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Topics - star gazer

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When I open my Canon 7D Raw images and then user the ScreenTransferFunction's nuclear button. The image is displayed as sky blue. I don't think this is quite right. I think there is a setting for how the bayer colour matrix is interpreted, but I may be wrong. I think there is an option to configure the RGBR sequencing when the file is processed. Can someone put my out of my misery.

Many thanks

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General / What causes this ?
« on: 2012 November 17 09:25:07 »
Does anyone know what causes this when I process my images?



This is my workflow:

1. convert CR2 to Fits
2. Create master dark
3. Image calibration
4. Debayer
5. Star alignment
6 image integration

The image is the result of step 6 without doing anything else in PI and is a 2:1 crop before STF or any stretching takes place


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Bug Reports / BatchPreprocessing script disappeared
« on: 2012 April 30 23:29:28 »
Reposting this post since I posted into the wrong group

I installed the new BatchPreprocessing script (OS X) and there it was. Selected the menu option and launched the script all was fine. Didn't actually do anything with the script  (was going to have a proper play this evening) went to launch the script this evening and it has disappeared. Somehow I did managed to crash PI -may be that's why it's gone. Anyone know how to get the script back?

Many thanks

4
I installed the new BatchPreprocessing script (OS X) and there it was. Selected the menu option and launched the script all was fine. Didn't actuall do anything with the script  (was going to have a proper play this evening) went to launch the script this evening and it has dissapeared. Somehow I did managed to crash PI -may be that's why it's gone. Anyone know how to get the script back?

Many thanks

5
General / Star Alignment - need at least 6 stars
« on: 2012 March 12 00:46:14 »
Running StartAlignment the process windows states that it has found 50867 stars, but then the alignment process errors out saying 0 star(s) found - need at least six stars.

Clearly there are enough stars, so what could be causing this error?

Thanks for your help

Tim

6
General / RAW conversion settings for .CR2 files
« on: 2012 February 04 09:08:55 »
I my previous thread, I was given advice on setting the DSLR conversation preferences. The advice was to tick the "Create RAW Bayer image" and to set "No black point correction".

When I do this the image becomes very green. I understand that a bayed image has 2G pixels for every 1R and 1B. However doesn't running the de-bayering restore the image to the "correct" colour balance??

After de-bayering, my image is too green especially when the auto screen transfer function is applied. Now I was also given advice to unlock the colour channels before applying the automatic stretch. Fine, no problem, the image then has a better colour balance, but now I cannot tweak the screen transfer function without upsetting the colour, even if i the "re-lock" the channels.

You might say 'don't worry as the screen transfer function as it is only for a temporary view'. Yes that is true, but with the resultant "green" image, life is very much more difficult when it comes controlling colour when I permanently stretch the histogram.

Now for my real question: What is the purpose of the Interpolation options on the Raw Format Preferences dialog? If I ignore the recommended settings (first paragraph above), what am I doing?

I have found that un-ticking everything in the RAW preferences dialog and choosing the Bilinear radio button, it is much easier to control the colour. Again what am I doing here? Am I converting a CR2 file into de-bayered FIT, so further down my workflow I don't need to de-bayer? What are the disadvantages of working this way? What about the other Interpolation options? When would one use them?

Sorry for so many question, but converting RAW files is a bit of a mystery to me.

Thanks...

7
I'm new to PI, but have already had some success.

Today though I am getting an message that I don't remember on my previous runs.

The Dark scaling factors are set to 0 and I get a warning 'No correlation between the master dark and the target frame'. Does this mean that i should set the scaling so that the frames correlate? Not sure how?

The reason for asking is that I haven't managed to get a good result in terms of dark frame subtraction so far.

I think I need a little help.

I'm using a DSLR with the darks and light with the same duration and iso, and roughly the same temperature.

Any advice?


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