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Messages - Rod771

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Thanks Jim

So to confirm , the files exported to <output-dir>/calibrated/light/bayer  during BPP are never selected in Image Integration or Drizzle Integration. Only use files in <output-dir>/calibrated/registered/bayer.

Guys, I keep coming back to this when process my under sampled data.

I must have missed something? When generating a bayer drizzle image, when do you use the files in <output-dir>/calibrated/light/bayer. ? It says the Drizzle integration tool will use thm , however Step 7 in the OP says "After ImageIntegration, open the DrizzleIntegration tool. Select the same .drz files on the <output-dir>/registered/bayer directory" These are the registered file that Image Intergration used. Just confused a bit.



Gallery / Re: Pleiades widefield
« on: 2015 April 25 18:07:27 »
Beautiful image , congratulations!

Gallery / Re: Messier 45
« on: 2014 November 14 02:18:24 »
Awesome image ! Well done.

Thanks for the feed back guys  :)

I have re processed the image following your suggestion Vincent. It worked, I was able to retain colour in the core.



Incredible result.

Well Done Mike, thanks for sharing  :)

Gallery / Re: My first Rosette
« on: 2014 March 19 03:16:54 »
Nicely done Rodney!

Great result for a first attempt, outstanding  :)



Image Processing Challenges / M42 HDR Tool leaves mono core
« on: 2014 February 15 23:08:24 »
Hi everyone!

I have some data on M42 and have tried to create an image using the HDR tool. I have tried it a few times and always seem to end up losing detail and colour in the core.

The data was acquired using a C11 Edge HD with a Hyperstar lens and a Canon 60Da. I have taken 3 sec subs for the core and 30, 60 and 90 second subs for the rest of the dynamic range.

I have intergrated and calibrated each exposure and have applied DBE. The files can be found in the link below, please have a try and see if the core can be tamed. In my result I think I may have clipped the bright data when stretching?

I have attached and Jpeg of my result for reference.



General / Re: HDR composition error
« on: 2014 February 04 05:51:19 »
Hi Georg

Yes all the images were linear.

But, good news! I have it sorted  :) I lowered the Binarizing threshold down to 1.00 and the tool worked perfectly.



General / HDR composition error
« on: 2014 February 04 02:51:22 »
Hi Everyone

I'm trying to create a HDR image using four images of different exposures. An error pops up saying "bad linear fit,channel 0". Does this mean I have a problem in the red channel somewhere?

I have tried running the tool 4 times each with only 3 images by removing a different exposed image each time, hoping to find which image is creating the error but the error pops up every time.

I have also adjusted the binarizing threshold which made I slight difference - Instead of the error the tool produced an image but aborted after intergrating 3 images.

The images have been registered with each other using the star alignment tool. DLSR images.

Any help would be very appreciated



General / Re: Batch processing help DSLR
« on: 2013 July 28 02:34:14 »
Thanks for the tip Mike



General / Re: Batch processing help DSLR
« on: 2013 July 25 18:06:03 »
Rod. I have used flats from various screens. More recently a Samsung Galaxy - with no deleterious effect.

The streaks in your image are most likely  produced by images too closely aligned during acquisition. The effect is pronounced with a small amount of drift between images. Irrespective of mismatched calibration frames, the effect can be eliminated by dithering all your images during acquisition by 10 - 15 pixels.

Dithering will resolve a large proportion of your current difficulties. But dithering must be agressive with DSLRs.

Flats - about 70 - 75% on your camera preview histogram is about right for starters.

There is a tendency to get bogged down in the detail. Unless you dither your shots you will spend all your time post processing artifacts out, which can be minimized by basic acquisition techniques.

Thanks Rowland  :)

I've been concentrating on the flats because my image seemed to get worse after apply them. I originally just integrated the un calibrated lights had the result wasn't too bad.

But yes, shots weren't dithered and is a concern. I printed this off last week.  ;)  , I will implement it the next time I'm out , big thanks  :)

General / Re: Batch processing help DSLR
« on: 2013 July 25 17:48:21 »

Glad I could help. Yes that is the type I mean, the one I use is this They can be cut to size and with a bit of DIY I made this:

I used translucent plastic (2 sheets) to diffuse the light even more, the card cutouts are just to space the sheets, this fits on the end of the scope and I don't need to move the scope to take the flats. Works fine with the Astronomik CLS-CCD filter and Astrodon 5nm Ha, not tested with other filters yet. At f5 I give 0.3s exposure ISO100 with the CLS and 5 seconds ISO200 for the Ha.

Great work Mike, I will look into that, thanks

I had read your HA thread and will keep an eye on it  :)

General / Re: Batch processing help DSLR
« on: 2013 July 25 17:44:03 »
the blues are still way overexposed in those new flats. you want those histograms all in the middle of the display.

Cheers Rob,

 I'm finding the blue channel hard to control (possibly due to the F2 ratio??). The pink screen definitely helps the red channel as you've proved but the blue is still very strong. I've experimented with the screen colour by lowering the blue values thus creating a mustard/orange colour. It did bring the blue back in line with red and green but am i getting way off track? I've haven't heard or read of anyone using mustard colour light sources for flats.  ???

General / Re: Batch processing help DSLR
« on: 2013 July 25 06:23:17 »
Hi Mike

Thanks for the tips  :) . I appreciate it.

Is this the type of Light panel your referring to, click here

I have tested the 60Da for light leaks as per your procedure and I'm please to say it has none. Great idea, thanks, its good to rule out possible problems .  :)

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