PixInsight Forum (historical)

PixInsight => General => Topic started by: mash.m on 2014 September 27 03:24:00

Title: extracting just the red channel (without debayering) from a canon CR2 raw file?
Post by: mash.m on 2014 September 27 03:24:00

Hi,

i have taken some halpha Images with my dslr. now i wan to extract only the red chnaell wihtout debayering. i know that there is the BatchChannelExtraction, but when i load one or more cr2 raw´s and start the extracting - nothing happen. the cpu load goes a Little higher for some time and the hourglass come up for some seconds. but no file at the Destination Folder.

any ideas?

thanks markus

Title: Re: extracting just the red channel (without debayering) from a canon CR2 raw file?
Post by: Ignacio on 2014 September 27 06:49:48

Try SplitCFA.

Ignacio

Title: Re: extracting just the red channel (without debayering) from a canon CR2 raw file?
Post by: MikeOates on 2014 September 27 08:03:35

Hi Markus,

Last year I posted a workflow for narrowband imaging with a DSLR, there are probably different tools available now like Ignacio mentions (SplitCFA) but you may find it useful:

http://pixinsight.com/forum/index.php?topic=5748.msg39771#msg39771 (http://pixinsight.com/forum/index.php?topic=5748.msg39771#msg39771)

Mike

Title: Re: extracting just the red channel (without debayering) from a canon CR2 raw file?
Post by: mash.m on 2014 September 27 10:16:38

Hi,

splitcfa sounds good, but doesn´t work:

Output from pi:

File 1 of 1
Open D:/ServerFolders/Bilder/Hobby/Markus/IC1396/hAlpha/IMG_5469.CR2
Wrong image dimension: odd width [5202] or height [3465].
Close D:/ServerFolders/Bilder/Hobby/Markus/IC1396/hAlpha/IMG_5469.CR2

Markus

Title: Re: extracting just the red channel (without debayering) from a canon CR2 raw file?
Post by: Ignacio on 2014 September 27 12:42:46

Quote from: mash.m on 2014 September 27 10:16:38

Hi,

splitcfa sounds good, but doesn´t work:

Output from pi:

File 1 of 1
Open D:/ServerFolders/Bilder/Hobby/Markus/IC1396/hAlpha/IMG_5469.CR2
Wrong image dimension: odd width [5202] or height [3465].
Close D:/ServerFolders/Bilder/Hobby/Markus/IC1396/hAlpha/IMG_5469.CR2

Markus

That's odd, I use it all the time with no problem. Make sure you have RAW set to monochrome CFA, it might make a difference.

Ignacio