What color space is this?

[mcriley821]

I came across a weird difference of colors by passing in an un-normalized RGB tuple to the ui.set_color function. I was wanting just regular green (#00ff00) but instead I got a neon green.

It happens anytime the green value is greater than 1 in the tuple. It stays the same after 2, so it’s almost as if it’s brightness is mapped from 1-> 2.

What color space is this? I want to take full advantage of this in the color picker!

import ui


class Colors (ui.View):
	def __init__(self, *args, **kwargs):
		return super().__init__(self, *args, **kwargs)
	
	def draw(self):
		neon = ui.Path.rect(5, 5, 100, 100)
		ui.set_color((0, 2, 0))
		neon.fill()
		
		normal = ui.Path.rect(110, 5, 100, 100)
		ui.set_color(("#00ff00"))
		normal.fill()


example = Colors(bg_color="white")
example.present() 

[cvp]

Try, this script, then

• tap on the button, then on the syringe
• you will receive a viewfinder (no way to get it in the print screen ) that you move on one of your squares,
• tap ok, the real rgb will appear, surprise, no one is #00FF00

# coding: utf-8
from objc_util import *
import ui

def colorPickerViewControllerDidFinish_(_self, _cmd, _controller):
	#print('colorPickerViewControllerDidFinish')
	UIColorPickerViewController = ObjCInstance(_controller)
		
def colorPickerViewControllerDidSelectColor_(_self, _cmd, _controller):
	#print('colorPickerViewControllerDidSelectColor')
	UIColorPickerViewController = ObjCInstance(_controller)
	cl = UIColorPickerViewController.selectedColor()
	rgb = (cl.red(),cl.green(),cl.blue())
	coloredButtonItem(UIColorPickerViewController.buttonItem, rgb)

methods = [colorPickerViewControllerDidFinish_, colorPickerViewControllerDidSelectColor_]
protocols = ['UIColorPickerViewControllerDelegate']
try:
		MyUIColorPickerViewControllerDelegate = ObjCClass('MyUIColorPickerViewControllerDelegate')
except Exception as e:
	MyUIColorPickerViewControllerDelegate = create_objc_class('MyUIColorPickerViewControllerDelegate', methods=methods, protocols=protocols)
	
def coloredButtonItem(btn,rgb):
	import ui
	if rgb:
		with ui.ImageContext(32,32) as ctx: 
			path = ui.Path.rect(0,0,32,32)
			ui.set_color(rgb)
			path.fill()		
			btn.image = ctx.get_image().with_rendering_mode(ui.RENDERING_MODE_ORIGINAL)

def UIColorPickerViewController(w, h, alpha_slider=True, title='', rgb=None, popover=None):
	v = ui.View()
	v.name = title
	v.rgb = rgb
	vc = ObjCInstance(v)
	colorpicker = ObjCClass('UIColorPickerViewController').new().autorelease()
	#print(dir(colorpicker))
	delegate = MyUIColorPickerViewControllerDelegate.alloc().init()
	colorpicker.delegate = delegate	
	
	colorpicker.setSupportsAlpha_(alpha_slider)	
	if rgb:
		color = ObjCClass('UIColor').colorWithRed_green_blue_alpha_(rgb[0], rgb[1], rgb[2], 1.0)
		colorpicker.setSelectedColor_(color)

	clview = colorpicker.view()
	v.frame = (0,0,w,h)
	vc.addSubview_(clview)
	done_button = ui.ButtonItem(title='ok')
	def tapped(sender):
		cl = colorpicker.selectedColor()
		v.rgb = (cl.red(),cl.green(),cl.blue())
		v.close()
	done_button.action = tapped
	color_button = ui.ButtonItem()
	coloredButtonItem(color_button,rgb)
	v.right_button_items = [done_button,color_button]

	colorpicker.buttonItem = color_button
	
	if popover:
		x,y = popover
		v.present('popover', popover_location=(x,y))
	else:
		v.present('sheet')

	v.wait_modal()
	return v.rgb 	
	
def rgb_to_hex(rgb):
	r,g,b = rgb
	r = int(255*r)
	g = int(255*g)
	b = int(255*b)
	return f'#{r:02x}{g:02x}{b:02x}'
	
class Colors (ui.View):
    def __init__(self, *args, **kwargs):
        return super().__init__(self, *args, **kwargs)
    
    def draw(self):
        neon = ui.Path.rect(5, 5, 100, 100)
        ui.set_color((0, 2, 0))
        neon.fill()
        
        normal = ui.Path.rect(110, 5, 100, 100)
        ui.set_color(("#00ff00"))
        normal.fill()

	
# Protect against import	
if __name__ == '__main__':
	example = Colors(bg_color="white")
	lbl = ui.Label(frame=(5,120,200,32))
	lbl.alignment = ui.ALIGN_CENTER
	example.add_subview(lbl)
	b1 = ui.ButtonItem()
	b1.title = '💉'
	def b1_action(sender):
		# compute x,y of an ui.ButtonItem
		vi = ObjCInstance(sender).view()
		r = vi.convertRect_toView_(vi.bounds(),ObjCInstance(example))
		# x,y in screen coordinates, not in view
		x,y,w,h = r.origin.x,r.origin.y,r.size.width,r.size.height
		x,y = x+w/2, y+h
		w,h = 200,50
		rgb = UIColorPickerViewController(w,h, alpha_slider=False, popover=(x,y))
		if rgb:
			lbl.text = rgb_to_hex(rgb)
	b1.action = b1_action
	example.right_button_items =(b1,)
	example.present('fullscreen')