diff --git a/Lib/contrast.c b/Lib/contrast.c
index 5634ce9..9154304 100644
--- a/Lib/contrast.c
+++ b/Lib/contrast.c
@@ -10,48 +10,53 @@
 /*::------------------------------------------------------------------::*/
 /*
  *	new: Fri Sep 15 20:18:35 UTC 2023
- *	inspired by the sam func in FloatImg
+ *	inspired by the same func in FloatImg
  */
 int Image_egalise_cos01(Image_Desc *source, Image_Desc *but, int k)
 {
-int		lut[256], uc;
-int		idx, foo;
-/* int		x, y, pix; */
+int		lut[256], uc, idx, foo;
 float		fidx;
 
+#if DEBUG_LEVEL
 fprintf(stderr, ">>> %s ( %p  %p  %d )\n", __func__,
 		source, but, k);
+#endif
 
 if ( (foo=Image_compare_desc(source, but)) ) {
 	fprintf(stderr, "%s: images not compatible, %d\n", __func__, foo);
 	return foo;
 	}
-
 for (idx=0; idx<256; idx++) {
 	fidx = (float)idx / 255.0;
 	uc = (unsigned char)(255.0*(0.5 - 0.5 * cos(3.141592654*fidx)));
 	lut[idx] = uc;
 	/* printf("%7d    %7d\n", idx, uc); */
 	}
+Image_LUT_mono(source, but, lut);
 
-/*
- *   old original code, replaced...
- *
-for (y=0; y<source->height; y++) {
-	for (x=0; x<source->width; x++) {
+return FUNC_IS_BETA;
+}
+/*::------------------------------------------------------------------::*/
+int Image_egalise_cos010(Image_Desc *source, Image_Desc *but, int k)
+{
+int		lut[256], uc, idx, foo;
+float		fidx;
 
-		pix = source->Rpix[y][x];
-		but->Rpix[y][x] = lut[pix];
-		pix = source->Gpix[y][x];
-		but->Gpix[y][x] = lut[pix];
-		pix = source->Bpix[y][x];
-		but->Bpix[y][x] = lut[pix];
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p  %p  %d )\n", __func__,
+		source, but, k);
+#endif
 
-		}
+if ( (foo=Image_compare_desc(source, but)) ) {
+	fprintf(stderr, "%s: images not compatible, %d\n", __func__, foo);
+	return foo;
+	}
+for (idx=0; idx<256; idx++) {
+	fidx = (float)idx / 255.0;
+	uc = (unsigned char)(255.0*(0.5 - 0.5 * cos(3.141592654*fidx*2.0)));
+	lut[idx] = uc;
+	/* printf("%7d    %7d\n", idx, uc); */
 	}
- *
- *	... by a func from 'calculs.c'
- */
 Image_LUT_mono(source, but, lut);
 
 return FUNC_IS_BETA;
diff --git a/Tools/tga_equalize.c b/Tools/tga_equalize.c
index 7ac09b3..8baba51 100644
--- a/Tools/tga_equalize.c
+++ b/Tools/tga_equalize.c
@@ -15,6 +15,7 @@
 #define		EQ_STD		4
 #define		EQ_GRAY		8
 #define		EQ_COS01	9
+#define		EQ_COS010	10
 #define		EQ_2X2		12
 #define		EQ_LUMIN	14
 #define		EQ_SQUARE	16
@@ -28,6 +29,7 @@ mot_clef mots_clef[] =
 { "rgb",	EQ_STD,		"", 	"same as 'std'"		},
 { "gray",	EQ_GRAY,	"",	"gray based"		},
 { "cos01",	EQ_COS01,	"",	"cosinus 0->1"		},
+{ "cos010",	EQ_COS010,	"",	"cosinus 0-1-0"		},
 { "2x2",	EQ_2X2,		"",	"2x2 matrix"		},
 { "lumin",	EQ_LUMIN,	"i",	"param: ident is 256"	},
 /* { "gamma",	EQ_GAMMA,	"d",	"not implemented"	},*/
@@ -40,7 +42,7 @@ mot_clef mots_clef[] =
 /*::------------------------------------------------------------------::*/
 void usage()
 {
-fprintf(stderr, "* tga_equalize v 0.0.23 [%s]  (dwtfywl) tonton Th\n",
+fprintf(stderr, "* tga_equalize v 0.0.24 [%s]  (dwtfywl) tonton Th\n",
 					TGA_OUTILS_VERSION);
 fprintf(stderr, "  compiled %s at %s\n", __DATE__, __TIME__);
 fprintf(stderr, "usage:\n\ttga_equalize avant.tga mode apres.tga [params]\n");
@@ -112,6 +114,10 @@ switch (commande)
 		foo = Image_egalise_cos01(src, dst, 0);
 		break;
 
+	case EQ_COS010:
+		foo = Image_egalise_cos010(src, dst, 0);
+		break;
+
 	case EQ_GAMMA:
 		fprintf(stderr, "no gamma func in %d\n", getpid());
 		foo = FULL_NUCKED;
diff --git a/tthimage.h b/tthimage.h
index 3bd716b..344615a 100644
--- a/tthimage.h
+++ b/tthimage.h
@@ -4,7 +4,7 @@
 	http://la.buvette.org/devel/libimage/
 */
 #ifndef IMAGE_VERSION_STRING
-	#define IMAGE_VERSION_STRING "0.4.51 pl 82"
+	#define IMAGE_VERSION_STRING "0.4.51 pl 85"
 
 /*::------------------------------------------------------------------::*/
 /*
@@ -98,7 +98,7 @@ typedef struct  {
         } Image_Rect;
 
 /*
- * new 11 Jan 2003: a struc like an Image_Rect, but with 
+ * new 11 Jan 2003: a struct like an Image_Rect, but with 
  *	double precision floating point coords.
  */
 typedef struct  {
@@ -121,7 +121,7 @@ typedef struct	{
  *	memory descriptor for bits-planes 
  *	27 Dec 2001: c,a devient quoi, cette histoire de bitmaps ?
  *	17 mars 2010: du code commence a venir...
- *
+ *	12 février 2024, on a toujours rien vu.
  */
 typedef struct	{
 	unsigned int	magic;
@@ -1205,7 +1205,8 @@ int	Image_insert_with_alpha(Image_Desc *img, Image_Desc *ins, int foo);
 int Image_pix_square(Image_Desc *source, Image_Desc *but, int k);
 int Image_pix_sqroot(Image_Desc *source, Image_Desc *but, int k);
 
-int Image_egalise_cos01(Image_Desc *source, Image_Desc *but, int k);
+int Image_egalise_cos01  (Image_Desc *source, Image_Desc *but, int k);
+int Image_egalise_cos010 (Image_Desc *source, Image_Desc *but, int k);
 
 /*::------------------------------------------------------------------::*/
 /*
@@ -1319,7 +1320,6 @@ int Image_shift_y(Image_Desc *src, Image_Desc *dst, int oy);
 int Image_center_rotate_xy(Image_Desc *src, Image_Desc *dst, double angle,
 						double x, double y);
 
-/*::------------------------------------------------------------------::*/
 /*::------------------------------------------------------------------::*/
 /*	anamorphose.c							*/