How to edit the exposure of an HDRI image using GraphicsMagick and Node.js? -

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i have imagemagick installed support hdri images. using bash, following command can used save image different number of 'stops' (where stops measure of exposure):

stops=`convert xc: -format "%[fx:pow(2,-1)]"` convert input.exr \     -colorspace rgb \     -function polynomial "$stops,0" \     -gamma 1 \     -colorspace srgb \     output-minus-one-stop.jpg

in order node.js, translation needed:

var stops = math.pow(2, -1); gm('input.exr').colorspace('rgb')     .out(`function polynomial "${stops},0"`)     .gamma(1, 1, 1)     .colorspace('srgb')     .write('output-minus-one-stop.jpg', function(err){});

however error:

command failed: convert: unable open image `function polynomial "0.25,0"': no such file or directory @ error/blob.c/openblob/2702 convert: no decode delegate image format `25,0"' @ error/constitute.c/readimage/501

the error happening because of line:

.out(`function polynomial "${stops},0"`)

what's correct way format out command in example?

i don't speak node, familiar imagemagick.

the gm have looks (to me) graphicsmagick rather imagemagick (the 2 different) , don't think graphicsmagick has -function polynomial.

can move im rather gm? may wrong on either count - , happy corrected if knows better.


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