How to set "distort:viewport=WxH" for the distort function in magick++?

[lq634254672]

I have found distort function has only 4 parameters in magick++, such as Image.distort(PerspectiveDistortion,16,point_4,false). Now i want to define "distort:viewport=WxH" to get a specified output. What do i do?

[snibgo]

See http://www.imagemagick.org/discourse-se ... 29#p157520

[lq634254672]

See http://www.imagemagick.org/discourse-se ... 29#p157520

Thanks very much, and now, i have another problem: i use the following codes to get a specified output with transparent background. But the background is not transparent overall, it has a corner with gray color. Is there something wrong of the code?

Code: Select all

Image image( filename );
image.artifact("distort:viewport","540x960");
image.virtualPixelMethod(Magick::TransparentVirtualPixelMethod);
image.distort(PerspectiveDistortion,16,point_4,false);
image.write("distort.png");

[lq634254672]

See http://www.imagemagick.org/discourse-se ... 29#p157520

Thanks very much, and now, i have another problem: i use the following codes to get a specified output with transparent background. But the background is not transparent overall, it has a corner with gray color. Is there something wrong of the code?

Code: Select all

Image image( filename );
image.artifact("distort:viewport","540x960");
image.virtualPixelMethod(Magick::TransparentVirtualPixelMethod);
image.distort(PerspectiveDistortion,16,point_4,false);
image.write("distort.png");

Thanks very much. I have found the problem. I corrected my code as follows, it is work for me.

Code: Select all

image.artifact("distort:viewport","540x960");
image.matteColor(Color("transparent") );
image.virtualPixelMethod(Magick::TransparentVirtualPixelMethod);
image.distort(PerspectiveDistortion,16,point_4,false);
image.write("distort.png");