Some lunar thingo

iceman (Mike) · #1 20-02-2006, 06:50 AM

Was hoping to get a lunar avi or two inbetween Jupiter avi's on Saturday morning, but the dob is very hard to use to position on a crater of interest.. the movement is a bit sticky at the moment and without slowmo hand knobs (or goto), it's very difficult to find an interesting target.

So I got frustrated and only captured this one avi

I don't know what crater it is, i'll look up the atlas one day

ving (David) · #2 20-02-2006, 11:00 AM

well its a fine looking crater whatever it is

haven sen any moon stuff from you for ages mike

RB (Andrew) · #3 20-02-2006, 11:24 AM

That's so cool Ice.
Good capture using the dob.
Image scale is great too and I love how the peak just shows through the shadow of the crater wall.
Gives it a real 3D look.

Did you use any sharpening on it?

Striker (Tony) · #4 20-02-2006, 05:48 PM

That's realy nice work Mike.

keep them coming.

Vermin (Tom) · #5 21-02-2006, 12:32 AM

It was a tricky one, but I think I've tracked down and identified two of the craters in your image Mike.

67champ · #6 21-02-2006, 02:02 AM

Great job, would like to see more.....!

dt

iceman (Mike) · #7 21-02-2006, 05:51 AM

Thanks guys, and thanks for ID'ing them Tom! No wonder I didn't recognise them, never heard of them!

RB, they were processed in registax, wavelets lightly, and then some highpass filter and USM in photoshop.

Robert_T · #8 21-02-2006, 09:09 AM

Very nice shot Mike

- what does the high pass filtering do?

Muddy Diver · #9 21-02-2006, 06:50 PM

Great shot Mike

Take a look at my thread started earlier today!

http://www.iceinspace.com.au/forum/s...4148#post94148
Recognise the scenery? I was up at the same time on Saturday.

Muddy

iceman (Mike) · #10 23-02-2006, 01:00 PM

While i'm not a huge fan of my original image above, I decided to try a different processing routine for a lunar shot.

I took the TIFF file saved out of registax (after mild wavelets), took it into AstraImage and split into RGB channels, and took the green channel, applied a LR deconvolution (5/1.8) followed by a Medium unsharp mask and some gamma/contrast adjust.

I think the result is much sharper and shows more fine detail on the surface.

I might have to go back to some of my older lunar shots and see if the technique works well on those too.

RB (Andrew) · #11 23-02-2006, 01:17 PM

Yes a much better improvement Mike.
Good choice on the green channel.
Wonder if it's worth doing all three channels?

iceman (Mike) · #12 23-02-2006, 01:25 PM

I didn't recombine them - I processed the green channel and then saved just that one.

Apparently (I remember reading it somewhere ages ago) the green channel is usually the sharpest on the moon.

RB (Andrew) · #13 23-02-2006, 01:39 PM

Yes I realise you've only used the green channel.
That's because it's the most sensitive channel.
From memory I think it has twice the number of pixels assigned to the green channel to correspond to the human eye's sensitivity.

I was just wondering if you would like to try doing all three and recombining all of them.
Might be worth a try.

iceman (Mike) · #14 23-02-2006, 01:43 PM

oh sorry I misinterpreted your reply. And your explanation makes perfect sense - the ToUcam has it's pixels arranged in that fashion.

I don't see that recombining all 3 would make for a sharper image though, it'd be just like stacking less quality frames on top of the good frame. I capture the moon in black and white anyway so i'm not losing any colour detail.

RB (Andrew) · #15 23-02-2006, 01:54 PM

Yes I see, you're right Mike.