Starship Asterisk*

Now it looks like Ganymede.

[quote=MarkBour post_id=321171 time=1646766648 user_id=141361]
Another lovely image that shows how one can change the lighting and help the eye see different features!

I'm reminded of the "Terminator Moon" image used for February 15's APOD, with this one begin very different. Today's image looks a lot like an etched-glass globe to me. Whereas the 2022-02-15 APOD showed beautiful craters and mostly lost the rays of impacts, today's image shows the rays emphatically. In that prior discussion, @johnnydeep pointed out that the Terminator Moon image had a very smooth edge. [b][i][color=#0040FF]For today's APOD, I would say that you can clearly see the bumpiness of the edge, especially on the right.[/color][/i][/b]
[/quote]

Indeed. The dark bumps on the white background are especially visible!

Another lovely image that shows how one can change the lighting and help the eye see different features!

I'm reminded of the "Terminator Moon" image used for February 15's APOD, with this one begin very different. Today's image looks a lot like an etched-glass globe to me. Whereas the 2022-02-15 APOD showed beautiful craters and mostly lost the rays of impacts, today's image shows the rays emphatically. In that prior discussion, @johnnydeep pointed out that the Terminator Moon image had a very smooth edge. For today's APOD, I would say that you can clearly see the bumpiness of the edge, especially on the right.

With reference to today's caption, please note that the word mare is singular. The plural is maria.

John

As I was scrolling down to see the description, I was thinking, "What have they done to the Moon? The colors look all wrong." Then, I read "inverted-color negative" and it was all clear.

I've never seen the Moon this way. It's really interesting. It almost gives the maria a metallic look.

[quote=daddyo post_id=321164 time=1646721496 user_id=142712]
Very nice. The yellow tint on the maria I guess is Earthshine.
[/quote]

The darkest areas of the Moon, during a full Moon, are much brighter than Earthshine. It isn't contributing anything significant to this image.

[attachment=0]InvertedMoon_Glawdzin_2048.jpg[/attachment]
Very interesting, but why?
I'm old enough to remember photo negatives! You used to get them
with your prints when you had a film developed! You needed them to
get duplicates!

Let's compare the "true color" and the "inverted color" Moons!


[float=left][attachment=1]Lady in the Moon true colors Talha Zia.png[/attachment][c][size=85][color=#0040FF]The Lady in the Moon in true color. Photo: Talha Zia.[/color][/size][/c][/float][float=right][attachment=0]Lady in the Moon inverted colors Dawid Glawdzin.png[/attachment][c][size=85][color=#0040FF]Lady in the Moon in inverted color. Photo: Dawid Glawdzin.[/color][/size][/c][/float]

[clear][/clear]


As you can see, the Lady in the Moon has two big curls or buns of hair near her forehead. The one farthest to the left is reddish in (more or less) true color, while the one farthest to the right is bluish in (more or less) true color. The colors are switched in the inverted color image.

As you can see in the true color image, there is a lot of reddish and orange color on the Moon. In the inverted image, the reddish and orange parts look greenish or bluish.

Of course light-colored areas are dark in the inverted image, and vice versa.

I'd say that the Moon is darker in color overall than you can see in the "true color image".

Ann

Very nice. The yellow tint on the maria I guess is Earthshine.

[url=https://apod.nasa.gov/apod/ap220308.html] [img]https://apod.nasa.gov/apod/calendar/S_220308.jpg[/img] [size=150]Moon in Inverted Colors[/size][/url]

[b] Explanation: [/b] Which moon is this? It's [url=https://moon.nasa.gov/]Earth's moon[/url] -- but in inverted colors. Here, the pixel values corresponding to light and dark areas have been translated in reverse, or inverted, producing a false-color representation reminiscent of a black and white [url=https://en.wikipedia.org/wiki/Negative_(photography)]photographic negative[/url]. However, this is an [url=https://www.quora.com/How-exactly-does-color-inversion-work]inverted [i]color[/i][/url] image -- where the muted colors of [url=https://apod.nasa.gov/apod/ap160201.html]the moon[/url] are real but digitally [url=https://apod.nasa.gov/apod/ap210831.html]exaggerated[/url] before inversion. Normally bright rays from the large [url=https://en.wikipedia.org/wiki/Tycho_(lunar_crater)]crater Tycho[/url] dominate the southern (bottom) features as easily followed dark green lines emanating from the 85-kilometer diameter impact site. Normally dark [url=https://en.wikipedia.org/wiki/Lunar_mare#/media/File:Moon_names.svg]lunar mare[/url] appear light and silvery. The image was acquired in [url=https://youtu.be/rv_fuDFxhWc]Southend-on-Sea[/url], [url=https://en.wikipedia.org/wiki/England]England[/url], [url=https://en.wikipedia.org/wiki/United_Kingdom]UK[/url]. Historically, [url=https://apod.nasa.gov/apod/ap200426.html]astronomical images[/url] recorded on [url=https://www.atnf.csiro.au/outreach/education/senior/astrophysics/photometry_photographicastro.html]photographic plates[/url] were directly examined on [url=https://i.ytimg.com/vi/8T6cPfb5fXg/maxresdefault.jpg]inverted-color negatives[/url] because it helped the [url=https://www.nei.nih.gov/learn-about-eye-health/healthy-vision/how-eyes-work]eye[/url] pick out faint details.


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