diff --git a/internal/support/converter/AddPREFIX.bas b/internal/support/converter/AddPREFIX.bas
index 0f44af1b7..db3df1ba2 100644
--- a/internal/support/converter/AddPREFIX.bas
+++ b/internal/support/converter/AddPREFIX.bas
@@ -544,7 +544,7 @@ SUB add_prefix
 END SUB
 
 SUB maybe_add_prefix
-    IF noprefix_detected AND token.t = TOK_WORD AND ASC(token.uc) <> ASC("_") _ANDALSO is_underscored(token.c) THEN add_prefix
+    IF noprefix_detected AND token.t = TOK_WORD AND ASC(token.uc) <> ASC("_") _ANDALSO is_underscored THEN add_prefix
 END SUB
 
 FUNCTION line_end
@@ -556,7 +556,7 @@ FUNCTION line_end
     END SELECT
 END FUNCTION
 
-FUNCTION is_underscored (s$)
+FUNCTION is_underscored
     DIM i
     FOR i = 1 TO UBOUND(prefix_keywords$)
         IF token.uc = prefix_keywords$(i) THEN
diff --git a/internal/support/include/afterlastline.bm b/internal/support/include/afterlastline.bm
index 9a4d045f0..130c4db7d 100644
--- a/internal/support/include/afterlastline.bm
+++ b/internal/support/include/afterlastline.bm
@@ -56,17 +56,105 @@ $CHECKING:OFF
 '_MIN() returns the lesser of both given values (returns value1 if equal).
 '----------
 FUNCTION _IKW_Min## (_value1##, _value2##)
-    IF _value1## <= _value2## THEN _MIN = _value1## ELSE _MIN = _value2##
+    _MIN = _IIF(_value1## <= _value2##, _value1##, _value2##)
 END FUNCTION
 
 '_MAX() returns the greater of both given values (returns value1 if equal).
 '----------
 FUNCTION _IKW_Max## (_value1##, _value2##)
-    IF _value1## >= _value2## THEN _MAX = _value1## ELSE _MAX = _value2##
+    _MAX = _IIF(_value1## >= _value2##, _value1##, _value2##)
 END FUNCTION
 
-'_EncodeURL$() returns the encoded version of the given plain text URL for
-' use with the _OPENCLIENT("HTTP:url") syntax.
+'_CLAMP() returns the given value or the min/max, if the value is lesser or
+'   greater than that respectively.
+'----------
+FUNCTION _IKW_Clamp## (_value##, _minVal##, _maxVal##)
+    DIM _realMin##, _realMax##
+    _realMin## = _MIN(_minVal##, _maxVal##)
+    _realMax## = _MAX(_minVal##, _maxVal##)
+    _CLAMP = _IIF(_value## < _realMin##, _realMin##, _IIF(_value## > _realMax##, _realMax##, _value##))
+END FUNCTION
+
+'_HSB32() returns the 32-bit ARGB color value build from the given HSB values,
+'   always with full alpha (opaque colors).
+'----------           [0,360]    [0,100]       [0,100]
+FUNCTION _IKW_HSB32~& (_hue#, _saturation#, _brightness#)
+    '--- option _explicit requirements ---
+    DIM _hu#, _sa#, _br#, _re#, _gr#, _bl#
+    '--- prepare values for conversion ---
+    _hu# = _CLAMP(_hue#, 0, 360)
+    _sa# = _CLAMP(_saturation#, 0, 100) / 100
+    _br# = _CLAMP(_brightness#, 0, 100) / 100
+    '--- convert colorspace ---
+    _HSBtoRGB _hu#, _sa#, _br#, _re#, _gr#, _bl#
+    '--- build result ---
+    _HSB32 = _RGB32(CINT(_re# * 255), CINT(_gr# * 255), CINT(_bl# * 255))
+END FUNCTION
+
+'_HSBA32() returns the 32-bit ARGB color value build from the given HSB values,
+'   using 0-100% alpha as given.
+'----------            [0,360]    [0,100]       [0,100]    [0,100]
+FUNCTION _IKW_HSBA32~& (_hue#, _saturation#, _brightness#, _alfa#)
+    '--- option _explicit requirements ---
+    DIM _hu#, _sa#, _br#, _al#, _re#, _gr#, _bl#
+    '--- prepare values for conversion ---
+    _hu# = _CLAMP(_hue#, 0, 360)
+    _sa# = _CLAMP(_saturation#, 0, 100) / 100
+    _br# = _CLAMP(_brightness#, 0, 100) / 100
+    _al# = _CLAMP(_alfa#, 0, 100) / 100
+    '--- convert colorspace ---
+    _HSBtoRGB _hu#, _sa#, _br#, _re#, _gr#, _bl#
+    '--- build result ---
+    _HSBA32 = _RGBA32(CINT(_re# * 255), CINT(_gr# * 255), CINT(_bl# * 255), CINT(_al# * 255))
+END FUNCTION
+
+'_HUE32() returns the hue [0,360] of the given 32-bit ARGB color value.
+'----------
+FUNCTION _IKW_HUE32# (_argbColor~&)
+    '--- option _explicit requirements ---
+    DIM _re#, _gr#, _bl#, _hu#, _sa#, _br#
+    '--- prepare values for conversion ---
+    _re# = _RED32(_argbColor~&) / 255
+    _gr# = _GREEN32(_argbColor~&) / 255
+    _bl# = _BLUE32(_argbColor~&) / 255
+    '--- convert colorspace ---
+    _RGBtoHSB _re#, _gr#, _bl#, _hu#, _sa#, _br#
+    '--- build result ---
+    _HUE32 = _hu#
+END FUNCTION
+
+'_SATURATION32() returns the saturation [0,100] of the given 32-bit ARGB color value.
+'----------
+FUNCTION _IKW_SATURATION32# (_argbColor~&)
+    '--- option _explicit requirements ---
+    DIM _re#, _gr#, _bl#, _hu#, _sa#, _br#
+    '--- prepare values for conversion ---
+    _re# = _RED32(_argbColor~&) / 255
+    _gr# = _GREEN32(_argbColor~&) / 255
+    _bl# = _BLUE32(_argbColor~&) / 255
+    '--- convert colorspace ---
+    _RGBtoHSB _re#, _gr#, _bl#, _hu#, _sa#, _br#
+    '--- build result ---
+    _SATURATION32 = _sa# * 100
+END FUNCTION
+
+'_BRIGHTNESS32() returns the brightness [0,100] of the given 32-bit ARGB color value.
+'----------
+FUNCTION _IKW_BRIGHTNESS32# (_argbColor~&)
+    '--- option _explicit requirements ---
+    DIM _re#, _gr#, _bl#, _hu#, _sa#, _br#
+    '--- prepare values for conversion ---
+    _re# = _RED32(_argbColor~&) / 255
+    _gr# = _GREEN32(_argbColor~&) / 255
+    _bl# = _BLUE32(_argbColor~&) / 255
+    '--- convert colorspace ---
+    _RGBtoHSB _re#, _gr#, _bl#, _hu#, _sa#, _br#
+    '--- build result ---
+    _BRIGHTNESS32 = _br# * 100
+END FUNCTION
+
+'_EncodeURL$() returns the percent encoded version of the given plain text
+'   URL for use with the _OPENCLIENT("HTTP:url") syntax.
 '----------
 FUNCTION _IKW_EncodeURL$ (_url$)
     '24 OCT 2024: First implementation based on the informations found on the website;
@@ -134,9 +222,76 @@ END FUNCTION
 ' rule #2 its names must begin with an underscore.
 '==========================================================================
 
+'_HSBtoRGB() converts colors from the HSB into the RGB colorspace. Note that
+'   HSB (B=Brightness) is also known as HSV (V=Value) and sometimes called
+'   HSI (I=Intensity), but that's just different names for the same thing.
+'   However, this SUB is not suitable for the HSL (L=Lightness) colorspace.
+'----------
+' IN: hu# = [0,360], sa# = [0,1], br# = [0,1]
+'OUT: re#, gr#, bl# values in range [0,1] (through arguments)
+'----------
+SUB _HSBtoRGB (_hu#, _sa#, _br#, _re#, _gr#, _bl#)
+    '--- option _explicit requirements ---
+    DIM _hi%, _hf#, _pv#, _qv#, _tv#
+    '--- compute RGB ---
+    IF _sa# = 0 THEN
+        _re# = _br#: _gr# = _br#: _bl# = _br# 'no saturation = grayscale
+    ELSE
+        _hu# = _hu# / 60 '                   'to sixtant [0,5]
+        IF _hu# >= 6 THEN _hu# = _hu# - 6
+        _hi% = INT(_hu#): _hf# = _hu# - _hi% 'int/frac parts of hue
+        _pv# = _br# * (1 - _sa#)
+        _qv# = _br# * (1 - (_sa# * _hf#))
+        _tv# = _br# * (1 - (_sa# * (1 - _hf#)))
+        SELECT CASE _hi%
+            CASE 0: _re# = _br#: _gr# = _tv#: _bl# = _pv# '  0- 60 = Red->Yellow
+            CASE 1: _re# = _qv#: _gr# = _br#: _bl# = _pv# ' 60-120 = Yellow->Green
+            CASE 2: _re# = _pv#: _gr# = _br#: _bl# = _tv# '120-180 = Green->Cyan
+            CASE 3: _re# = _pv#: _gr# = _qv#: _bl# = _br# '180-240 = Cyan->Blue
+            CASE 4: _re# = _tv#: _gr# = _pv#: _bl# = _br# '240-300 = Blue->Magenta
+            CASE 5: _re# = _br#: _gr# = _pv#: _bl# = _qv# '300-360 = Magenta->Red
+        END SELECT
+    END IF
+END SUB
+
+'_RGBtoHSB() converts colors from the RGB into the HSB colorspace. Note that
+'   HSB (B=Brightness) is also known as HSV (V=Value) and sometimes called
+'   HSI (I=Intensity), but that's just different names for the same thing.
+'   However, this SUB is not suitable for the HSL (L=Lightness) colorspace.
+'----------
+' IN: re#, gr#, bl# values in range [0,1]
+'OUT: hu# = [0,360], sa# = [0,1], br# = [0,1] (through arguments)
+'----------
+SUB _RGBtoHSB (_re#, _gr#, _bl#, _hu#, _sa#, _br#)
+    '--- option _explicit requirements ---
+    DIM _mini#, _maxi#, _diff#
+    '--- find min/max and difference ---
+    _mini# = _MIN(_MIN(_re#, _gr#), _bl#)
+    _maxi# = _MAX(_MAX(_re#, _gr#), _bl#)
+    _diff# = _maxi# - _mini#
+    '--- brightness ---
+    _br# = _maxi#
+    '--- saturation (avoid division by zero) ---
+    IF _maxi# <> 0 THEN _sa# = _diff# / _maxi# ELSE _sa# = 0
+    '--- hue in degrees ---
+    IF _sa# <> 0 THEN
+        IF _re# = _maxi# THEN
+            _hu# = ((_gr# - _bl#) / _diff#) '   'between Yellow & Magenta
+            IF _hu# < 0 THEN _hu# = _hu# + 6
+        ELSEIF _gr# = _maxi# THEN
+            _hu# = 2 + ((_bl# - _re#) / _diff#) 'between Cyan & Yellow
+        ELSE
+            _hu# = 4 + ((_re# - _gr#) / _diff#) 'between Magenta & Cyan
+        END IF
+        _hu# = _hu# * 60 'to degrees
+    ELSE
+        _hu# = 0 'technically there's no hue w/o saturation, commonly used is 0 (red)
+    END IF
+END SUB
+
 $IF _SOCKETS_ THEN
     '_WhatIsMyIP$() is a helper function required by _CONNECTIONADDRESS$,
-    'but only required when network stuff is compiled in (_SOCKETS_).
+    '   but only required when network stuff is compiled in (_SOCKETS_).
     '----------
     FUNCTION _WhatIsMyIP$
         '01 NOV 2024: Make it part of this file, i.e. deprecating internal/c/myip.cpp;
diff --git a/source/subs_functions/syntax_highlighter_list.bas b/source/subs_functions/syntax_highlighter_list.bas
index c8b5576f7..d1a1a9716 100644
--- a/source/subs_functions/syntax_highlighter_list.bas
+++ b/source/subs_functions/syntax_highlighter_list.bas
@@ -14,13 +14,13 @@ listOfKeywords$ = listOfKeywords$ +_
 
 ' [B] - Keywords alphabetical (1st line = QB64, 2nd line = QB4.5, 3rd line = OpenGL)
 listOfKeywords$ = listOfKeywords$ +_
-"_BEHIND@_BIN$@_BIT@_BLEND@_BLINK@_BLUE@_BLUE32@_BUTTON@_BUTTONCHANGE@_BYTE@" +_
+"_BEHIND@_BIN$@_BIT@_BLEND@_BLINK@_BLUE@_BLUE32@_BRIGHTNESS32@_BUTTON@_BUTTONCHANGE@_BYTE@" +_
 "BASE@BEEP@BINARY@BLOAD@BSAVE@BYVAL@" +_
 "_GLBEGIN@_GLBINDTEXTURE@_GLBITMAP@_GLBLENDFUNC@"
 
 ' [C] - Keywords alphabetical (1st line = QB64, 2nd line = QB4.5, 3rd line = OpenGL)
 listOfKeywords$ = listOfKeywords$ +_
-"_CAPSLOCK@_CAST@_CEIL@_CINP@_CLEAR@_CLEARCOLOR@_CLIP@_CLIPBOARD$@_CLIPBOARDIMAGE@_CLOCKWISE@_COLORCHOOSERDIALOG@_COMMANDCOUNT@_CONNECTED@_CONNECTIONADDRESS@_CONNECTIONADDRESS$@_CONSOLE@_CONSOLECURSOR@_CONSOLEFONT@_CONSOLEINPUT@_CONSOLETITLE@_CONTINUE@_CONTROLCHR@_COPYIMAGE@_COPYPALETTE@_COSH@_COT@_COTH@_CRC32@_CSC@_CSCH@_CV@_CWD$@" +_
+"_CAPSLOCK@_CAST@_CEIL@_CINP@_CLAMP@_CLEAR@_CLEARCOLOR@_CLIP@_CLIPBOARD$@_CLIPBOARDIMAGE@_CLOCKWISE@_COLORCHOOSERDIALOG@_COMMANDCOUNT@_CONNECTED@_CONNECTIONADDRESS@_CONNECTIONADDRESS$@_CONSOLE@_CONSOLECURSOR@_CONSOLEFONT@_CONSOLEINPUT@_CONSOLETITLE@_CONTINUE@_CONTROLCHR@_COPYIMAGE@_COPYPALETTE@_COSH@_COT@_COTH@_CRC32@_CSC@_CSCH@_CV@_CWD$@" +_
 "CALL@CALLS@CASE@CDBL@CDECL@CHAIN@CHDIR@CHR$@CINT@CIRCLE@CLEAR@CLNG@CLOSE@CLS@COLOR@COM@COMMAND$@COMMON@CONSOLE@CONST@COS@CSNG@CSRLIN@CUSTOMTYPE@CVD@CVDMBF@CVI@CVL@CVS@CVSMBF@" +_
 "_GLCALLLIST@_GLCALLLISTS@_GLCLEAR@_GLCLEARACCUM@_GLCLEARCOLOR@_GLCLEARDEPTH@_GLCLEARINDEX@_GLCLEARSTENCIL@_GLCLIPPLANE@_GLCOLOR3B@_GLCOLOR3BV@_GLCOLOR3D@_GLCOLOR3DV@_GLCOLOR3F@_GLCOLOR3FV@_GLCOLOR3I@_GLCOLOR3IV@_GLCOLOR3S@_GLCOLOR3SV@_GLCOLOR3UB@_GLCOLOR3UBV@_GLCOLOR3UI@_GLCOLOR3UIV@_GLCOLOR3US@_GLCOLOR3USV@_GLCOLOR4B@_GLCOLOR4BV@_GLCOLOR4D@_GLCOLOR4DV@_GLCOLOR4F@_GLCOLOR4FV@_GLCOLOR4I@_GLCOLOR4IV@_GLCOLOR4S@_GLCOLOR4SV@_GLCOLOR4UB@_GLCOLOR4UBV@_GLCOLOR4UI@_GLCOLOR4UIV@_GLCOLOR4US@_GLCOLOR4USV@_GLCOLORMASK@_GLCOLORMATERIAL@_GLCOLORPOINTER@_GLCOPYPIXELS@_GLCOPYTEXIMAGE1D@_GLCOPYTEXIMAGE2D@_GLCOPYTEXSUBIMAGE1D@_GLCOPYTEXSUBIMAGE2D@_GLCULLFACE@"
 
@@ -50,7 +50,7 @@ listOfKeywords$ = listOfKeywords$ +_
 
 ' [H] - Keywords alphabetical (1st line = QB64, 2nd line = QB4.5, 3rd line = OpenGL)
 listOfKeywords$ = listOfKeywords$ +_
-"_HARDWARE@_HARDWARE1@_HEIGHT@_HIDE@_HYPOT@" +_
+"_HARDWARE@_HARDWARE1@_HEIGHT@_HIDE@_HSB32@_HSBA32@_HUE32@_HYPOT@" +_
 "HEX$@" +_
 "_GLHINT@"
 
@@ -116,7 +116,7 @@ listOfKeywords$ = listOfKeywords$ +_
 
 ' [S] - Keywords alphabetical (1st line = QB64, 2nd line = QB4.5, 3rd line = OpenGL)
 listOfKeywords$ = listOfKeywords$ +_
-"_SAVEFILEDIALOG$@_SAVEIMAGE@_SCALEDHEIGHT@_SCALEDWIDTH@_SCREENCLICK@_SCREENEXISTS@_SCREENHIDE@_SCREENICON@_SCREENIMAGE@_SCREENMOVE@_SCREENPRINT@_SCREENSHOW@_SCREENX@_SCREENY@_SCROLLLOCK@_SEAMLESS@_SEC@_SECH@_SELECTFOLDERDIALOG$@_SETALPHA@_SETBIT@_SHELLHIDE@_SHL@_SHOW@_SHR@_SINH@_SMOOTH@_SMOOTHSHRUNK@_SMOOTHSTRETCHED@_SNDBAL@_SNDCLOSE@_SNDCOPY@_SNDGETPOS@_SNDLEN@_SNDLIMIT@_SNDLOOP@_SNDNEW@_SNDOPEN@_SNDOPENRAW@_SNDPAUSE@_SNDPAUSED@_SNDPLAY@_SNDPLAYCOPY@_SNDPLAYFILE@_SNDPLAYING@_SNDRATE@_SNDRAW@_SNDRAWBATCH@_SNDRAWDONE@_SNDRAWLEN@_SNDSETPOS@_SNDSTOP@_SNDVOL@_SOFTWARE@_SOURCE@_SQUAREPIXELS@_STARTDIR$@_STATUSCODE@_STRCMP@_STRETCH@_STRICMP@" +_
+"_SATURATION32@_SAVEFILEDIALOG$@_SAVEIMAGE@_SCALEDHEIGHT@_SCALEDWIDTH@_SCREENCLICK@_SCREENEXISTS@_SCREENHIDE@_SCREENICON@_SCREENIMAGE@_SCREENMOVE@_SCREENPRINT@_SCREENSHOW@_SCREENX@_SCREENY@_SCROLLLOCK@_SEAMLESS@_SEC@_SECH@_SELECTFOLDERDIALOG$@_SETALPHA@_SETBIT@_SHELLHIDE@_SHL@_SHOW@_SHR@_SINH@_SMOOTH@_SMOOTHSHRUNK@_SMOOTHSTRETCHED@_SNDBAL@_SNDCLOSE@_SNDCOPY@_SNDGETPOS@_SNDLEN@_SNDLIMIT@_SNDLOOP@_SNDNEW@_SNDOPEN@_SNDOPENRAW@_SNDPAUSE@_SNDPAUSED@_SNDPLAY@_SNDPLAYCOPY@_SNDPLAYFILE@_SNDPLAYING@_SNDRATE@_SNDRAW@_SNDRAWBATCH@_SNDRAWDONE@_SNDRAWLEN@_SNDSETPOS@_SNDSTOP@_SNDVOL@_SOFTWARE@_SOURCE@_SQUAREPIXELS@_STARTDIR$@_STATUSCODE@_STRCMP@_STRETCH@_STRICMP@" +_
 "SADD@SCREEN@SEEK@SEG@SELECT@SETMEM@SGN@SHARED@SHELL@SIGNAL@SIN@SINGLE@SLEEP@SMOOTH@SOUND@SPACE$@SPC@SQR@STATIC@STEP@STICK@STOP@STR$@STRETCH@STRIG@STRING@STRING$@SUB@SWAP@SYSTEM@" +_
 "_GLSCALED@_GLSCALEF@_GLSCISSOR@_GLSELECTBUFFER@_GLSHADEMODEL@_GLSTENCILFUNC@_GLSTENCILMASK@_GLSTENCILOP@"
 
diff --git a/tests/compile_tests/colors/test.bas b/tests/compile_tests/colors/test.bas
index fb56c7062..7b5cd6f2b 100644
--- a/tests/compile_tests/colors/test.bas
+++ b/tests/compile_tests/colors/test.bas
@@ -1,8 +1,33 @@
-$Console:Only
+$CONSOLE:ONLY
 
-Print "Grey, max alpha: "; Hex$(_RGB32(&H7F))
-Print "Grey, half alpha: "; Hex$(_RGB32(&H7F, &H7F))
-Print "Grey, max alpha: "; Hex$(_RGB32(&H7F, &H7F, &H7F))
-Print "Grey, half alpha: "; Hex$(_RGB32(&H7F, &H7F, &H7F, &H7F))
+PRINT "RGB functions forward"
+PRINT "Grey, max alpha: "; HEX$(_RGB32(127))
+PRINT "Grey, half alpha: "; HEX$(_RGB32(127, 127))
+PRINT "Grey, max alpha: "; HEX$(_RGB32(127, 127, 127))
+PRINT "Grey, half alpha: "; HEX$(_RGB32(127, 127, 127, 127))
+
+c~& = _RGBA32(80, 128, 160, 32)
+PRINT
+PRINT "RGB functions backward _RGBA32(80, 128, 160, 32)"
+PRINT "Red..:"; _RED32(c~&)
+PRINT "Green:"; _GREEN32(c~&)
+PRINT "Blue.:"; _BLUE32(c~&)
+PRINT "Alpha:"; _ALPHA32(c~&)
+
+PRINT
+PRINT "HSB functions forward"
+PRINT "Red, max alpha: "; HEX$(_HSB32(0, 100, 100))
+PRINT "Red, half alpha: "; HEX$(_HSBA32(0, 100, 100, 50))
+PRINT "Midgreen, max alpha: "; HEX$(_HSB32(120, 75, 75))
+PRINT "Midgreen, 3/4 alpha: "; HEX$(_HSBA32(120, 75, 75, 75))
+
+c~& = _HSBA32(90, 75, 65, 55)
+PRINT
+PRINT "HSB functions backward _HSBA32(90, 75, 65, 55)"
+PRINT "Hue.......:"; CINT(_HUE32(c~&))
+PRINT "Saturation:"; CINT(_SATURATION32(c~&))
+PRINT "Brightness:"; CINT(_BRIGHTNESS32(c~&))
+PRINT "Alpha.....:"; CINT(_ALPHA32(c~&) / 255 * 100)
+
+SYSTEM
 
-System
diff --git a/tests/compile_tests/colors/test.output b/tests/compile_tests/colors/test.output
index 640e0a9e5..9a6105f8b 100644
--- a/tests/compile_tests/colors/test.output
+++ b/tests/compile_tests/colors/test.output
@@ -1,4 +1,23 @@
+RGB functions forward
 Grey, max alpha: FF7F7F7F
 Grey, half alpha: 7F7F7F7F
 Grey, max alpha: FF7F7F7F
 Grey, half alpha: 7F7F7F7F
+
+RGB functions backward _RGBA32(80, 128, 160, 32)
+Red..: 80 
+Green: 128 
+Blue.: 160 
+Alpha: 32 
+
+HSB functions forward
+Red, max alpha: FFFF0000
+Red, half alpha: 80FF0000
+Midgreen, max alpha: FF30BF30
+Midgreen, 3/4 alpha: BF30BF30
+
+HSB functions backward _HSBA32(90, 75, 65, 55)
+Hue.......: 90 
+Saturation: 75 
+Brightness: 65 
+Alpha.....: 55