Regarding grayscale/desaturation
Posted: Tue Jan 19, 2021 12:03 am
Hello! I've got a bunch of feature requests regarding desaturation.
On the Smart Color Correction feature, the Output Saturation seems to be using Rec. 601:
(0.30 * r) + (0.59 * g) + (0.11 * b)
Based on that same formula, I think the next features would be useful:
- A toggle to quickly visualize the painting desaturated, this can be useful to check values.
- Hue Jitter in the brushes should use the formula above to choose it's colors, so the values are consistent.
The last option can be really useful to make paintings with a more impressionist style, as you make sure the hues will respect the value of the selected color.
I've tried to create a python app to get a color with the same value as the input color, it's brute-forcing it with recursion:
This is ugly but it works. The desaturation formula is a plane, if you randomly select a r and g value between 0-1, you can then solve the formula, finding b so the formula is equal to the value of the current selected color. I don't know math (couldn't limit b to 0-1) so I had to brute-force it.
I think these features could be great to make color paintings easier
Thanks!
On the Smart Color Correction feature, the Output Saturation seems to be using Rec. 601:
(0.30 * r) + (0.59 * g) + (0.11 * b)
Based on that same formula, I think the next features would be useful:
- A toggle to quickly visualize the painting desaturated, this can be useful to check values.
- Hue Jitter in the brushes should use the formula above to choose it's colors, so the values are consistent.
The last option can be really useful to make paintings with a more impressionist style, as you make sure the hues will respect the value of the selected color.
I've tried to create a python app to get a color with the same value as the input color, it's brute-forcing it with recursion:
Code: Select all
import random
def GetGrayscale(r, g, b):
value = (0.30 * r) + (0.59 * g) + (0.11 * b)
return value
treshold = 0.0008
userR = float(input("r: "))
userG = float(input("g: "))
userB = float(input("b: "))
targetValue = round(GetGrayscale(userR, userG, userB), 3)
print(f"Target: {targetValue}")
attempts = 0
def GetB():
global attempts
attempts+=1
r = random.random()
g = random.random()
b = (targetValue - ((0.30 * userR) + (0.59 * userG))) / 0.11
finalValue = round(GetGrayscale(r, g, b), 3)
if(finalValue >= targetValue - treshold and finalValue <= targetValue + treshold):
print(f"r: {round(r, 2)}")
print(f"g: {round(g, 2)}")
print(f"b: {round(b, 2)}")
print(f"Final Value: {round(finalValue, 3)} in {attempts} attempts")
else:
GetB()
GetB()I think these features could be great to make color paintings easier
Thanks!