diff --git a/funcs/Makefile b/funcs/Makefile
index 765f181a..4ae67470 100644
--- a/funcs/Makefile
+++ b/funcs/Makefile
@@ -1,9 +1,9 @@
 #---------------------------------------------------------------
 
-COPT = -Wall -fpic -g -no-pie -DDEBUG_LEVEL=0
+COPT = -Wall -fpic -g -no-pie -DDEBUG_LEVEL=1
 DEPS = ../floatimg.h Makefile
 OBJS = fimg-png.o fimg-tiff.o misc-plots.o filtrage.o utils.o	\
-	fimg-libpnm.o
+	fimg-libpnm.o rampes.o
 
 #---------------------------------------------------------------
 
@@ -30,5 +30,8 @@ misc-plots.o:		misc-plots.c $(DEPS)
 filtrage.o:		filtrage.c $(DEPS)
 	gcc $(COPT) -c $<
 
+rampes.o:		rampes.c $(DEPS)
+	gcc $(COPT) -c $<
+
 utils.o:		utils.c $(DEPS)
 	gcc $(COPT) -c $<
diff --git a/funcs/rampes.c b/funcs/rampes.c
new file mode 100644
index 00000000..1680b0d5
--- /dev/null
+++ b/funcs/rampes.c
@@ -0,0 +1,62 @@
+/*
+ *		FLOATIMG
+ *	rampes diverses, trucs etranges 
+ */
+
+#include  <stdio.h>
+
+#include  "../floatimg.h"
+
+/* --------------------------------------------------------------------- */
+int fimg_hdeg_a(FloatImg *img, double dcoef)
+{
+int		x, y;
+float		value;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p %f )\n", __func__, img, dcoef);
+#endif
+
+if (FIMG_TYPE_RGB != img->type) {
+	fprintf(stderr, "%s bad type\n", __func__);
+	return -6;
+	}
+
+for (x=0; x<img->width; x++)
+	{
+	value = (float)x / (float)img->width;
+	value *= dcoef;
+	for (y=0; y<img->height; y++) {
+		fimg_plot_rgb(img, x, y, value, value, value);
+		}
+	}
+
+return 0;
+}
+/* --------------------------------------------------------------------- */
+int fimg_vdeg_a(FloatImg *img, double dcoef)
+{
+int		x, y;
+float		value;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p %f )\n", __func__, img, dcoef);
+#endif
+
+if (FIMG_TYPE_RGB != img->type) {
+	fprintf(stderr, "%s bad type\n", __func__);
+	return -6;
+	}
+
+for (y=0; y<img->height; y++)
+	{
+	value = (float)y / (float)img->height;
+	value *= dcoef;
+	for (x=0; x<img->width; x++) {
+		fimg_plot_rgb(img, x, y, value, value, value);
+		}
+	}
+
+return 0;
+}
+/* --------------------------------------------------------------------- */
diff --git a/funcs/t.c b/funcs/t.c
index 019b7bb4..dbd0e54d 100644
--- a/funcs/t.c
+++ b/funcs/t.c
@@ -48,6 +48,26 @@ printf("%-10s %d\n\n", fname, foo);
 foo = format_from_extension(fname="foo.xyzzy");
 printf("%-10s %d\n\n", fname, foo);
 
+return 0;
+}
+/* --------------------------------------------------------------------- */
+int essai_rampes(void)
+{
+FloatImg	fimg;
+int		foo;
+
+fimg_create(&fimg, 640, 480, FIMG_TYPE_RGB);
+
+foo = fimg_hdeg_a(&fimg, (double)3.141592654);
+fprintf(stderr, "make h deg -> %d\n", foo);
+foo = fimg_save_as_pnm(&fimg, "hdeg.pnm", 0);
+fprintf(stderr, "%s: save as pnm -> %d\n", __func__, foo);
+
+foo = fimg_vdeg_a(&fimg, (double)3.141592654);
+fprintf(stderr, "make h deg -> %d\n", foo);
+foo = fimg_save_as_pnm(&fimg, "vdeg.pnm", 0);
+fprintf(stderr, "%s: save as pnm -> %d\n", __func__, foo);
+
 return 0;
 }
 /* --------------------------------------------------------------------- */
@@ -81,7 +101,7 @@ int		foo;
 
 puts("++++++++++++++++++++++++++++++++");
 
-foo = essai_ecrire_png("dessin.png");
+foo = essai_rampes();
 
 return 0;
 }