diff --git a/pipi/pipi.h b/pipi/pipi.h
index 9a564d9..8e872d8 100644
--- a/pipi/pipi.h
+++ b/pipi/pipi.h
@@ -34,8 +34,9 @@ extern void pipi_save(pipi_image_t *img, const char *name);
 
 extern int pipi_getgray(pipi_image_t const *img, int x, int y, int *g);
 extern int pipi_getpixel(pipi_image_t const *img,
-                         int x, int y, int *r, int *g, int *b);
-extern int pipi_setpixel(pipi_image_t *img, int x, int y, int r, int g, int b);
+                         int x, int y, double *r, double *g, double *b);
+extern int pipi_setpixel(pipi_image_t *img, int x, int y,
+                         double r, double g, double b);
 
 extern pipi_image_t *pipi_resize(pipi_image_t const *, int, int);
 
diff --git a/pipi/pixels.c b/pipi/pixels.c
index d1b0286..fed1662 100644
--- a/pipi/pixels.c
+++ b/pipi/pixels.c
@@ -25,11 +25,11 @@
 
 #include <math.h>
 
-#include "pipi_internals.h"
 #include "pipi.h"
+#include "pipi_internals.h"
 
-#define C2I(p) ((int)255.999*pow(((double)p)/255., 2.2))
-#define I2C(p) ((int)255.999*pow(((double)p)/255., 1./2.2))
+#define C2I(p) (pow(((double)p)/255., 2.2))
+#define I2C(p) ((int)255.999*pow(((double)p), 1./2.2))
 
 int pipi_getgray(pipi_image_t const *img, int x, int y, int *g)
 {
@@ -45,15 +45,13 @@ int pipi_getgray(pipi_image_t const *img, int x, int y, int *g)
 }
 
 int pipi_getpixel(pipi_image_t const *img,
-                  int x, int y, int *r, int *g, int *b)
+                  int x, int y, double *r, double *g, double *b)
 {
     uint8_t *pixel;
 
     if(x < 0 || y < 0 || x >= img->width || y >= img->height)
     {
-        *r = 255;
-        *g = 255;
-        *b = 255;
+        *r = *g = *b = 1.;
         return -1;
     }
 
@@ -66,7 +64,7 @@ int pipi_getpixel(pipi_image_t const *img,
     return 0;
 }
 
-int pipi_setpixel(pipi_image_t *img, int x, int y, int r, int g, int b)
+int pipi_setpixel(pipi_image_t *img, int x, int y, double r, double g, double b)
 {
     uint8_t *pixel;
 
diff --git a/pipi/resize.c b/pipi/resize.c
index afbd5a8..2cc1ea4 100644
--- a/pipi/resize.c
+++ b/pipi/resize.c
@@ -22,12 +22,12 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "pipi_internals.h"
 #include "pipi.h"
+#include "pipi_internals.h"
 
 pipi_image_t *pipi_resize(pipi_image_t const *src, int w, int h)
 {
-    int *aline, *line;
+    double *aline, *line;
     pipi_image_t *dst;
     int x, y, x0, y0, sw, dw, sh, dh, remy;
 
@@ -36,28 +36,28 @@ pipi_image_t *pipi_resize(pipi_image_t const *src, int w, int h)
     sw = src->width; sh = src->height;
     dw = dst->width; dh = dst->height;
 
-    aline = malloc(3 * dw * sizeof(int));
-    line = malloc(3 * dw * sizeof(int));
+    aline = malloc(3 * dw * sizeof(double));
+    line = malloc(3 * dw * sizeof(double));
 
-    memset(line, 0, 3 * dw * sizeof(int));
+    memset(line, 0, 3 * dw * sizeof(double));
     remy = 0;
 
     for(y = 0, y0 = 0; y < dst->height; y++)
     {
         int toty = 0, ny;
 
-        memset(aline, 0, 3 * dw * sizeof(int));
+        memset(aline, 0, 3 * dw * sizeof(double));
 
         while(toty < sh)
         {
             if(remy == 0)
             {
-                int r = 0, g = 0, b = 0;
+                double r = 0, g = 0, b = 0;
                 int remx = 0;
 
                 for(x = 0, x0 = 0; x < dst->width; x++)
                 {
-                    int ar = 0, ag = 0, ab = 0;
+                    double ar = 0, ag = 0, ab = 0;
                     int totx = 0, nx;
 
                     while(totx < sw)