diff = sqrt((du * du + dv * dv) / (255.0 * 255.0));
alpha = diff > ctx->similarity;
- if (alpha) {
+ if (ctx->blend > 0.0001) {
+ double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);
+
+ frame->data[1][frame->linesize[1] * y + x] = 128 + (u - 128) * f;
+ frame->data[2][frame->linesize[2] * y + x] = 128 + (v - 128) * f;
+ } else if (alpha) {
frame->data[1][frame->linesize[1] * y + x] = 128;
frame->data[2][frame->linesize[2] * y + x] = 128;
}
static const AVOption chromahold_options[] = {
{ "color", "set the chromahold key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "similarity", "set the chromahold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
+ { "blend", "set the chromahold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
{ "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ NULL }
};