Legacy ImageMagick Discussions Archive

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I am using IM 7.0.7.21 Q16 Mac OSX Sierra. I am trying to do a particular computation that requires HDRI to permit negative values. I get one result saving separate steps to mpc and another result when trying to make it into one command line using either mpr: or clones. Reference: https://stackoverflow.com/questions/483 ... ize-in-ima

Code: Select all

T="65000"
sigma=5
magick logo: I.mpc
magick I.mpc -blur 0x$sigma G.mpc
magick I.mpc G.mpc +swap -define compose:clamp=off -compose minus -composite \
G.mpc +swap -define compose:clamp=off -compose divide -composite D.mpc
M=`magick D.mpc D.mpc -define compose:clamp=off -compose multiply -composite \
-evaluate pow 0.5 -evaluate multiply $T -format "%[fx:maxima]" info:`
M2=`magick xc: -format "%[fx:2*$M]" info:`
magick D.mpc -evaluate add $M -evaluate divide $M2 -evaluate multiply $T output.png

But when doing either:

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T="65000"
sigma=5
magick \
\( logo: -write mpr:imgI +delete \) \
\( mpr:imgI -blur 0x$sigma -write mpr:imgG +delete \) \
\( mpr:imgI mpr:imgG +swap -define compose:clamp=off -compose minus -composite \
mpr:imgG +swap -define compose:clamp=off -compose divide -composite -write mpr:imgD +delete \) \
\( mpr:imgD mpr:imgD -define compose:clamp=off -compose multiply -composite \
-evaluate pow 0.5 -evaluate multiply $T \) \
\( mpr:imgD -evaluate add "%[fx:v.maxima]" -evaluate divide "%[fx:2*v.maxima]" \
-evaluate multiply $T \) -delete 0 output2.png

or

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T="65000"
sigma=5
magick \
logo: \
\( -clone 0 -blur 0x$sigma \) \
\( -clone 0,1 +swap -define compose:clamp=off -compose minus -composite \
-clone 1 +swap -define compose:clamp=off -compose divide -composite \) \
-delete 0,1 \
\( -clone 0 -clone 0 -define compose:clamp=off -compose multiply -composite \
-evaluate pow 0.5 -evaluate multiply $T \) \
\( -clone 0 -evaluate add "%[fx:v.maxima]" -evaluate divide "%[fx:2*v.maxima]" \
-evaluate multiply $T \) -delete 0,1 output2.png

I get a different result:

Am I doing something wrong. I suspect the first is correct, but am not sure. It looks like there is clamping somewhere in the latter two results. Or is there a bug here.

Given our limited time availability, we need you to reduce the complexity of your command-line to localize any bug before we can offer a solution. Introduce -write into your command-line to debug and discover under what circumstances your command-lines diverge. Once you have a minimal command-line that shows a divergence of results, post it here and we will investigate further.

OK. All the images until the last seem to be the same. The issue seems to be when creating the % escape inside a parenthesis for one image and trying to use it for another image.

Nevertheless, I found a better method that works using -set option as follows:

Code: Select all

T="65000"
sigma=5
im7 magick \
\( logo: -write mpr:imgI +delete \) \
\( mpr:imgI -blur 0x$sigma -write mpr:imgG +delete \) \
\( mpr:imgI mpr:imgG +swap -define compose:clamp=off -compose minus -composite \
mpr:imgG +swap -define compose:clamp=off -compose divide -composite -write mpr:imgD +delete \) \
\( mpr:imgD mpr:imgD -define compose:clamp=off -compose multiply -composite \
-evaluate pow 0.5 -evaluate multiply $T -write mpr:imgT +delete \) \
mpr:imgT -set option:mm "%[fx:maxima]" \
-set option:nn "%[fx:2*maxima]" +delete \
mpr:imgD -evaluate add "%[mm]" -evaluate divide "%[nn]" \
-evaluate multiply $T output3.png

Legacy ImageMagick Discussions Archive

[RESOLVED] Possible bug using mpc vs either clones or mpr

[RESOLVED] Possible bug using mpc vs either clones or mpr

Re: Possible bug using mpc vs either clones or mpr

Re: Possible bug using mpc vs either clones or mpr