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chromahold: Fix hue calculation for red colors

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Also make the calculation much more accurate...
This commit is contained in:
Sebastian Dröge 2010-10-06 16:54:16 +02:00
parent 10e0187df1
commit 59720fd42a
1 changed files with 9 additions and 8 deletions
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17
gst/coloreffects/gstchromahold.c
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@ -52,7 +52,7 @@ GST_DEBUG_CATEGORY_STATIC (gst_chroma_hold_debug);
#define DEFAULT_TARGET_R 255
#define DEFAULT_TARGET_G 0
#define DEFAULT_TARGET_B 0
#define DEFAULT_TOLERANCE 2
#define DEFAULT_TOLERANCE 30
enum
{
@ -301,23 +301,24 @@ gst_chroma_hold_set_caps (GstBaseTransform * btrans,
static inline gint
rgb_to_hue (gint r, gint g, gint b)
{
gint m, M, C, h;
gint m, M, C, C2, h;
m = MIN (MIN (r, g), b);
M = MAX (MAX (r, g), b);
C = M - m;
C2 = C >> 1;
if (C == 0) {
return G_MAXUINT;
} else if (M == r) {
h = ((g - b) / C) % 6;
h = ((256 * 60 * (g - b) + C2) / C);
} else if (M == g) {
h = ((b - r) / C) + 2;
} else { /* if (M == b) */
h = ((r - g) / C) + 4;
h = ((256 * 60 * (b - r) + C2) / C) + 120 * 256;
} else {
/* if (M == b) */
h = ((256 * 60 * (r - g) + C2) / C) + 240 * 256;
}
h = 60 * h;
h >>= 8;
if (h >= 360)
h -= 360;