Switch default gamma input curve to Rec. 709.

diff --git a/theme.cpp b/theme.cpp
index 5573c5562c0abce6cb651cfa1fb56690fa86f760..1536503adcece94f4ba20b7e2d626eb1604b86c0 100644 (file)
--- a/theme.cpp
+++ b/theme.cpp
@@ -128,7 +128,15 @@ int EffectChain_finalize(lua_State* L)
        // what's put in the H.264 stream (sps_rbsp()).
        ImageFormat inout_format;
        inout_format.color_space = COLORSPACE_REC_709;
-       inout_format.gamma_curve = GAMMA_REC_709;
+
+       // Gamma curve depends on the input signal, and we don't really get any
+       // indications. A camera would be expected to do Rec. 709, but
+       // I haven't checked if any do in practice. However, computers _do_ output
+       // in sRGB gamma (ie., they don't convert from sRGB to Rec. 709), and
+       // I wouldn't really be surprised if most non-professional cameras do, too.
+       // So we pick sRGB as the least evil here.
+       inout_format.gamma_curve = GAMMA_sRGB;
+
        if (is_main_chain) {
                YCbCrFormat output_ycbcr_format;
                // We actually output 4:2:0 in the end, but chroma subsampling