# Scale Factors & Offset Values effect on Blend Modes

• Question
• Updated 5 years ago
I'm wondering what exactly the Add & Subtract Functions calculate..

I know that whatever the result is, its divided by the Scale Factor, then added to the Offset Value

But I would like to know what sort of Integer the result of the equation is prior to dividing by the Scale Factor.. is it a large number? how many digits? does it have decimal places? if so, how many?

and the scale factor is 1.000 to 2.000, which is basically just 1 to 2, but it has 3 Decimal Places.. does .001 actually have any effect? and what does the scale factor mean exactly, and what does it do?

And then, also, the Offset values can be anywhere from -255 to 255.

if 128 is Neutral Gray, halfway between 0 & 255, what is -128? also, I dont see much difference in the images with values below 0

And why is it called "Offset"? and is 128 a state of not being offset at all?

and what role does the Scale Factor play on Blending Modes such as Linear Light, etc?

any info would be appreciated
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