emboss function
Apply an emboss convolution filter.
Implementation
Image emboss(Image src,
{num amount = 1, Image? mask, Channel maskChannel = Channel.luminance}) {
const filter = [1.5, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -1.5];
return convolution(src,
filter: filter,
div: 1,
offset: 127,
amount: amount,
mask: mask,
maskChannel: maskChannel);
}