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Topics - mcbbcn

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1
General / Preprocess script error
« on: 2013 December 07 11:16:47 »
Hi,

The only thing new about my process is that I'm using the Batch Preprocessing Script from an LRGB image for the first time.  I've been successfully able to create my flats & lights  in the past using the same process I'm using right now.

Here are screenshots of my lights, my flats, and the error I get...I assume that the script is not asking me to create a 300 second flat, right?  :P

...by the way, I use the MaximDL Skyflat assistant to create the flats...the only think I'm noticing with Harry's video is that between Binning 1 and above the name of the flat, he has one more identifier in the hierarchy like "G-Green 1.00", and then one more that says "11.00s", and then the name of the file.  So, I'm wondering if the MaximDL Skyflat assitance is not adding all the information I need in the Fits header for the script to recognize all the aspects of these flats.  Any thoughts?

Also, as Harry suggested in his video, I did an 'Add all files', and the script recognized those files as flats, and automatically set them in the Flats tab, and split them by filter...

Thanks for your help,  M.

2
Hi,

I sent a couple of emails to pixinsight support & I did not get any answers.  Then, I filled in the contact form, and I did not get any answers either, so I thought the forum gets quite a bit of visibility, so perhaps Juan or somebody can help me out.

Also, I read in the forum that if I get a checksum error while downloading the 1023 version, I'm using the wrong user/password.  But, if I put the wrong password, it's giving me a 'wrong user/password' error, and if I put my real password is giving me a checksum error

In addition, I tried my user and password at this site http://dist.pixinsight.com/ and I could login just fine, but when I use the user and password for the 1023 update, I get a checksum error.

Thanks for your help,

Miguel Casas
Portland, OR

3
Hi,

As a newbie, there is always the potential that I'm asking the wrong question, but I have to give it a try.  :laugh:

If I wanted to increase the red signal by 15% in the shadow point of an image, what would the Pixelmath function look like?

Also, I would like to know what the pixel math formula would look like if I wanted to apply it to the midpoint or highlights of the Red channel.

Thanks in advance for your help,

M.

4
Hi all,

I have the following image which has been DBE, RGB combined with Ha, and then background calibration, color calibration, HDRMT, and finally combined with Luminance.  I believe the image is pretty well balanced from a color standpoint, but the blue signal is weak.  I've tried to saturate the image during L + RGBHa but it gets a fair amount of good signal in the Red/Ha channel, but the blue is not great.  I'm familiar with the effect of increasing the signal for just one color channel in Photoshop, but usually that gets all the colors out of whack.  I have a pretty good star mask in Pixinsight, so I know I can protect the star colors, but I'm worry that if I increase the blue for the nebula, it'll take the Red/Ha channel out of whack for the whole nebula, so I wanted to ask for your opinion or any tips you may have...

By the way, I expose from a Bortle 8 location, so it's difficult enough to get any signal at all given all the LP, but if you have any tricks up your sleeve, I would love to hear.

Thanks for your help,

Miquel Casas
Portland, OR


5
Hi again friends,

As I got your help to resolve the issue with the flats, I thought it would be worth it to go back in a new post to the overall topic of processing subs that are made with OSC CCD's.

I took a shot with my QHY8C (one-shot color CCD) of NGC6960.  The current shot is just a test one, and it's about 25min. from a light polluted location.  The image has been calibrated, debayered, star aligned, integrated, cropped & DBE & as a suggestion from Geert, I've applied star mask and noise reduction.

http://dl.dropbox.com/u/8971416/NGC6960_integrationv1_dc.fit

Typically, what I do after DBE is:

1. BackgroundNeutralization which does not seem to have any effect on my color camera.  It just seems to work for Mono CCD.
2. ColorCalibration which does not seem to have any effect on my color camera.  It just seems to work for Mono CCD.
3. Convert the image from non-linear to linear using STF and Histogram tool
4. ACDNR
5. HDRMultiscalteTransform i.e. Typically a value of 4
6. Histogram Stretch
7. SCNR to remove any Green traces

Now, I've received advise that the Mono processing & color processing are pretty similar, but I'm finding that steps like #1 & #2 does not seem to make any difference in the image.  The background and colors of the stars come out pretty well balanced after debayered & DBE.  Now, if you have a different flow for Color or any tips or tricks that can help me extract the color of the nebula without overly saturating the image, I would love to learn them.

So, more than improving the attached image, I'm mostly interested in your workflow when processing subs made with an OSC CCD.

Thanks again for all your help,

Miquel Casas
Portland, OR

6
Hi all,

I took a shot with my QHY8C (one-shot color CCD) of NGC6960 & I'm finding it extremely challenging to pull the nebular color.  The exposure is about 4.5hours from my light polluted location.  The image has been calibrated, debayered, star aligned, integrated, cropped & DBE.

http://dl.dropbox.com/u/8971416/NGC6960_integrationv1_dc.fit

Typically, what I do after DBE is:

1. BackgroundNeutralization which does not seem to have any effect on my color camera.  It just seems to work for Mono CCD.
2. ColorCalibration which does not seem to have any effect on my color camera.  It just seems to work for Mono CCD.
3. Convert the image from non-linear to linear using STF and Histogram tool
4. ACDNR
5. HDRMultiscalteTransform i.e. Typically a value of 4
6. Histogram Stretch
7. SCNR to remove any Green traces

Now, I've received advise that the Mono processing & color processing are pretty similar, but I'm finding that steps like #1 & #2 does not seem to make any difference in the image.  The background and colors of the stars come out pretty well balanced after debayered & DBE.  Now, if you have a different flow for Color or any tips or tricks that can help me extract the color of the nebula without overly saturating the image, I would love to learn them.

Thanks for your help,

Miquel Casas
Portland, OR

7
General / Tutorial for processing One-shot color images?
« on: 2012 August 02 23:36:32 »
Hi,

Does anybody has a good example or tutorial on how to process one-shot color images?  I've seen the LRGB one and I've learned quite a lot from it, but I was wondering how does the one-shot images differ in PI processing techniques.

Also, I would be interested in any one-shot color processing with light pollution.

Thank you,

Miquel Casas

8
General / Batchpreprocessing - Bug on CFA RGGB option?
« on: 2012 August 02 23:26:52 »
Hi,

I just noticed that when I debayer one of my M57 subs with the debayer tool or the batchdebayer script, and I select in both tools RGGB, I get the right colors (i.e. a nice red ring around M57) but if I use the Batchpreprocessing script and I select RGGB, then I get the wrong colors.  I have the feeling the Batchpreprocessing script is not working right with the CFA RGGB option.

Any thoughts?

Miquel Casas

9
Hi,

What is the process for subtracting your master bias information from your master dark outside of the Image Calibration menu?  I'm asking because there is a pretty cool batch processing script to do all the calibration, registration & alignment in one go, but I don't believe it has a "calibrate checkbox" as you get in the image calibration, but I don't want to do an image calibration against lights in the image calibration menu, I just would like to have a Master Dark that has the Master Bias already subtracted.

Any thoughts?

Thank you,

Miquel

10
General / Blue stars but no yellow or red stars
« on: 2011 October 12 23:43:31 »
Hi again,

I've calibrated, registered, combined and processed M31 following the NGC 1808 Pixinsight tutorial but when I increase saturation, I can see my blue stars, and stars that are supposed to be yellow or red are magenta, which may indicate too much blue signal.  I tried to use curves & levels in Photoshop but I can't get the stars to be yellow or red, they seem to be at the most magenta.  I don't know if it's because I'm lacking green signal, but I had to apply the Noise Reduction SCNR for Green average, because I had the same green artifacts that you could see in the NGC 1808 (2nd part towards the end).

By the way, when I tried to lower the blue, some of the most powerful stars start to turn green...weird!

Do you have any thoughts how to have a better star colors?

Here you have a pic of where I'm at.

Thanks for your help,

Miquel

11
General / Flats & Calibration question with stubborn dust mote
« on: 2011 October 10 20:25:58 »
Hi,

This is my 2nd newbie question today.

My flats have a dust mote that is so black (in compare with some of the other grayish dust motes) that the calibration process is having a challenge removing it completely during calibration, and it's leaving a light shadow of the dust mote in the subs, which later on become an issue during color balance.  Is there a calibration setting that can help remove completely the dust footprint?

By the way, when I super-impose my master flat with my luminance, the dust shadow from the luminance perfectly aligns with the shadow in the luminance, and all the other dust rings are corrected, it's just this one.

Also, when I create my flats, I use an illuminated panel for consistent lighting.  During the Master Flat creation process, I used Winsorized sigma clipping (as per Pixinsight tutorial when using light boxes) with values of Sigma Low 4 & Sigma High 2.

Thank you so much for your help,

Miquel

12
General / RGB + L and black edges
« on: 2011 October 10 10:46:29 »
Hi,

I'm evaluating a trial version of Pixinsight and so far it looks like an awesome package.

I'm trying to combine an RGB image with a Luminance image of M31, but as a result of calibration and registration, my RGB image has a black edge on the right side and the bottom side which throws off my DBE process, so I know that I need to get rid of them with the Dynamic crop tool.  But my Luminance has the black edge on the left and top sides (and it's a different width than the one of the RGB image), so when I remove the black edges for the RGB and then for the Luminance, I can't combine them anymore because it says that the geometry has changed.

I think I need to use this tool called dynamic alignment before I try to combine them, but I was not sure if I'm following the right steps, so if anybody could confirm that this is the most logical thing to do before DBE, I'll happy to go with the next step.

Thanks for your help,

Miguel

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