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Add most dominant colour to image stats #640

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Lovell Fuller
2020-07-15 19:58:54 +01:00
parent dcc42f8514
commit c42de19d2a
10 changed files with 130 additions and 36 deletions
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17
src/stats.cc
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@@ -86,6 +86,18 @@ class StatsWorker : public Napi::AsyncWorker {
0.0, 1.0, 0.0);
laplacian.set("scale", 9.0);
baton->sharpness = greyscale.conv(laplacian).deviate();
// Most dominant sRGB colour via 4096-bin 3D histogram
vips::VImage hist = sharp::RemoveAlpha(image)
.colourspace(VIPS_INTERPRETATION_sRGB)
.hist_find_ndim(VImage::option()->set("bins", 16));
std::complex<double> maxpos = hist.maxpos();
int const dx = static_cast<int>(std::real(maxpos));
int const dy = static_cast<int>(std::imag(maxpos));
std::vector<double> pel = hist(dx, dy);
int const dz = std::distance(pel.begin(), std::find(pel.begin(), pel.end(), hist.max()));
baton->dominantRed = dx * 16 + 8;
baton->dominantGreen = dy * 16 + 8;
baton->dominantBlue = dz * 16 + 8;
} catch (vips::VError const &err) {
(baton->err).append(err.what());
}
@@ -133,6 +145,11 @@ class StatsWorker : public Napi::AsyncWorker {
info.Set("isOpaque", baton->isOpaque);
info.Set("entropy", baton->entropy);
info.Set("sharpness", baton->sharpness);
Napi::Object dominant = Napi::Object::New(env);
dominant.Set("r", baton->dominantRed);
dominant.Set("g", baton->dominantGreen);
dominant.Set("b", baton->dominantBlue);
info.Set("dominant", dominant);
Callback().MakeCallback(Receiver().Value(), { env.Null(), info });
} else {
Callback().MakeCallback(Receiver().Value(), { Napi::Error::New(env, baton->err).Value() });