moonlight HDR - page 2 - Creative Uses of CHDK - CHDK Forum
« previous next »
Pages: 1 [2]   Go Down

moonlight HDR

  • 14 Replies
  • 18764 Views
*

Offline lukg

  • ***
  • 162
  • Eos 450D+18-55is+55-250is & Powershot S5is - 1.01a
Re: moonlight HDR
« Reply #10 on: 17 / June / 2008, 06:47:45 »
Advertisements
You can't remove fixed noise with averaging. Only random noise (eg. ISO noise) could be lowered.
Your problem is fixed noise caused by long exposure. (bad pixels are in the same places in all pictures)
Logged
*

Offline fbonomi

  • ****
  • 469
  • A570IS SD1100/Ixus80
    • Francesco Bonomi
Re: moonlight HDR
« Reply #11 on: 17 / June / 2008, 12:33:43 »
@Joshatdot, you have to do some "dark frame removal", I think.

This should help with:
1) pixels that are always white in ALL pictures (you sem to have a lot of them)
2) the light halo in the top left of the screen (usually it's caused by a component in the camera near to the sensor that heats up)

Logged
*

Offline fbonomi

  • ****
  • 469
  • A570IS SD1100/Ixus80
    • Francesco Bonomi
Re: moonlight HDR
« Reply #12 on: 17 / June / 2008, 13:00:00 »
45 frames, 60 secs exposure, ISO 100, with noise reduction, averaged:



The same frames, with brightening (the lightes pixels in each frame, are kept onto other frames)
This adds noise (not too visible at this small size) but saves the stars from being "averaged out"




EDIT: I forgot to add: the first shot was an HDR, this one isn't. I turned off the lights on the trees because htey were making my life too difficoult :-)
« Last Edit: 17 / June / 2008, 14:00:23 by fbonomi »
Logged
*

Offline Joshatdot

  • *
  • 20
  • A720 & A570 w/latest Autobuild
    • Joshatdot's Photobucket
Re: moonlight HDR
« Reply #13 on: 17 / June / 2008, 23:29:25 »
Logged
*

Offline fbonomi

  • ****
  • 469
  • A570IS SD1100/Ixus80
    • Francesco Bonomi
Re: moonlight HDR
« Reply #14 on: 18 / June / 2008, 00:19:59 »
sorry, fixed !!
Logged
Pages: 1 [2]   Go Up
« previous next »
 

Related Topics


SimplePortal © 2008-2014, SimplePortal