diff --git a/ChangeLog b/ChangeLog
index 756d4cfc..4292cb35 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+started 8.6.0 16/8/17
+- add scRGB support
+- improve radiance support
+
 started 8.5.1 22/1/17
 - fix a crash bug
 - make separate Image / Alpha menu, add Add, Extract, Drop
diff --git a/configure.ac b/configure.ac
index 2ee7a406..cfe129ee 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 # Process this file with autoconf to produce a configure script.
 
-AC_INIT([nip2], [8.5.1], [vipsip@jiscmail.ac.uk])
+AC_INIT([nip2], [8.6.0], [vipsip@jiscmail.ac.uk])
 
 # foreign stops complaints about a missing README (we use README.md instead)
 # and missing INSTALL (the standard Gnu INSTALL is not very useful)
@@ -16,8 +16,8 @@ dnl of them.
 dnl
 
 m4_define([nip_major_version], [8])
-m4_define([nip_minor_version], [5])
-m4_define([nip_micro_version], [1])
+m4_define([nip_minor_version], [6])
+m4_define([nip_micro_version], [0])
 m4_define([nip_version],
           [nip_major_version.nip_minor_version.nip_micro_version])
 
diff --git a/share/nip2/start/Colour.def b/share/nip2/start/Colour.def
index bb2b7906..6d042103 100644
--- a/share/nip2/start/Colour.def
+++ b/share/nip2/start/Colour.def
@@ -83,6 +83,11 @@ Colour_convert_item = class
 		action x = conv Image_type.sRGB x;
 	}
 
+	scRGB_item = class
+		Menuaction (_ "_scRGB") (_ "convert to scRGB colourspace") {
+		action x = conv Image_type.scRGB x;
+	}
+
 	GREY16_item = class
 		Menuaction (_ "_GREY16") (_ "convert to GREY16 colourspace") {
 		action x = conv Image_type.GREY16 x;
@@ -155,6 +160,11 @@ Colour_tag_item = class
 		action x = tag Image_type.sRGB x;
 	}
 
+	scRGB_item = class
+		Menuaction (_ "_scRGB") (_ "tag as being in scRGB colourspace") {
+		action x = tag Image_type.scRGB x;
+	}
+
 	RGB16_item = class
 		Menuaction (_ "_RGB16") (_ "tag as being in RGB16 colourspace") {
 		action x = tag Image_type.RGB16 x;
diff --git a/share/nip2/start/_convert.def b/share/nip2/start/_convert.def
index c8002860..c63f78ae 100644
--- a/share/nip2/start/_convert.def
+++ b/share/nip2/start/_convert.def
@@ -373,6 +373,33 @@ im_RGB162GREY16 in
 im_GREY162RGB16 in 
 	= image_set_type Image_type.RGB16 (in ++ in ++ in);
 
+/* The vips8 scRGB functions.
+ */
+
+im_sRGB2scRGB in
+	= out
+{
+	[out] = vips_call "sRGB2scRGB" [in] [];
+}
+
+im_scRGB2sRGB in
+	= out
+{
+	[out] = vips_call "scRGB2sRGB" [in] [];
+}
+
+im_scRGB2XYZ in
+	= out
+{
+	[out] = vips_call "scRGB2XYZ" [in] [];
+}
+
+im_XYZ2scRGB in
+	= out
+{
+	[out] = vips_call "XYZ2scRGB" [in] [];
+}
+
 /* apply a func to an image ... make it 1 or 3 bands, and reapply other bands
  * on the way out. Except if it's LABPACK.
  */
@@ -457,6 +484,7 @@ _colour_conversion_table = [
 	[B_W, UCS, im_XYZ2UCS @ im_sRGB2XYZ @ im_mono2sRGB @ im_clip],
 	[B_W, RGB, im_XYZ2disp @ im_sRGB2XYZ @ im_mono2sRGB @ im_clip],
 	[B_W, sRGB, im_mono2sRGB @ im_clip],
+	[B_W, scRGB, im_sRGB2scRGB @ im_mono2sRGB @ im_clip],
 	[B_W, RGB16, image_set_type RGB16 @ im_8216 @ im_mono2sRGB],
 	[B_W, GREY16, image_set_type GREY16 @ im_8216],
 	[B_W, LABQ, im_Lab2LabQ @ im_sRGB2Lab @ im_mono2sRGB @ im_clip],
@@ -471,6 +499,7 @@ _colour_conversion_table = [
 	[XYZ, UCS, im_XYZ2UCS @ im_clip2f],
 	[XYZ, RGB, im_XYZ2disp @ im_clip2f],
 	[XYZ, sRGB, im_XYZ2sRGB @ im_clip2f],
+	[XYZ, scRGB, im_XYZ2scRGB @ im_clip2f],
 	[XYZ, LABQ, im_Lab2LabQ @ im_XYZ2Lab @ im_clip2f],
 	[XYZ, LABS, im_LabQ2LabS @ im_Lab2LabQ @ im_XYZ2Lab @ im_clip2f],
 
@@ -482,6 +511,7 @@ _colour_conversion_table = [
 	[YXY, UCS, im_XYZ2UCS @ im_Yxy2XYZ @ im_clip2f],
 	[YXY, RGB, im_XYZ2disp @ im_Yxy2XYZ @ im_clip2f],
 	[YXY, sRGB, im_XYZ2sRGB @ im_Yxy2XYZ @ im_clip2f],
+	[YXY, scRGB, im_XYZ2scRGB @ im_Yxy2XYZ @ im_clip2f],
 	[YXY, LABQ, im_Lab2LabQ @ im_XYZ2Lab @ im_Yxy2XYZ @ im_clip2f],
 	[YXY, LABS, im_LabQ2LabS @ im_Lab2LabQ @ im_XYZ2Lab @ im_Yxy2XYZ @
 		im_clip2f],
@@ -494,6 +524,7 @@ _colour_conversion_table = [
 	[LAB, UCS, im_Lab2UCS @ im_clip2f],
 	[LAB, RGB, im_Lab2disp @ im_clip2f],
 	[LAB, sRGB, im_Lab2sRGB @ im_clip2f],
+	[LAB, scRGB, im_XYZ2scRGB @ im_Lab2XYZ @ im_clip2f],
 	[LAB, LABQ, im_Lab2LabQ @ im_clip2f],
 	[LAB, LABS, im_Lab2LabS @ im_clip2f],
 
@@ -505,6 +536,7 @@ _colour_conversion_table = [
 	[LCH, UCS, im_LCh2UCS @ im_clip2f],
 	[LCH, RGB, im_Lab2disp @ im_LCh2Lab @ im_clip2f],
 	[LCH, sRGB, im_Lab2sRGB @ im_LCh2Lab @ im_clip2f],
+	[LCH, scRGB, im_XYZ2scRGB @ im_Lab2XYZ @ im_LCh2Lab @ im_clip2f],
 	[LCH, LABQ, im_Lab2LabQ @ im_LCh2Lab @ im_clip2f],
 	[LCH, LABS, im_LabQ2LabS @ im_Lab2LabQ @ im_LCh2Lab @ im_clip2f],
 
@@ -516,6 +548,7 @@ _colour_conversion_table = [
 	[UCS, UCS, image_set_type UCS],
 	[UCS, RGB, im_Lab2disp @ im_UCS2Lab @ im_clip2f],
 	[UCS, sRGB, im_Lab2sRGB @ im_UCS2Lab @ im_clip2f],
+	[UCS, scRGB, im_XYZ2scRGB @ im_Lab2XYZ @ im_UCS2Lab @ im_clip2f],
 	[UCS, LABQ, im_Lab2LabQ @ im_UCS2Lab @ im_clip2f],
 	[UCS, LABS, im_LabQ2LabS @ im_Lab2LabQ @ im_UCS2Lab @ im_clip2f],
 
@@ -527,6 +560,7 @@ _colour_conversion_table = [
 	[RGB, UCS, im_Lab2UCS @ im_disp2Lab @ im_clip],
 	[RGB, RGB, image_set_type RGB],
 	[RGB, sRGB, im_XYZ2sRGB @ im_disp2XYZ @ im_clip],
+	[RGB, scRGB, im_XYZ2scRGB @ im_disp2XYZ @ im_clip],
 	[RGB, RGB16, image_set_type RGB16 @ im_8216],
 	[RGB, GREY16, image_set_type GREY16 @ im_8216 @ im_sRGB2mono],
 	[RGB, LABQ, im_Lab2LabQ @ im_disp2Lab @ im_clip],
@@ -540,14 +574,31 @@ _colour_conversion_table = [
 	[sRGB, UCS, im_XYZ2UCS @ im_sRGB2XYZ @ im_clip],
 	[sRGB, RGB, im_XYZ2disp @ im_sRGB2XYZ @ im_clip],
 	[sRGB, sRGB, image_set_type sRGB],
+	[sRGB, scRGB, im_sRGB2scRGB @ im_clip],
 	[sRGB, RGB16, image_set_type RGB16 @ im_8216],
 	[sRGB, GREY16, image_set_type GREY16 @ im_8216 @ im_sRGB2mono],
 	[sRGB, LABQ, im_Lab2LabQ @ im_sRGB2Lab @ im_clip],
-	[sRGB, LABS, im_LabQ2LabS @ im_Lab2LabQ @ im_sRGB2Lab @ im_clip],
+	[sRGB, LABS, im_Lab2LabS @ im_sRGB2Lab @ im_clip],
+
+	[scRGB, B_W, im_sRGB2mono @ im_scRGB2sRGB],
+	[scRGB, XYZ, im_scRGB2XYZ],
+	[scRGB, YXY, im_XYZ2Yxy @ im_scRGB2XYZ],
+	[scRGB, LAB, im_XYZ2Lab @ im_scRGB2XYZ],
+	[scRGB, LCH, im_Lab2LCh @ im_XYZ2Lab @ im_scRGB2XYZ],
+	[scRGB, UCS, im_XYZ2UCS @ im_scRGB2XYZ],
+	[scRGB, RGB, im_XYZ2disp @ im_scRGB2XYZ],
+	[scRGB, sRGB, im_scRGB2sRGB],
+	[scRGB, scRGB, image_set_type scRGB],
+	[scRGB, RGB16, image_set_type RGB16 @ im_8216 @ im_scRGB2sRGB],
+	[scRGB, GREY16, image_set_type GREY16 @ im_8216 @ im_sRGB2mono @ 
+		im_scRGB2sRGB],
+	[scRGB, LABQ, im_Lab2LabQ @ im_XYZ2Lab @ im_scRGB2XYZ],
+	[scRGB, LABS, im_Lab2LabS @ im_XYZ2Lab @ im_scRGB2XYZ],
 
 	[RGB16, B_W, im_1628 @ im_sRGB2mono],
 	[RGB16, RGB, image_set_type RGB @ im_1628],
 	[RGB16, sRGB, image_set_type sRGB @ im_1628],
+	[RGB16, scRGB, im_sRGB2scRGB],
 	[RGB16, RGB16, image_set_type RGB16],
 	[RGB16, GREY16, im_RGB162GREY16],
 	[RGB16, LABS, im_LabQ2LabS @ im_Lab2LabQ @ im_sRGB2Lab],
@@ -555,6 +606,7 @@ _colour_conversion_table = [
 	[GREY16, B_W, image_set_type B_W @ im_1628],
 	[GREY16, RGB, im_mono2sRGB @ im_1628],
 	[GREY16, sRGB, im_mono2sRGB @ im_1628],
+	[GREY16, scRGB, im_sRGB2scRGB @ im_mono2sRGB],
 	[GREY16, RGB16, im_GREY162RGB16],
 	[GREY16, GREY16, image_set_type GREY16],
 
@@ -566,6 +618,7 @@ _colour_conversion_table = [
 	[LABQ, UCS, im_Lab2UCS @ im_LabQ2Lab],
 	[LABQ, RGB, im_LabQ2disp],
 	[LABQ, sRGB, im_Lab2sRGB @ im_LabQ2Lab],
+	[LABQ, scRGB, im_XYZ2scRGB @ im_Lab2XYZ @ im_LabQ2Lab],
 	[LABQ, LABQ, image_set_type LABQ],
 	[LABQ, LABS, im_LabQ2LabS],
 
@@ -578,8 +631,8 @@ _colour_conversion_table = [
 	[LABS, LCH, im_Lab2LCh @ im_LabQ2Lab @ im_LabS2LabQ @ im_clip2s],
 	[LABS, UCS, im_Lab2UCS @ im_LabQ2Lab @ im_LabS2LabQ @ im_clip2s],
 	[LABS, RGB, im_LabQ2disp @ im_LabS2LabQ @ im_clip2s],
-	[LABS, sRGB, im_XYZ2sRGB @ 
-		im_Lab2XYZ @ im_LabQ2Lab @ im_LabS2LabQ @ im_clip2s],
+	[LABS, sRGB, im_XYZ2sRGB @ im_Lab2XYZ @ im_LabS2Lab @ im_clip2s],
+	[LABS, scRGB, im_XYZ2scRGB @ im_Lab2XYZ @ im_LabS2Lab @ im_clip2s],
 	[LABS, LABQ, im_LabS2LabQ @ im_clip2s],
 	[LABS, LABS, image_set_type LABS]
 ]
@@ -595,6 +648,7 @@ _colour_conversion_table = [
 	UCS = 18;
 	RGB = 17;
 	sRGB = 22;
+	scRGB = 28;
 	RGB16 = 25;
 	GREY16 = 26;
 	LABQ = 16;
diff --git a/share/nip2/start/_predicate.def b/share/nip2/start/_predicate.def
index 14872802..7fae24a8 100644
--- a/share/nip2/start/_predicate.def
+++ b/share/nip2/start/_predicate.def
@@ -232,6 +232,7 @@ get_type x
 
 	get_type_im im
 		= Image_type.LABQ, coding == Image_coding.LABPACK
+		= Image_type.scRGB, coding == Image_coding.RAD
 		= Image_type.GREY16, type == Image_type.GREY16 && is_bands 1
 		= Image_type.HISTOGRAM, type == Image_type.HISTOGRAM && 
 			(width == 1 || height == 1)
@@ -252,6 +253,7 @@ get_type x
 		// Colour/Convert To menu can make, excluding mono.
 		ok_types = [
 			Image_type.sRGB, 
+			Image_type.scRGB, 
 			Image_type.RGB16, 
 			Image_type.LAB, 
 			Image_type.LABQ, 
diff --git a/share/nip2/start/_types.def b/share/nip2/start/_types.def
index 7516659b..a37575a2 100644
--- a/share/nip2/start/_types.def
+++ b/share/nip2/start/_types.def
@@ -816,6 +816,7 @@ Image_type = class {
 	RGB16 = 25;
 	GREY16 = 26;
 	ARRAY = 27;
+	scRGB = 28;
 
 	/* Table to get names <-> numbers.
 	 */
@@ -836,15 +837,17 @@ Image_type = class {
 		$FOURIER => FOURIER,
 		$RGB16 => RGB16,
 		$GREY16 => GREY16,
-		$ARRAY => ARRAY
+		$ARRAY => ARRAY,
+		$scRGB => scRGB
 	];
 
 	/* Table relating nip's colour space names and VIPS's Type numbers.
-	 * Options generated from this, so match the order to the order in the
-	 * Colour menu.
+	 * Options are generated from this, so match the order to the order in 
+	 * the Colour menu.
 	 */
 	colour_spaces = Enum [
 		$sRGB => sRGB,
+		$scRGB => scRGB,
 		$Lab => LAB,
 		$LCh => LCH,
 		$XYZ => XYZ,
@@ -858,6 +861,7 @@ Image_type = class {
 	image_colour_spaces = Enum [
 		$Mono => B_W,
 		$sRGB => sRGB,
+		$scRGB => scRGB,
 		$RGB16 => RGB16,
 		$GREY16 => GREY16,
 		$Lab => LAB,