Posted by
Patrick on
Oct 23, 2015; 8:08am
URL: http://astroimagej.170.s1.nabble.com/Canon-RAW-images-in-AIJ-tp280p288.html
Hi,
I have a similar problem. I converted my Canon raw images with 'rawtran' (
http://integral.physics.muni.cz/rawtran/). The output is a 16 bits fits format with a slice (stack) for each channel (RGB). rawtran uses dcraw for its conversion.
I noticed that the result differs per computer. On my computer at home (linux mint) I did exactly the same conversion as at my work (ubuntu linux) with both the same tools (rawtran and dcraw). When I load the fits image in ImageJ and measure the image, the results differ slightly even though the original CR2 file is exactly the same.
The images I used were flat-fields made with my camera.
Here the results from my home computer:
Label Mean StdDev Min Max
IMG_0187.fits:1 33105,518 1441,352 13574 65535
IMG_0188.fits:1 32777,633 1441,279 13295 65535
Here the result from my work computer:
Label Mean StdDev Min Max
IMG_0187.fits:1 33094.344 1442.181 13554 65535
IMG_0188.fits:1 32781.888 1439.457 13294 65535
I did the conversion as follows:
rawtran -o IMG_0187.fits IMG_0187.CR2
rawtran -o IMG_0188.fits IMG_0188.CR2
I opened the fits images in ImageJ and pressed CTRL+M (Measure).
Does anyone know how it is possible that the output differs per computer?
Does converting with other tools also cause these differences in the results?
I hope someone can answer my questions.
Kind regards,
Patrick