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Implements greyscale thresholding

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This commit is contained in:
David Carley
2015-11-17 12:15:34 -06:00
parent 5dfeaa9fd1
commit 3af62446fc
14 changed files with 189 additions and 4 deletions
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17
src/operations.cc
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@@ -262,4 +262,21 @@ namespace sharp {
*out = sharpened;
return 0;
}
int Threshold(VipsObject *context, VipsImage *image, VipsImage **out, int threshold) {
VipsImage *greyscale;
if (vips_colourspace(image, &greyscale, VIPS_INTERPRETATION_B_W, nullptr)) {
return -1;
}
vips_object_local(context, greyscale);
image = greyscale;
VipsImage *thresholded;
if (vips_moreeq_const1(image, &thresholded, threshold, nullptr)) {
return -1;
}
vips_object_local(context, thresholded);
*out = thresholded;
return 0;
}
} // namespace sharp