Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Topics - Sedat

Pages: [1]
1
Hi,

I have started using PI for calibrating, aligning and stacking very recently. Instead of using the BPP, I'd like to use the dedicated tools to have a better control on the whole process. Thanks to the Noise Evaluation script, I was able to track the noise levels after each step. The following data belongs to Luminance images shot by Atik 460 EX Mono camera:

Uncalibrated sub
m106_1_600sec_1x1_L_frame30
Calculating noise standard deviation...

* Channel #0
?K = 2.304e-03, N = 157934 (77.90%), J = 4

Calibrated sub - with Bias and Flat Masters
m106_1_600sec_1x1_L_frame30_c
Calculating noise standard deviation...

* Channel #0
?K = 2.297e-03, N = 4647476 (76.88%), J = 4

CosmeticCorrection applied sub
m106_1_600sec_1x1_L_frame30_c_cc
Calculating noise standard deviation...

* Channel #0
?K = 2.295e-03, N = 4786605 (79.18%), J = 4

StarAligned sub
m106_1_600sec_1x1_L_frame30_c_cc_r
Calculating noise standard deviation...

* Channel #0
?K = 2.030e-03, N = 4484671 (74.19%), J = 4

Stack of 30 frames
integration
Calculating noise standard deviation...

* Channel #0
?K = 4.611e-04, N = 3256902 (53.88%), J = 4


So, I'm getting more than 2x more noise in the final stack.

On the other hand, the situation with flat frames is like the following:

Uncalibrated flat sub
m106_1_0_76sec_1x1_L_frame1
Calculating noise standard deviation...

* Channel #0
?K = 5.214e-03, N = 5910648 (97.78%), J = 4

Calibrated Flat sub - with Bias Master
m106_1_0_76sec_1x1_L_frame1_c
Calculating noise standard deviation...

* Channel #0
?K = 5.214e-03, N = 5910693 (97.78%), J = 4

MasterFlat - Stack of 40 frames
MasterFlat_L
Calculating noise standard deviation...

* Channel #0
?K = 1.400e-03, N = 5864821 (97.02%), J = 4


With the flats I'm getting almost 1/4th of the noise of the individual frames.

The BiasMaster used in the calibration of these light and flat frames - Stack of 200 frames
BiasMaster_1x1_0C_20130729_200x
Calculating noise standard deviation...

* Channel #0
?K = 2.791e-05, N = 5170396 (85.53%), J = 4

The SuperBias produced from the above BiasMaster
SuperBiasMaster_1x1_0C_20130729_200x
Calculating noise standard deviation...

* Channel #0
?K = 9.400e-06, N = 2611685 (43.20%), J = 4

The subs at the beginning and end of the bias capture
Target_Set_1_0_001sec_1x1__frame1
Calculating noise standard deviation...

* Channel #0
?K = 3.089e-04, N = 5915885 (97.86%), J = 4

Target_Set_1_0_001sec_1x1__frame200
Calculating noise standard deviation...

* Channel #0
?K = 3.092e-04, N = 5913929 (97.83%), J = 4


Can somebody please explain me what's going on here ? Also, why is the SuperBias more noisy ?

I've started reading the relevant chapter in The Handbook of Astronomical Image Processing but it will take some time to go through all the details there. I thought I could get some quicker response from the gurus here.

Many thanks

Sedat

2
General / What happened to my STF icon on the Toolbar
« on: 2012 December 24 00:21:30 »
During one of the recent updates, this icon disappeared from my toolbar on the Windows 7 installation. My Mac OS installation still has it.

I have even reset all the settings but this icon is not coming back. Today I will install version 1.8 and I hope it comes back :)

Any help will be appreciated.

Cheers

Sedat

3
Hi folks,

Could you please give me a hand and process my data to show what can possibly be done with it ? I will really appreciate this.

https://rapidshare.com/files/1051544027 ... LA_HDR.rar (64 bit fits)
https://rapidshare.com/files/3163770842 ... LA_HDR.zip[/url] (16 bit tiff)[url]

I am a relatively new PI user and still have a long way to go to be able to use it properly. I must confess however, contrary to everyone's belief in the PS camp, my progress is much speedier and more fruitful compared to my PS efforts. Kudos to the developers and supporters once again.

I still have some problems with DBE, color calibration and noise reduction. For some reason MMT is not very effective on my pictures. I am suspecting the culprit to be my shooting with a DSLR. There must be an inherent noise due to the missing pixels, blocked by CFA. Whenever I apply MMT ot ATWT the background doesn't look silky smooth at all. I am sure I must be pushing some wrong buttons at some stages as well.

I have been playing with this Bode's Nebula data for the last couple of weeks. The stack I  share with you is an HDR composite of the following:

Scope: FSQ106ED @f/5
Mount: Vixen New Atlux with Starbook
Focuser:
Camera: Canon 550D - Hutech modified
Filters: None
Guide: Vixen A80SS, Orion SSAG

Exposures:
First set: 24x360 second Light @ISO1600, Master Darks, Bias, 24x Flats, 24x Flat Darks
Second set: 11x360 second Light @ISO800, Master Darks, Bias, 24x Flats, 24x Flat Darks
Shooting Date: 26.02.2012
Orientation:
Acquisition: BackyardEOS
Guiding: PHD
Stacking: Images Plus
Processing: Pixinsight
Location: Marmaris - Turkey
SQM: 21
Temperature: 9 C

This one is a quick process of the ISO1600 stack



and this is the result of the HDR composite...There are many errors I know but I guess I need a break and go back to basics before further attempts.


Can you see my White Flag waving ? :)

Thanks for reading and your help.

Cheers

Sedat

4
Gallery / M51 and companions - C11 Edge + Hyperstar
« on: 2012 February 05 11:32:55 »
Hi again,

This Pixinsight is incredible indeed. This time the calibration and stacking is done with Images Plus.




Scope: C11 Edge HD f/10 @ f/2 with Hyperstar 3
Mount: Vixen New Atlux with Starbook
Focuser: Feathertouch Microfocuser
Camera: Canon 550D - Hutech modified
Filters: CLS
Guide: Celestron 9x50 Finder/Guider, Orion SSAG

Exposures: 24x150 second Light @ISO800, 50x Darks, 50 Bias, 50 Flats
Shooting Date/Time 03.07.2011 00:17:20
Orientation:
Acquisition: BackyardEOS
Guiding: PHD
Stacking: Pixinsight
Processing: Images Plus, Pixinsight, CS5
Location: Marmaris - Turkey

File Name   M51_LIGHT_150s_ISO800_+35cC_IDAS_1143stdev_000106.CR2
Camera Model   Canon EOS REBEL T2i
Firmware   Firmware Version 1.0.8
Shooting Date/Time   03.07.2011 00:17:20
Author   BILGEBAY
Owner's Name   
Shooting Mode   Manual Exposure
Tv( Shutter Speed )   150
Av( Aperture Value )   0.0
Metering Mode   Evaluative Metering
ISO Speed   800
Auto ISO Speed   OFF
Image Size   5184x3456

5
Gallery / M101 and companions - C11 Edge + Hyperstar
« on: 2012 February 05 05:53:57 »
Hello everyone,

This is the first photo I processed completely in Pixinsight from data reduction to post processing. Only the finishing touches are made with CS5. This is also the first photo I am posting here.

I am working on this since the other day and I am not able to judge it anymore. I am not completely happy with it but I need a break now :) I need to work on noise reduction and maybe I will re-process it from stacking onwards.

I guess my focus was not dead on during the exposures. I also see  elongated stars in the corners. Anyways, here it is:






Scope: C11 Edge HD f/10 @ f/2 with Hyperstar 3
Mount: Vixen New Atlux with Starbook
Focuser: Feathertouch Microfocuser
Camera: Canon 550D - Hutech modified
Filters: CLS
Guide: Celestron 9x50 Finder/Guider, Orion SSAG

Exposures: 49x90 second Light @ISO800, 50x Darks, 50 Bias, 50 Flats
Shooting Date/Time 04.07.2011 00:03:00
Orientation:
Acquisition: BackyardEOS
Guiding: PHD
Stacking: Pixinsight
Processing: Pixinsight, CS5
Location: Marmaris - Turkey
Limiting Magnitude:
Temperature: 21.5 C

File Name   M101_LIGHT_90s_ISO800_+32cC_IDAS_876stdev_000350.CR2
Camera Model   Canon EOS REBEL T2i
Firmware   Firmware Version 1.0.8
Shooting Date/Time   04.07.2011 00:03:00
Author   BILGEBAY
Owner's Name   
Shooting Mode   Manual Exposure
Tv( Shutter Speed )   90
Av( Aperture Value )   0.0
Metering Mode   Evaluative Metering
ISO Speed   800
Auto ISO Speed   OFF
Image Size   5184x3456
Image Quality   RAW
Flash   Off
FE lock   OFF
White Balance Mode   Custom
AF Mode   Manual focusing
Picture Style   Faithful
Sharpness   0
Contrast   0
Saturation   0
Color tone   0
Color Space   Adobe RGB
Long exposure noise reduction   0:Off
High ISO speed noise reduction   3:Disable
Highlight tone priority   0:Disable
Auto Lighting Optimizer   3:Disable
Peripheral illumination correction   Disable
File Size   22506 KB[/quote]

Pages: [1]