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How to subtract a constant from a 3 channel mat ?

asked 2017-01-11 04:24:36 -0500

Nbb gravatar image

updated 2017-01-11 04:25:14 -0500

I have a Mat CV_8UC3. I want to let the new value be

Mat = 255 - Mat;

but the results are blue. How do let every element be 255 - element ?

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answered 2017-01-11 05:26:58 -0500

berak gravatar image

updated 2017-01-11 08:04:52 -0500

you need a 3-channel value to subtract from, else it does something like 0 - value, which gets saturated to 0, so:

1.

mat = Scalar(255,255,255) - mat;

2.

subtract(Scalar(255,255,255), mat, mat);
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Asked: 2017-01-11 04:24:36 -0500

Seen: 91 times

Last updated: Jan 11