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Messages - javajunkie2121

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1
General / Re: Linear Fit Question
« on: 2017 August 17 08:01:33 »
 thanks for the reply Rodd. I've had success, i think, with matching luminance and extracted luminance from RGB with linear fit as well.

But I'm just wondering how people feel about the argument that you are diminishing the final lightness contribution from the master luminance by using linear fit to equalize lum and RGB in the final LRGB when actually you want to highlight/rely on the master luminance lightness more heavily in the final LRGB?
jeff

2
General / Linear Fit Question
« on: 2017 August 16 17:36:36 »
Hi:

I've seen some tutorials suggest using linear fit on the (stretched) L channel of the Master RGB to match it to the Master Luminance before LRGB combination.

I've also seen a tutorial suggest that linear fit should just be used to match the linear (nonstretched) Master-Lum and Master-R and Master-G and Master-B before linear RGB combination, but not to repeat it at the LRBCombination step as you want the brightness to reflect primarily the Master-Lum

I'm wondering what most folks do?

jeff

3
General / RGBWS Question
« on: 2017 August 16 17:30:42 »
Hi:
I've seen tutorials mention using RGBworkspace to set the R:G:B ratio if extracting the luminance from an RGB master to use either as a mask or to use linear fit to equalize the luminance portion of the RGB master with the Lum master.

Do folks do this?  If so, you set the R:G:B contribution to 1:1:1 and also need to lower the gamma setting to 1.0 and de-select the sRGB setting?

jeff

4
General / Re: Using the New PCC Tool
« on: 2017 August 14 17:49:32 »
Hi Bob:  I have tried to reset the STF after using PCC, but can't get rid of the green background.  So, if I do PCC single step with BN checked within the process, I got a good result, but if I run PCC on a file that had BN previously, it looks awful...nmot sure what I'm doing wrong, but the background won't reset.

I was starting with a master sub that had DBE and BN applied...so no significant gradient and neutral background

jeff

5
General / Re: Using the New PCC Tool
« on: 2017 August 11 18:34:14 »
Hi Robert,
You can do one step process checking Background Neutralization in PhotometricColorCalibration tool and selecting a Region of Interest of the image as reference of the background or you can do a two steps process by unchecking Background Neutralization in PhotometricColorCalibration tool and using Background Neutralization before PhotometricColorCalibration tool.
To be sure your background is correctly neutralized, use STF tool linking the channels and aplying autoSTF. You have to see a neutral background. If you see a predominance in one or other color, something was wrong. 
Saludos, Alejandro.

Hi:  I tried using PCC both ways.  When used as a sinfgle step with Background Neutralization box checked, works fine..but when I used PCC on the same image that had BN previously applied, I got a horrible green cast.  Not sure what I am doing wrong?
jeff

6
yes Chris...was doing a medium dither via PHD2/SGPro with subs

jeff

7
General / Re: Some issues in latest PI release
« on: 2017 August 05 08:54:27 »
same issue for me on Win 7 and Win 10 PCs..extract Luminance missing, resetting tool bar did not help

jeff

8
Hi Chris:  I tried this with 12 blue subs of M51, 2 of which had star trails. I left the layers/growth values for high large scale structure pixel rejection at defaults of 2

..as soon as I start increasing the pixel rejection sigma low/high values from default 4/3(windsorized sigma clip), I get star trails returning?

also I tried adding "low large scale structure" rejection to high large scale structure rejection with sigma low/high back at defaults...compared to high structure rejection alone I think I'm seeing some loss of detail in the galaxy?  Is the low large scale structure intended for other targets?

jeff

9
I just downloaded 1.8.5. I'm trying to remove a satellite trail from an image.

Is there a quick start user guide for large scale rejection? I'm trying to use it in ImageIntegration but it doesn't seem to have any effect on an image stack containing 4 images with 1 image with a satellite trail. Layers/Growth are set to 3 and 4, reject high large-scale structures is clicked.

Doug

I second Doug's request..this is a VERY useful update and will be VERY popular..if someone would please give some guidance on settings that would be wonderful

I'm seeing a better identification of multiple trails in the high_rejection map and a better end integrated image using 12 images (2 with satellite trails) and  using the default 2/2 for layers growth.  Not sure if number of subs is reason it's working better.  I did not change the pixel rejection sig low (4) and high (3) default settings.  I tried it on a 30 sub integration with 4 known bad subs with trails..rejection map looks awesome..but end result looks same..maybe original algorithm was smart enough when there are 30 subs to eliminate trails.

I am unclear though on the role of the "reject low large-scale structures" setting when trying to eliminate bright satellite trails?  I've run the integration with and without it and I'm not detecting a difference?

jeff

10
General / DBE: repeat vs push tolerance
« on: 2017 May 07 14:14:19 »
Hi:

I've had some tough gradients (usually RGB) that are hard to get rid of with DBE, even if I push the tolerance to >1.7. Splitting channels and doing separate DBE on each color master seemed worse.

If you desire more gradient removal..is it better to do one application of DBE and push tolerance higher (assuming you are not seeing loss of real, desired signal), or is it better to keep tolerance lower and do more than one DBE application?

jeff

11
Image Processing Challenges / Re: M15 bad background
« on: 2016 August 09 17:31:52 »
Alejandro:  this was incredibly helpful..thank you!  Really creative approach to processing

would you please comment on use of star alignment structure map rather than star mask to create some of these masks in this processing?  I'm trying to learn when to choose that over star mask?

same for wavelet layers vs. range masks?

jeff

12
General / Deconvolution Wavelet Regularization settings
« on: 2016 August 09 17:23:48 »
Hi:  I've seen some processing examples using deconvolution where the wavelet regularization settings are changed from default (using the Regularized Richardson-Lucy algorithm)...I can't find documentation about these settings (Gaussian vs Poisson and # of wavelets and settings per wavelet for noise threshold and noise reduction)

any advice about tweaking these settings during processing?

jeff

13
Image Processing Challenges / Re: Newbie Processing Help
« on: 2016 July 26 09:28:26 »
Hi Manoj, the banding can be removed using CanonBandingReduction script. You have to rotate the image 90ยบ, apply it and then rotate back. Here is my try with your image.
Hope this helps
Saludos, Alejandro.

Alejandro:  thanks for this processing example post!..it was really helpful to see the steps.

Quick question:  I noticed that you: cloned the Syn_Lum_Master image to use as mask protecting the background during the LRGBCombination.  I haven't seen a mask used before..was that because of the MorphTransformation work on each R,G,B channel to reduce stars etc? Or is that something you do regularly?

jeff

14
I'm also curious about the order of deconvolution and linear noise reduction for LRGB CCD images...I've seen a couple older references that mention linear noise reduction first, while others have deconvolution first?

jeff

15
awesome..thanks for the quick reply Alejandro

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