CODEWITHSUNDEEP
c++opencv
Boidil
Boidil

Reputation: 217

I need white color like transparent color

I have a problem. I have this program that makes the black color transparent.

src=imread("0.jpg", 1);
cvtColor(src,tmp,CV_BGR2GRAY);  
threshold(tmp,alpha,100,255,THRESH_BINARY);         
Mat rgb[3];     
split(src,rgb);

Mat rgba[4]={rgb[0],rgb[1],rgb[2],alpha};   
merge(rgba,4,dst);          
imwrite("1.png",dst);

And his input and output is:

  1. https://i.sstatic.net/NPkXg.jpg - input
  2. Transparent background with white places - output

But I don't want black color transparent, I want that white is transparent. But I can not figure it out. Could you help me please? Thank you.

Upvotes: 1

Views: 281

Answers (1)

Boidil
Boidil

Reputation: 217

src=imread("0.jpg", 1);
cvtColor(src,tmp,CV_BGR2GRAY);  
threshold(tmp,alpha,100,255,THRESH_BINARY_INV);        
Mat rgb[3];     
split(src,rgb);

Mat rgba[4]={rgb[0],rgb[1],rgb[2],alpha};   
merge(rgba,4,dst);          
imwrite("1.png",dst);

If we choose THRESH_BINARY_INV instead of THRESH_BINARY. Output is: Black background with some transparent places. This was the whole problem and now is solved.

Upvotes: 2

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