Legacy ImageMagick Discussions Archive

IM command:
convert test.png -alpha off \
-alpha set -fuzz 10% -fill none \
-draw "alpha 0,0 floodfill" \
-fill "rgba(255,255,255,1)" +opaque none \
-fill "rgba(0,0,0,1)" -opaque none \
-alpha off testDst.png



My question:
I'm a novice. How can I use IM C API on the above command, thanks.

Which C API?

There are two, MagickCore and MagickWand. We recommend MagickWand.

thanks，What I mean is how to use an api to implement the function of a command and what functions to use. I tried but did not succeed, give some suggestions。

You have to specify which C API you want to use; otherwise, no one can tell you the appropriate commands for that API. Also please identify your IM version and platform.

See the top-most post in this forum "IMPORTANT: Please Read This FIRST Before Posting" at http://www.imagemagick.org/discourse-se ... f=1&t=9620

System:
linux IM: ImageMagick-7 API: magicwand by c

code:
PixelWand *fillColor = NewPixelWand();
PixelSetColor(fillColor, "rgba(0,0,0,1)");
PixelSetFuzz(fillColor, img.fuzzval);

DrawSetFillColor(drawImage, fillColor);
DrawAlpha(drawImage, 0, 0, FloodfillMethod);

MagickDrawImage(image, drawImage);
I want to get a mask of the image, the above code is applied to the image, get the largest border outside the black, how to reverse the transfer of the rest of the white