CODEWITHSUNDEEP
opencvimage-processing
Adi Shavit
Adi Shavit

Reputation: 17285

Simple Way to Scale Channels in OpenCV

It seems that given a multi-channel image img I cannot do this:

img *= cv::Scalar(1.5,0.5,2.1);

I'd like to scale each channel by a different float factor.
Is there a simple way to do this?

I could use cv::transform() but that seems like overkill (I also obviously don't want to manually and explicitly iterate on all the pixels).

Any suggestions?

Upvotes: 2

Views: 2755

Answers (1)

Miki
Miki

Reputation: 41765

You can use multiply:

cv::Mat3b m = ... ;
cv::multiply(m, cv::Scalar(2, 3, 4), m);

or, as suggested by @AdiShavit:

cv::Mat3b m = ... ;
m = m.mul(cv::Scalar(2, 3, 4));

Upvotes: 6

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