Jupiter 14may

Lester · #1 15-05-2006, 07:59 AM

Hi everyone,

Well as I was about to go to bed last night, one last peek at the sky and the clouds were breaking, so off to the observatory=1km drive to highest point on farm, at 11.30pm.

Telescope was the same as ambient=12.1
brightness=50%
Gamma=25%
saturation=100%
shutter=1/20
Gain=50%
seeing=8/10
captured at 10fps
Processed in Registax and Picture Publisher
Jupiter was just past the meridian.

Who do you stop the cross hatch effect on the jpeg? It wasn't noticeable on the bitmap.

Thanks.

[1ponders] (Paul) · #2 15-05-2006, 08:10 AM

Hi Lester, just for an experiment, open the bmp in Paint and then save it as a jpeg. The quality won't be great but it would be interesting to see if you get the same compression artifacts.

asimov (John) · #3 15-05-2006, 08:16 AM

Cripes! Look at the detail you've got in this one!

Did you compress it in picture publisher? Check the compression settings..you dont need to compress it once its a JPEG to get it on site..

iceman (Mike) · #4 15-05-2006, 08:18 AM

Ditto to asi. It looks like you've compressed the jpeg.

Make sure you use no compression when saving a jpeg of that size - it will still be under the forum guidelines.

Heaps of detail, and much brighter than your previous efforts. Well done!

davidpretorius · #5 15-05-2006, 08:21 AM

very nice lester, great to see you can monitor the temps!

it will save you lots of time!

matt · #6 15-05-2006, 08:25 AM

That's a great image Lester. Well done!

You've really improved very rapidly. Must be a natural.

Good advice from Mike and Asi as well.

Excellent!!!

Lester · #7 15-05-2006, 08:37 AM

Thanks everyone for your guidance,

Will see if I can get uncompressed jpig (oink oink) jpeg

[1ponders] (Paul) · #8 15-05-2006, 09:23 AM

Wow, much better, especially around the limb areas.

iceman (Mike) · #9 15-05-2006, 10:09 AM

Awesome!

Lester · #10 15-05-2006, 11:33 AM

Thanks to Mike

, Paul

, Matt

, David

and Asi

,

Because I feel you have given me a lot of information to acheive in this area.

Here is my second avi from last night= same setings as no.1

But added colour saturation in picture publisher=bit toooo much. Even though was the lowest setting. Will try again later when got time.

iceman (Mike) · #11 15-05-2006, 11:44 AM

Lester do you have an FTP program? It would be great if you could upload the AVI to the IceInSpace FTP area for me to have a play with!

Lester · #12 15-05-2006, 12:42 PM

Sorry Mike,

I don't know what a FTP program is, I will ask my special wife who know heaps about computers when she gets home from work.

Lester · #13 15-05-2006, 04:10 PM

Hi,

Here is another from last night. At 15fps Brightness=25 gamma=40 saturation=100 shutter 1/10 gain=30

Seeing conditions has dropped off to 5/10
Telescope was 1.1 degrees above ambient= forgot my ice packs to keep scope cool.

When I brighten image onion rings increase. I think in future I will just use 10 fps and 15 only when seeing is very good.

davidpretorius · #14 15-05-2006, 04:20 PM

i would recommend always going to 5fps instead of 10fps when the seeing is great. less compression of the images

matt · #15 15-05-2006, 04:21 PM

Good effort Lester.

I'd go for a little less gamma and a little more brightness, maybe?

The other thing: unless I'm mistaken and I'm sure someone will correct me if I am, but in better seeing conditions I think you actually need to go the other way, 5fps rather than 15fps.

I think that way you get less compression on those very nice frames captured on very good nights?

You push the fps higher if you want to maximise the number of frames in less than good seeing in the hope you'll get more good frames to work with from a bunch of ordinary frames?

Lester · #16 15-05-2006, 04:23 PM

Okay, here is another try at No.1 which is the same avi as entry 7 and 10

asimov (John) · #17 15-05-2006, 04:27 PM

Gee! Getting good mate!

[1ponders] (Paul) · #18 15-05-2006, 04:33 PM

Nice shot Lester. I really like the detail on that last shot.

Ditto about the frame rate, plus boost your gain. Don't be scared to have the image on your laptop look a bit too bright. That is more than likely where your onion rings are coming from. Not enough gain. Don't worry too much about getting the colour right on your screen. You can worry about that after you have processed through registax. If you don't have it download K3CCDTools V1 and use that to capture with. It has a histogram you can use to judge exposure. Keep it in the 230 - 250 range using mainly gain and gamma (brightness around 30 - 40 %) and you will be sweet.

Oh and if you are able to dim your laptop screen.........don't! Leave it at normal brightness. You are the only one there. You are not worried about being dark adapted and IMO a dim screen will not produce the results you want. In fact if you can calibrate your screen if you can, though if you laptop is anything like mine its a bit of a joke to calibrate without access to a full range of controls.

Do you use the histogram in registax when you are processing to adjust the white and black point?

Lester · #19 15-05-2006, 04:39 PM

Thanks John and Paul,

Wrote that in my recipe book, boost gain.

Better go stick my scope on ice ready for tonight.

davidpretorius · #20 15-05-2006, 04:40 PM

i like that one lester