How to change every black pixel to a special color?

Question

I want to extract all video frames as images and change every black (pure black) pixel of the images to a special color. (R=3,G=3,B=3)

I used this command to extract video frames :

ffmpeg -I myVideo.avi -f image2 -vf yadif -vcodec png image%d

Please tell me how to change every black pixel of the images to color that I want? (I want R=3,G=3,B=3)

Thanks.

Answer 1

You can use the LUT or GEQ filters for this.

e.g. with LUT

ffmpeg -i myVideo.avi
       -vf
       "yadif,format=rgb24,
        lutrgb=r='if(eq(val,0),3,val)':g='if(eq(val,0),3,val)':b='if(eq(val,0),3,val)'"
image%d.png