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Best CHDK tips for the Orionid meteor shower this Sunday ?

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Offline blackhole

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Re: Best CHDK tips for the Orionid meteor shower this Sunday ?
« Reply #10 on: 20 / October / 2012, 03:15:28 »
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Wow, you're really fast, thank you very much!

I tried the script and running without any problems. During the day I still thoroughly tested.
Thank you again  ;)

EDIT:
I have added the option of turning off RAW.
I did it in the simplest way:

@param r Raw On/Off (1=On/0=Off)
@default r 1
@param n Number of Shots
@default n 1000
.
.
.
set_raw(r) -- enable RAW or DNG
« Last Edit: 20 / October / 2012, 03:57:39 by blackhole »

Re: Best CHDK tips for the Orionid meteor shower this Sunday ?
« Reply #11 on: 20 / October / 2012, 08:10:36 »
I have added the option of turning off RAW.
I was wondering about doing that as my old G10 has a really big sensor (even by today's standard) and produces a 22.5 Mb file when shooting a DNG.  You can eat up even a big SD card pretty quickly at that rate.

What I was not sure about is how well you can post-process and apply "dark frame subtraction" in software if you create only only JPG files.    I guess it should be fine for correcting "amp glow" but maybe not vor individual pixels that go "hot" on long exposures ? 

Have you tried it with jpegs only ?

I'll add your changes and update the script that I posted above.  Once we have both had time to test outdoors I'll probably move it to a CHDK wiki page.
Ported :   A1200    SD940   G10    Powershot N    G16

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Offline blackhole

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Re: Best CHDK tips for the Orionid meteor shower this Sunday ?
« Reply #12 on: 20 / October / 2012, 09:12:26 »
Quote
Have you tried it with jpegs only ?

I tried with jpg files and the result was not significantly worse.
After dark frame subtraction, further processing work in Pixinsight program where I can remove the remnants of noise separated per channels RGB (SCNR function), when that part is completed in Photoshop I remove the remains of Ampglow (Image> Adjustments> Selective Colors> Magentas) equalizes background (Color sampler tool) and adjust the histogram.
If there's still noise,very carefully use a Noiseware plugin.

Re: Best CHDK tips for the Orionid meteor shower this Sunday ?
« Reply #13 on: 20 / October / 2012, 09:17:42 »
After dark frame subtraction, further processing work in Pixinsight program where I can remove the remnants of noise separated per channels RGB (SCNR function), when that part is completed in Photoshop I remove the remains of Ampglow (Image> Adjustments> Selective Colors> Magentas) equalizes background (Color sampler tool) and adjust the histogram. If there's still noise,very carefully use a Noiseware plugin.
Guess I'm going to have to study how to do the same workflow in GIMP.
Ported :   A1200    SD940   G10    Powershot N    G16


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Offline lapser

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Re: Best CHDK tips for the Orionid meteor shower this Sunday ?
« Reply #14 on: 20 / October / 2012, 10:52:37 »
Attached is CHDK with native calls enabled for G1X_100g, if you use this camera.
THANKS!!
EOS-M3_120f / SX50_100b / SX260_101a / G1X_100g / D20_100b
https://www.youtube.com/user/DrLapser/videos

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Offline blackhole

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Re: Best CHDK tips for the Orionid meteor shower this Sunday ?
« Reply #15 on: 20 / October / 2012, 16:10:55 »
Quote
Guess I'm going to have to study how to do the same workflow in GIMP.

Here you have the basic instructions for the GIMP, I hope that it will help.
http://synergous.com/flatpress/?x=entry:entry111126-201738

Re: Best CHDK tips for the Orionid meteor shower this Sunday ?
« Reply #16 on: 20 / October / 2012, 16:20:32 »
Here you have the basic instructions for the GIMP, I hope that it will help.
http://synergous.com/flatpress/?x=entry:entry111126-201738
Wow - thanks !
Ported :   A1200    SD940   G10    Powershot N    G16

Re: Best CHDK tips for the Orionid meteor shower this Sunday ?
« Reply #17 on: 20 / October / 2012, 17:10:06 »
Hi, just band new to CHDK (Today!) I was looking for a way to take pictures of the meter shower tonigh. I got CHDK working, and I was hoping to make a script that would combine motion detection with long exposure. I found two scripts on this site, and was hoping for some help. The .lua script looks easier to understand, but the long exposure script is only in bas. These are the two scripts I wanted to combine:

@title Motion Detect

a=6
b=6
c=1
d=300000
e=200
f=5
g=1
h=0
i=0 
j=0
k=0
l=0
m=0
n=0
o=2
p=0

do

md_detect_motion a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p

if( h > 0 ) then
   shoot
endif

until (0)

-----------------------
and long exposure
---------------------
rem Author - Keoeeit
rem ReAuthor - Chuck
rem USE WITH CAUTION
rem do not run for many hours or days
@title Non-stop Long Exp Timelapse
@param a Interval (Minutes)
@default a 0
@param b Interval (Seconds)
@default b 30
@param c Interval (10th Seconds)
@default c 0
@param d Initial Delay (Seconds)
@default d 3
@param e Noise reduction (0=auto 1=off 2=on)
@default e 1
@param f Capture Raw Image (0 or 1)
@default f 1
@param g ISO (-1=hi,0=auto,1=80,..,5=800)
@default g 1

t=a*60000+b*1000+c*100

if t<100 then let t=5000

n=1

print "Interval shooting."
print "Until you interrupt it."
print "Use with caution."

sleep d*1000

rem Display mode off
rem 181 Display mode (Valid for record mode only) 0 = Show info icons, 1 = Do not show info icons, 2 = LCD is off, 3 = EVF.
rem This didn't seem to work for the A560
set_prop 181 2

goto "shot"

:shot
  print "Shot number", n
  set_raw_nr e
  set_raw f
  set_iso g
  set_tv96_direct -576
  shoot
  n=n+1
  sleep t
goto "shot"
---------------------------
I have a Canon ELPH Powershot 300HS. Any assistance would be appreciated.  TIA


Re: Best CHDK tips for the Orionid meteor shower this Sunday ?
« Reply #18 on: 20 / October / 2012, 17:16:18 »
I was looking for a way to take pictures of the meter shower tonight. I got CHDK working, and I was hoping to make a script that would combine motion detection with long exposure. I found two scripts on this site, and was hoping for some help.
In my experience,  motion detection capability varies a lot between cameras .. somewhat due to the quality of the CHDK port.  If you really want meteor pictures tonight then "tuning" MD to  only react to meteors  is going to be a big job.  Maybe not even possible.

The other approach is to take as many pictures as possible and look for the random moments when you actually capture a meteor trail.

Ported :   A1200    SD940   G10    Powershot N    G16

Re: Best CHDK tips for the Orionid meteor shower this Sunday ?
« Reply #19 on: 20 / October / 2012, 17:45:30 »
Which script would you recommend for that? I was hoping to see some meters last night to do some testing, but that didn't happen, so now I'm on a time crunch.  :(  Most of the scripts I've seen adjust time between shots, but I've not seen anything about adjusting exposure times (or perhaps I don't know what I'm looking for.)

[EDIT] What's the point of taking dark frame pics? Does that help in Photoshop?
« Last Edit: 20 / October / 2012, 17:49:02 by MeBeJedi »

 

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