Transform white background to transparency

[imagetester]

Hi i need to use the function MeanErrorPerPixel() in the magick++ library.
But it is giving a wrong comparison due to the white background.
I thought i could have a more precise result if i remove the white background of my logos.
Is their any way to do it with this library, i can't process this talk for each image because there are thousands of images.

I think their is a way by transforming the image to .png.

Any solution? thanks in advance

[yyyy273]

convert input.bmp bgnd.png -compose ChangeMask -composite output.png

bgnd.png is a solid white picture.

[imagetester]

Thanks man that really helped !

[imagetester]

But is there any way to write it in c++ using Magick++?!

[el_supremo]

See transparentImage in http://www.imagemagick.org/Magick++/STL.html
Just below that section is example code which shows how to change red to transparent in a GIF animation.

Pete

[imagetester]

Thanks again, ImageMagick is really powerful