What does the "-compare" option do?

[XnTriq]

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-compare filename method : Compare with this image, method (red, red_only)

[xnview]

output pixels difference between 2 images (need to be same size)

[XnTriq]

output pixels difference between 2 images (need to be same size)

I was hoping for something like this to be implemented, but I can't get it to work.

How do I tell nConvert to compare (the blue channels of) two images (original.png + edited.png)?

Code: Select all

nconvert.exe -compare edited.png original.png

Could you please give me an example illustrating the purpose of the method argument and what values (red/green/bue? red_only/green_only/blue_only/alpha_only?) are accepted as parameters?

[xnview]

you can try

Code: Select all

nconvert.exe -compare edited.png red original.png

only red/red_only as parameters

[XnTriq]

you can try

Code: Select all

nconvert.exe -compare edited.png red original.png

only red/red_only as parameters

Thanks, Pierre!

www.cambridgeincolour.com/tutorials/bit-depth.htm

test.png (72.62 KiB) Viewed 3007 times

nconvert.exe -out jpeg -q 100 -opthuff -dct 2 -smoothingf 0 -subsampling 2 -o test.jpg test.png

test.jpg (94.87 KiB) Viewed 3007 times

nconvert.exe -compare test.jpg red test.png

nconvert_red.png (91.46 KiB) Viewed 3007 times

nconvert.exe -compare test.jpg red_only test.png

nconvert_redonly.png (41.61 KiB) Viewed 3007 times

www.softpedia.com/get/Multimedia/Graphic/Graphic-Others/ImageDiff.shtml

imagediff.png (18.93 KiB) Viewed 3007 times