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I took 50k images of the night sky to make an 81 Megapixel image of the moon

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Re: I took 50k images of the night sky to make an 81 Megapixel image of the moon

#31

Earlier quoted context omitted.

Is it just me or are 4k monitors running in 1080p worse than straight 1080p monitors?

Yes, since neither GPU drivers nor most displays currently support integer scaling. See http://tanalin.com/en/articles/lossless-scaling/ for more a more in-depth explanation.

Fascinating. I assumed that an even multiple is all you need to ensure crispness.

Re: I took 50k images of the night sky to make an 81 Megapixel image of the moon

#32

Earlier quoted context omitted.

Yes, since neither GPU drivers nor most displays currently support integer scaling. See http://tanalin.com/en/articles/lossless-scaling/ for more a more in-depth explanation.

I mean would the display need to know - just GPU drivers should be able to send a 4k signal that has 4px squares each of one colour? Interesting though.

It doesn't need to, but it would suffice in case your GPU doesn't manage.

Re: I took 50k images of the night sky to make an 81 Megapixel image of the moon

#33
post #2

~~I obviously don't know enough about images... Why would you store this as a jpg and not a LOSELESS format?~~ The full resolution image is in the comments, it's uploaded small because of Reddit https://drive.google.com/file/d/1lGDV6jOHc0v5UdkxcqYShqhKBz_...

Assuming “lossless”, the main reason is you don’t want to “lose” information. For example, if someone wanted to actually use this picture to geo-reference (or would it be Lunar-reference =p) a particular reference a particular feature, you would want it to be accurate. Specific use case: you found some ice, and want to know exactly where it was, as well as composition. If you didn’t use a lossless format, you wouldn’t have confidence it wasn’t as artifact of the compression.

Edit: misstated Leo instead of lunar, Leo is low earth orbit

Re: I took 50k images of the night sky to make an 81 Megapixel image of the moon

#34
post #23

Great! It is interesting, why Google or anybody else have not made a map of Moon just like Googlemap of Earth. Are there some technical problems?

They did: https://www.google.com/moon/ Last time I used it, Google Earth provided a 3D view of the Moon and of Mars.

It's too bad they haven't updated this to act like the modern version of Google Maps. It's like going back in time to the old HTML version.

Re: I took 50k images of the night sky to make an 81 Megapixel image of the moon

#37
post #20

All the download links are down at the moment. Here's a torrent link: magnet:?xt=urn:btih:j6ixrzpitvpmkx5tgroy6utcpqr5hhhj&dn=updated%20mosaic.png&xl=304863698&fc=1

thanks for this! It is probably a smarter way to share the pic given the number o dead links...

Re: I took 50k images of the night sky to make an 81 Megapixel image of the moon

#38
post #22

The image is 9000 x 9000 pixels. Future proofing for my own-it-someday 8K monitor background.

I tried opening the image, but it made my entire laptop unresponsive[1]. So let's hope the graphics manufacturers catch up with the pixel trent before those 8K monitors become mainstream. [1] On Chrome for MacOS. Granted my macbook is a couple years old, and the Apple graphics drivers are garbage.

If you have an nvidia card in your Mac, they make drivers available which work well.

Re: I took 50k images of the night sky to make an 81 Megapixel image of the moon

#40
post #11

This is great; as another pointer, http://clarkvision.com is my go-to source for beautiful astrophotography with technical explanations. Look for astro gallery and tutorials if interested

A quick word of caution. For anyone who might be interested in astrophotography I really wouldn't recommend any of the tutorials on the clark-vision site. This is what the co-author of an astronomical image processing program had to say about them: http://forum.startools.org/viewtopic.php?f=4&t=912

"The "articles" exhibit a litany of errors, nonsense and misunderstandings of how some basic algorithms and mathematical concepts work in image processing, including (but sadly not limited to) light pollution removal, deconvolution, the commutative property in mathematics, stacking, linearity vs non-linearity of data, basic physics and color theory.

After politely inquiring why he thought any of this was good practice or scientifically accurate and getting nowhere, even after demonstrating the mathematics and writing code to disprove some of his more fanciful claims and pointing out errors and untruths. The fact that I'm having to put this warning up, gives you an indication that that didn't go very well."

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