How to increase JPG quality via autoexec.ash?

valdi99

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Looks like we can do that. Max exposure time is 8s. Took it out from the HDR script from nutsey:

Code:
#1 == 7.9s; 50 == 6.1s; 100 = 4.6s
t ia2 -ae still_shutter 1

Could it be done with video shutter? I would need 1/60sec.
 

funnel

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Good to know, thanks. 0x7FF. Could be useful to find how to make an even longer exposure than 8s.
 

luckylz

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Can I just fixed the ISO setting, and let the Yi Cam decide the shutter speed?
 

nutsey

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Could be useful to find how to make an even longer exposure than 8s.
Longer exposures can be effective with the Yi cam, concerning we can easily modify the case to cool the sensor down :).
 

luckylz

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I took some test photo with Yi Cam at ISO25600, just for fun.
Code:
#1200 == 1/83s
t ia2 -ae exp 25600 1200
And then stack 50 pic(average) for de-noise, looks much better.

ISO25600 resize to 50%:
ISO25600-Resize.jpg
ISO25600 stack 50pictures & resize to 50%:
ISO25600-Resize-Stack.jpg
ISO25600 origin vs. stack 100%:
ISO25600-100%.jpg
 
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huhu2207

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luckylz

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I use a PS plug-ins call [StarsTail] average mode [平均值] which made by a Chinese guy from www.StarsTail.com
In simple way, after you load all the pictures by [load file in stack], then just change the opacity of each layer.
For example, if you load 10 pictures, just change the opacity from the top to bottom as:
10%, 11%, 12%, 14%, 16%, 20%, 25%, 33%, 50%, 100%
stack to de-noise.png

Due to the noises are random, change the opacity, is to make every pixel average value from all layers, then then random noise will be reduced.

I think this is very useful, when you shoot at night with high ISO (even low ISO does work)
 

Kontoll

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I took some test photo with Yi Cam at ISO25600, just for fun.
Code:
#1200 == 1/83s
t ia2 -ae exp 25600 1200
And then stack 50 pic(average) for de-noise, looks much better.

ISO25600 resize to 50%:
View attachment 14106
ISO25600 stack 50pictures & resize to 50%:
View attachment 14107
ISO25600 origin vs. stack 100%:
View attachment 14108

how do we know that 1200 in autoexec corresponds to 1/83s shutter speed? is there any formula to calculare it?
 

kopidoo

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So the changes remain permanant or temporary?
I want to reduce noise reduction...
 

wawanadie

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Looks like we can do that. Max exposure time is 8s. Took it out from the HDR script from nutsey:

Code:
sleep 8
#SET ISO TO 100
t ia2 -ae exp 100 0 0
sleep 1
#1 == 7.9s; 50 == 6.1s; 100 = 4.6s
t ia2 -ae still_shutter 1

is it possible to change ISO? 1800, 6200 or above?
 

nutsey

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There was an experiment with ISO 25600 in this thread.
 

pmrg

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Hello,

Can anyone let me know how to work with "Scene mode control" what does the script values do ?

nutsey scripts have:

#enable 14 scene mode
t cal -sc 14

but what is it ?!

cheers
 

nutsey

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It sets scene mode N14 (have no idea how it's called, but it provides better picture for me), you can try any of them changing the value from 0 to 23, but they seem rather useless.
 
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