss something as an artifact if you have no other explanation for it, but usually artifacts are square-ish and this one is definitely "wiggly". Any further, more realistic ideas?
Look above for the original, or at least a version as close to the original as possible.
The Rover images themselves can easily resolve items of this size. Now, the actual images we get to see may not be very good but I think the originals would be able to.
The photos from the PDS, like the one I posted, do not suffer from all those artefacts, but when there are too much noise they also look bad.
Originally posted by qmantoo
ArMap, OK, thanks for taking the time to reply in detail. It could be as you say, an artifact, however, it IS strange that the best photos we have from the pds which are supposed to be used by science still contain these kind of anomalies.
How could that be when the sensor is only 1024 x 1024?
In the past I have been told by somone involved in the design of the Rovers that the originals are gigabyte size when they are downloaded however all we end up with when the pds file is extracted is a pathetic gif of often less than one megabyte.
It's not.
Originally posted by qmantoo
I knew that some of the images were 1024x1024 pixels and that they are taken in B & W with filters. This works out to be about 3Mb each image if my math is correct.