Back to RGBx format, 3 bands in 4 bytes. Tests for internal consistency

Tests/test_image_lab.py

@@ -0,0 +1,25 @@
+from tester import *
+
+from PIL import Image
+
+def test_sanity():
+    i = Image.open('Tests/images/lab.tif')
+
+    bits = i.load()
+    
+    assert_equal(i.mode, 'LAB')
+
+    assert_equal(i.getbands(), ('L','A', 'B'))
+
+    k = i.getpixel((0,0))
+    assert_equal(k, (255,0,0))
+
+    L  = i.getdata(0)
+    a = i.getdata(1)
+    b = i.getdata(2)
+
+    assert_equal(list(L), [255]*100)
+    assert_equal(list(a), [0]*100)
+    assert_equal(list(b), [0]*100)
+    
+

libImaging/Pack.c

@@ -527,7 +527,7 @@ static struct {
     {"YCbCr",  	"Cr",           8,      band2},
 
     /* LAB Color */
-    {"LAB",	    "LAB",	       24,     copy3},
+    {"LAB",	    "LAB",	       24,     ImagingPackRGB},
     {"LAB",  	"L",           8,      band0},
     {"LAB",  	"A",           8,      band1},
     {"LAB",  	"B",           8,      band2},

libImaging/Storage.c

@@ -182,9 +182,8 @@ ImagingNewPrologueSubtype(const char *mode, unsigned xsize, unsigned ysize,
         /* 24-bit color, luminance, + 2 color channels */
         /* L is uint8, a,b are int8 */
         im->bands = 3;
-        im->pixelsize = 3;
+        im->pixelsize = 4;
-        im->linesize = (xsize*4 + 3) & -4;
+        im->linesize = xsize * 4;
-        im->type = IMAGING_TYPE_SPECIAL;
 
     } else {
         free(im);

libImaging/Unpack.c

@@ -965,7 +965,7 @@ static struct {
     {"YCbCr",   "YCbCrK",       32,     copy4},
 
     /* LAB Color */
-    {"LAB",	    "LAB",	        24,	    copy3},
+    {"LAB",	    "LAB",	        24,	    ImagingUnpackRGB},
     {"LAB",  	"L",            8,      band0},
     {"LAB",  	"A",            8,      band1},
     {"LAB",  	"B",            8,      band2},