PS effect understanding record 2 color_ dodge color_ burn

oh , Default alpha=1
color_dodge The color fades
BB = base color of background
B = blend color
BB+( BB * B ) / (1-B)
The formula is like this , First look at molecules ,BB unchanged ,B It's a mixed color ,B If it is 0, The result is completely BB,B If the bigger , The smaller the denominator ,B The closer the 1, The smaller the denominator , The larger the value you get , The result of that BB+ A number , Getting closer to white , There will be a visual effect of color fading .BB The impact is BB If you are close to 0, Will inhibit B The effect is , for example
BB=0.001, The result color is BB +（0.001 * B) / (1-B) contrast BB=0.5 Result BB +（0.5 * B) / (1-B), Naturally, it is 0.5 This is easier to fade .

color_burn The color deepened
BB - (1 - BB) * (1 - B)/B
This formula. , casual BB What color is it , If it's white , You don't have to forget , If not ,1-BB Get a value , This value does not change , And then there was B,B The bigger it is , The larger the denominator , Molecular 1 - B The smaller the part , The result is a very small value , If B Very small ,1-B Is very big , The denominator is small , Molecular macromolecules , Get a huge value , then BB Subtract him , The color will be reversed 0, How much you pour depends on the size , But it must be to 0 Inverted , So it looks darker .BB The effect is if BB near 1, that （1-BB） The result is a very small value , Will suppress the rear B Result ,B Effects that require less to be visible to the naked eye .