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+ | [[File:UltraHdr.png|thumb|left|316px]] |
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+ | {| align="right" style="border-collapse:collapse; font-size: x-small;" |
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+ | | __TOC__ |
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+ | |} |
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+ | This script provides a complete HDR / Exposure Bracketing environment for use with CHDK. |
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⚫ | It combines various aspects of many existing HDR scripts and will work on any CHDK equiped camera. It has no embeded keyboard presses or fixed parameter set variables that would make it specific to a particular camera. However, it is designed to run best with CHDK 1.2.0 or newer - see the bottom of this page for instructions on converting for CHDK 1.1.0. |
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− | [[File:UltraHDR1.png|thumb|300px|right]]<span style="font-size:13px;line-height:21px;"> |
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⚫ | |||
==Script Description== |
==Script Description== |
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− | + | The script allows the user to vary one of the three camera exposure parameters (Tv, Av, Sv) while holding the other two fixed. This results in several shots at different exposure settings, suitable for creating HDR images in your computer. |
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Note : as many Canon P&S cameras do not have adjustable aperature. |
Note : as many Canon P&S cameras do not have adjustable aperature. |
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+ | |||
+ | forum link > http://chdk.setepontos.com/index.php?topic=9557 |
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==Script Operation== |
==Script Operation== |
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− | ==Lua Script |
+ | ==Lua Script== |
+ | '''UltraHDR.lua''' : for CHDK v1.2.0 or greater (see note below) |
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<syntaxhighlight lang="lua"> |
<syntaxhighlight lang="lua"> |
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print("...done") |
print("...done") |
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</syntaxhighlight> |
</syntaxhighlight> |
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+ | |||
+ | |||
+ | ==Script Notes== |
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+ | |||
+ | For CHDK versions 1.1 or earlier, change the header of the script to the following : |
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+ | |||
+ | <syntaxhighlight lang="lua"> |
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+ | |||
+ | --[[ |
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+ | @title Ultra HDR |
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+ | |||
+ | @param m Mode [Tv=0,Ev=1,Sv=2] |
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+ | @default m 0 |
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+ | @range m 0 2 |
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+ | @param n Exposure Steps |
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+ | @default n 3 |
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+ | @range n 2 8 |
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+ | @param a 1/2 f-stops per Step |
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+ | @default a 2 |
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+ | @range a 1 10 |
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+ | @param e Exposure Offset [stops] |
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+ | @default e 0 |
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+ | @range e -4 4 |
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+ | @param r Raw/DNG [0=auto,1=off,2=on] |
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+ | @default r |
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+ | @range r 0 2 |
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+ | --]] |
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+ | |||
+ | </syntaxhighlight> |
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+ | [[Category:HDR]] |
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+ | [[Category:Bracketing]] |
Revision as of 03:52, 23 March 2013
This script provides a complete HDR / Exposure Bracketing environment for use with CHDK.
It combines various aspects of many existing HDR scripts and will work on any CHDK equiped camera. It has no embeded keyboard presses or fixed parameter set variables that would make it specific to a particular camera. However, it is designed to run best with CHDK 1.2.0 or newer - see the bottom of this page for instructions on converting for CHDK 1.1.0.
Script Description
The script allows the user to vary one of the three camera exposure parameters (Tv, Av, Sv) while holding the other two fixed. This results in several shots at different exposure settings, suitable for creating HDR images in your computer.
Note : as many Canon P&S cameras do not have adjustable aperature.
forum link > http://chdk.setepontos.com/index.php?topic=9557
Script Operation
The UltraHDR script has five parameters that can be set. These are :
- HDR mode - choose better shutter (Tv), Iris (Ev), or ISO (Sv).
- Exposure Steps - this determines the number of photos taken at different exposures.
- 1/2 f-stops per step - the exposure adjustment made between shots
- Eposure offset - allow you to shift the exposure of all shots up or down by a fixed amount.
- Raw - override current RAW setting (restored on script exit)
Lua Script
UltraHDR.lua : for CHDK v1.2.0 or greater (see note below)
--[[
@title Ultra HDR
@param m HDR Exposure Mode
@default m 0
@values m Shutter Iris ISO
@param n Exposure Steps
@default n 3
@range n 2 8
@param a 1/2 f-stops per Step
@default a 2
@range a 1 10
@param e Exposure Offset (stops)
@default e 0
@range e -4 4
@param r Raw & DNG
@default r
@values r Ignore Disable Enable
--]]
-- release AF lock & restore RAW state on exit
function restore()
if ( r>0 ) then set_raw(rawmode) end
set_aflock(0)
end
--setup
set_console_layout(1, 0, 45, 12)
rawmode=get_raw()
if( r>0 ) then set_raw(r-1) end
print("Ultra HDR started...")
-- switch to shooting mode
if ( get_mode() == false ) then
sleep(1000)
set_record(1)
while ( get_mode() == false) do
sleep(100)
end
end
sleep(100)
-- focus and take exposure
press("shoot_half")
repeat
sleep(50)
until get_shooting() == true
release("shoot_half")
repeat
sleep(50)
until get_shooting() == false
set_aflock(1)
av=get_av96()
sv=get_sv96()
tv=get_tv96()
-- configure the shots
print( "start","tv=", tv, "av=", av, "sv=", sv )
s=a*48
tv_inc=0
av_inc=0
sv_inc=0
if(m==0) then
tv=tv-n*s/2+e*96
tv_inc=s
elseif ( m==1 ) then
av=av-n*s/2+e*96
av_inc=s
elseif ( m == 2 ) then
sv=sv-n*s/2+e*96
sv_inc=s
end
--shoot
for i=1, n, 1 do
print(i, "tv=", tv, "av=", av, "sv=", sv )
set_tv96_direct(tv)
set_av96_direct(av)
set_sv96(sv)
shoot()
tv = tv + tv_inc
av = av + av_inc
sv = sv + sv_inc
end
restore()
print("...done")
Script Notes
For CHDK versions 1.1 or earlier, change the header of the script to the following :
--[[
@title Ultra HDR
@param m Mode [Tv=0,Ev=1,Sv=2]
@default m 0
@range m 0 2
@param n Exposure Steps
@default n 3
@range n 2 8
@param a 1/2 f-stops per Step
@default a 2
@range a 1 10
@param e Exposure Offset [stops]
@default e 0
@range e -4 4
@param r Raw/DNG [0=auto,1=off,2=on]
@default r
@range r 0 2
--]]