User:Kim Bruning/colorspace.py: Difference between revisions

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Revision as of 09:03, 7 April 2004 editKim Bruning (talk \| contribs)Autopatrolled, Extended confirmed users, Pending changes reviewers, Rollbackers20,995 edits thanks for fixing the code, modified slightly for encyclopedic answers :)← Previous edit		Latest revision as of 15:49, 8 May 2022 edit undoQwerfjkl (bot) (talk \| contribs)Bots, Mass message senders4,012,478 editsm →top: Replaced deprecated <source> tags with <syntaxhighlight>Tag: AWB
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	<pre>

			<syntaxhighlight lang=python>
	#!/usr/bin/python		#!/usr/bin/python
			# colorspace.py
			# calculates RGB, CMYK and HSV values from a hex triplet


	# Diclaimer:		# Diclaimer:
	# I only just picked up python. No apologies are made for this code.		# I only just picked up python. No apologies are made for this code.
			# Dysprosia and Chinasaur helped with formulas for CMYK and HSV respectively

	def hextriplet2rgb(triplet) :		def hextriplet2rgb(triplet) :
	~~# assuming the~~ triplet isn't prefixed with 0x		value=int(triplet, 16)
	value=eval("0x"+triplet)
	r=(value & 0xFF0000) / 0x10000		r=(value & 0xFF0000) / 0x10000
	g=(value & 0x00FF00) / 0x100		g=(value & 0x00FF00) / 0x100
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	# Using a "undefined" instead of None		# Using a "undefined" instead of None
	# because: ~~human~~ ~~readable~~ ~~input~~		# because we want encyclopedic style output
	h="undefined" #default		h="undefined" #default
	s="undefined" #default		s="undefined" #default
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	v=MAX		v=MAX

	if (v > 0) :		if v > 0 :
	s = (MAX - MIN) / MAX		s = (MAX - MIN) / MAX

	if (s > 0 and s != "undefined" ):		if s > 0 and s != "undefined" :
	if r == MAX: h=(0.0+( (g-b)/(MAX-MIN) ))*60		if r == MAX: h=(0.0+( (g-b)/(MAX-MIN) ))*60
	if g == MAX: h=(2.0+( (b-r)/(MAX-MIN) ))*60		if g == MAX: h=(2.0+( (b-r)/(MAX-MIN) ))*60
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	H=h		H=h
	if ( h != "undefined" ):		if h != "undefined" :
	if h < 0: h+=360		if h < 0: h+=360
	H=int(h)		H=int(round(h))
	S=s		S=s
	if (s!= "undefined") : S=int(s*100)		if s!= "undefined" : S=int(round(s*100))

	V=int(v*100)		V=int(round(v*100))

	return (H,S,V)		return (H,S,V)
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			</syntaxhighlight>
	</pre>

Latest revision as of 15:49, 8 May 2022

> example run

#!/usr/bin/python
# colorspace.py
# calculates RGB, CMYK and HSV values from a hex triplet
# Diclaimer: 
# I only just picked up python. No apologies are made for this code.
# Dysprosia and Chinasaur helped with formulas for CMYK and HSV respectively
def hextriplet2rgb(triplet) :
        value=int(triplet, 16)
        r=(value & 0xFF0000) / 0x10000
        g=(value & 0x00FF00) /   0x100
        b=(value & 0x0000FF) 
        return (r,g,b)
# from http://en.wikipedia.org/CMYK
def rgb2cmyk (rgb) :
        r,g,b=rgb
        c,m,y=(1 - r / 255.0,1 - g / 255.0,1 - b / 255.0)
        C,M,Y,K= (c-min(c,m,y),m-min(c,m,y),y-min(c,m,y),min(c,m,y))
        # and additionally, *255 to convert proportion up to 8bits
        return tuple(map (lambda proportion: int(proportion*255), ))
# from http://en.wikipedia.org/HSV_color_space
def rgb2hsv (rgb) :
        # formula takes fp, bother!
        r,g,b = map (lambda x : x/255.0, rgb)
        MAX=max(r,g,b)
        MIN=min(r,g,b)
        # Using a "undefined" instead of None 
        # because we want encyclopedic style output
        h="undefined" #default
        s="undefined" #default
        v=MAX
        if v > 0 :
                s = (MAX - MIN) / MAX 
        if s > 0 and s != "undefined" :
                if r == MAX: h=(0.0+( (g-b)/(MAX-MIN) ))*60
                if g == MAX: h=(2.0+( (b-r)/(MAX-MIN) ))*60
                if b == MAX: h=(4.0+( (r-g)/(MAX-MIN) ))*60
        # Format
        H=h
        if h != "undefined" :
                if h < 0: h+=360
                H=int(round(h))
        S=s
        if s!= "undefined" : S=int(round(s*100))
        V=int(round(v*100))
        return (H,S,V)
while True:
        print "\n\n"
        print "== Color Coordinates =="
        hextriplet = raw_input(" \'\'\']\'\'\' = #")
        rgb=hextriplet2rgb(hextriplet)
        print " \'\'\']\'\'\'    (r, g, b)    = ",rgb
        print " \'\'\']\'\'\'   (c, m, y, k) = ",rgb2cmyk(rgb)
        print " \'\'\']\'\'\'    (h, s, v)    = ",rgb2hsv(rgb)