Get more dynamic range with Magic Lantern dual ISO

Stripey image crazyness. work in progress...

Below cr2hdr20bit is a unix (osx) executable.

Not the easiest but in my head the best way to install these tools. *not yet tested on a clean machine

Copy to your binary directory.

chmod +x cr2hdr20bit

get and install the exiftool package.

http://www.sno.phy.queensu.ca/~phil/exiftool/

sudo port install dcraw

(assuming you have macports)

Basic execution is pretty simple:

cr2hdr20bit *.CR2

Run it without arguments for help.

It is fairly smart and can recognise whether a CR2 file is dual iso or not and skip accordingly.

Not multithreaded, but we can solve that..

Put this in a script file, it assumes that you are working on files that have sequential numbers on the end (just like what comes out of your camera).

#!/bin/bash

CORES=$(sysctl -n hw.ncpu)

if [ $CORES -ge 8 ]

then

    echo "8 or more cores"

    sleep 2

    cr2hdr20bit *[1].CR2 &

    cr2hdr20bit *[2].CR2 &

    cr2hdr20bit *[3].CR2 &

    cr2hdr20bit *[4].CR2 &

    cr2hdr20bit *[5].CR2 &

    cr2hdr20bit *[6].CR2 &

    cr2hdr20bit *[78].CR2 &

    cr2hdr20bit *[90].CR2 &

    wait

elif [ $CORES -ge 6 ]

then

    echo "6 or more cores"

    sleep 2

    cr2hdr20bit *[1].CR2 &

    cr2hdr20bit *[2].CR2 &

    cr2hdr20bit *[34].CR2 &

    cr2hdr20bit *[56].CR2 &

    cr2hdr20bit *[78].CR2 &

    cr2hdr20bit *[90].CR2 &

    wait

elif [ $CORES -ge 4 ]

then

    echo "4 or more cores"

    sleep 2

    cr2hdr20bit *[123].CR2 &

    cr2hdr20bit *[456].CR2 &

    cr2hdr20bit *[78].CR2 &

    cr2hdr20bit *[90].CR2 &

    wait

elif [ $CORES -ge 2 ]

then

    echo "2 or more cores"

    sleep 2

    cr2hdr20bit *[123].CR2 &

    cr2hdr20bit *[456].CR2 &

    cr2hdr20bit *[78].CR2 &

    cr2hdr20bit *[90].CR2 &

    wait

else

    echo "too bad just one core"

    sleep 2

    cr2hdr20bit *.CR2

fi