CODEWITHSUNDEEP
c++opencvtextscalar
black
black

Reputation: 1241

OpenCV 2.4 putText() and Scalar understanding

I'm using OpenCV 2.4.11 in C++. I want to display a text with the putText() function on my picture.
For example:

putText(imageOutput,"x:",Point(pos[0],pos[1]),1,1,Scalar(255,0,0),2);

What does the Scalar input do? Is there an alternative input instead of Scalar?

Upvotes: 3

Views: 1259

Answers (1)

GPPK
GPPK

Reputation: 6666

Your code:

putText(imageOutput,"x:",Point(pos[0],pos[1]),1,1,Scalar(255,0,0),2);

Your question:

What does the Scalar function do?

You are creating a Scalar object, you can see the documentation here

If you want to create a BGR (full colour) image then you can initialise the Scalar with Scalar(B,G,R). However if you only want a greyscale image all you need to do is initialise it with your greyscale value:

Scalar(greyScaleValue);

so your code would be:

putText(imageOutput,"x:",Point(pos[0],pos[1]),1,1,Scalar(30),2);

for a greyscale value of 30.

Upvotes: 2

Related Questions