Dark Frame Substraction

redstone · 31st August 2006

Hi, anyone can advise the methods and software to perform such an operation?

Thanks

weixing · 1st September 2006

Hi,
You can use Photoshop Layer and Apply Image (Select Subtract Blending). You can also use IRIS.

Have a nice day.

redstone · 1st September 2006

Hi, tried photoshop and didn't really work

weixing · 1st September 2006

Hi,

Originally Posted by redstone

Hi, tried photoshop and didn't really work

Hmm... Althought it's won't remove all the noise, but I try and it remove quite a number of them. Is the dark frame taken at same setting (same ISO and same exposure) as the image?? You can use the preview to see the different. What is the image format you use for both??

Below is my image example which use photoshop layer and subtract:
Original Image:

Dark Frame:

Result - After dark frame subtraction:

See the different?? No other processing had been done except the dark subtraction.

Have a nice day.

31st August 2006	#1
redstone Senior Member Join Date: Aug 2005 Location: Beyond the outer limits Posts: 2,766	Dark Frame Substraction Hi, anyone can advise the methods and software to perform such an operation? Thanks __________________ redstonean.deviantart.com \| www.flickr.com/photos/redstonean/ What signature? This? Here?

1st September 2006	#2
weixing Member Join Date: Feb 2005 Posts: 382	Re: Dark Frame Substraction Hi, You can use Photoshop Layer and Apply Image (Select Subtract Blending). You can also use IRIS. Have a nice day.

1st September 2006	#3
redstone Senior Member Join Date: Aug 2005 Location: Beyond the outer limits Posts: 2,766	Re: Dark Frame Substraction Hi, tried photoshop and didn't really work __________________ redstonean.deviantart.com \| www.flickr.com/photos/redstonean/ What signature? This? Here?