+(defun test-color-conversion-float-255 ()
+ (dotimes (ih 11)
+ (dotimes (is 11)
+ (dotimes (iv 11)
+ (let ((h (* ih 30))
+ (s (/ is 10))
+ (v (/ iv 10)))
+ (multiple-value-bind (r g b) (hsv->rgb h s v)
+ (setf r (round (* 255 r))
+ g (round (* 255 g))
+ b (round (* 255 b)))
+ (multiple-value-bind (h2 s2 v2) (rgb255->hsv255 r g b)
+ (unless (hsv-similar h s v h2 (/ s2 255) (/ v2 255)
+ :hue-range 10 :saturation-range .1
+ :value-range 1 :black-limit 0 :gray-limit 0)
+ (warn "Colors not equal: ~4D ~4D ~4D | ~6D:~6D ~6D:~6D ~6D:~6D~%"
+ r g b
+ (when (typep h 'number) (float h))
+ (when (typep h2 'number) (float h2))
+ (float s) (float (/ s2 255)) (float v) (float (/ v2 255)))
+ (return-from test-color-conversion-float-255 nil))))))))
+ t)
+
+(defun test-color-conversion-255-float ()
+ (dotimes (ih 11)
+ (dotimes (is 11)
+ (dotimes (iv 11)
+ (let ((h (* ih 30))
+ (s (/ is 10))
+ (v (/ iv 10)))
+ (multiple-value-bind (r g b) (hsv255->rgb255 h (truncate (* 255 s))
+ (truncate (* 255 v)))
+ (setf r (/ r 255)
+ g (/ g 255)
+ b (/ b 255))
+
+ (multiple-value-bind (h2 s2 v2) (rgb->hsv r g b)
+ (unless (hsv-similar h s v h2 s2 v2
+ :hue-range 10 :saturation-range .1
+ :value-range 1 :black-limit 0 :gray-limit 0)
+ (warn "Colors not equal: ~4D ~4D ~4D | ~6D:~6D ~6D:~6D ~6D:~6D~%"
+ r g b
+ (when (typep h 'number) (float h))
+ (when (typep h2 'number) (float h2))
+ (float s) (float (/ s2 255)) (float v) (float (/ v2 255)))
+ (return-from test-color-conversion-255-float nil))))))))
+ t)
+
+(defun test-color-conversion-255 ()
+ (dotimes (ih 11)
+ (dotimes (is 11)
+ (dotimes (iv 11)
+ (let ((h (* ih 30))
+ (s (truncate (* 255 (/ is 10))))
+ (v (truncate (* 255 (/ iv 10)))))
+ (multiple-value-bind (r g b) (hsv255->rgb255 h s v)
+ (multiple-value-bind (h2 s2 v2) (rgb255->hsv255 r g b)
+ (unless (hsv255-similar h s v h2 s2 v2 :hue-range 10 :saturation-range 5
+ :value-range 5 :black-limit 0 :gray-limit 0)
+ (warn "Colors not equal: ~D ~D ~D |~
+ ~3,'0D:~3,'0D ~3,'0D:~3,'0D ~3,'0D:~3,'0D~%"
+ r g b
+ h h2 s s2 v v2)
+ (return-from test-color-conversion-255 nil))))))))
+ t)
+
+(deftest color.conv (test-color-conversion) t)
+(deftest color.conv.float.255 (test-color-conversion-float-255) t)
+(deftest color.conv.255.float (test-color-conversion-255-float) t)
+(deftest color.conv.255 (test-color-conversion-255) t)
+
+(deftest hue.diff.1 (hue-difference 10 10) 0)
+(deftest hue.diff.2 (hue-difference 10 9) -1)
+(deftest hue.diff.3 (hue-difference 9 10) 1)
+(deftest hue.diff.4 (hue-difference 10 nil) nil)
+(deftest hue.diff.5 (hue-difference nil 1) nil)
+(deftest hue.diff.7 (hue-difference 10 190) 180)
+(deftest hue.diff.8 (hue-difference 190 10) -180)
+(deftest hue.diff.9 (hue-difference 1 359) -2)
+(deftest hue.diff.10 (hue-difference 1 182) -179)
+(deftest hue.diff.11 (hue-difference 1 270) -91)
+
+(deftest hsv.sim.1 (hsv-similar 100 .5 .5 110 .5 .5 :hue-range 5
+ :value-range 0 :saturation-range 0
+ :black-limit 0 :gray-limit 0) nil)
+(deftest hsv.sim.2 (hsv-similar 100 .5 .5 110 .5 .5 :hue-range 15
+ :value-range 0 :saturation-range 0
+ :black-limit 0 :gray-limit 0) t)
+(deftest hsv.sim.3 (hsv-similar 100 .5 .5 110 .5 .6 :hue-range 15
+ :value-range .2 :saturation-range 0
+ :black-limit 0 :gray-limit 0) t)
+(deftest hsv.sim.4 (hsv-similar 100 .5 .5 110 .5 .8 :hue-range 15
+ :value-range 0.2 :saturation-range 0
+ :black-limit 0 :gray-limit 0) nil)
+(deftest hsv.sim.5 (hsv-similar 100 .5 .5 110 .6 .6 :hue-range 15
+ :value-range 0.2 :saturation-range .2
+ :black-limit 0 :gray-limit 0) t)
+(deftest hsv.sim.6 (hsv-similar 100 .5 .5 110 .6 .8 :hue-range 15
+ :value-range 0.2 :saturation-range .2
+ :black-limit 0 :gray-limit 0) nil)
+(deftest hsv.sim.7 (hsv-similar 100 .5 .05 110 .6 .01 :hue-range 0
+ :value-range 0 :saturation-range 0
+ :black-limit .1 :gray-limit 0) t)
+(deftest hsv.sim.8 (hsv-similar 100 .01 .5 110 .09 .6 :hue-range 0
+ :value-range 0.2 :saturation-range 0
+ :black-limit 0 :gray-limit .1) t)
+(deftest hsv.sim.9 (hsv-similar 100 .01 .5 110 .09 .6 :hue-range 0
+ :value-range 0.05 :saturation-range 0
+ :black-limit 0 :gray-limit .1) nil)