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Back to Graphics and GPU Programming

how do you apply a brush colour to an image professionally in an art program

Started by
3 comments, last by Bacterius 10 years, 10 months ago

Simply averaging the colour on due to opacity is not how its done, I know this because im getting a different result.

Does anyone know how to do this professionally? or know where I could try and find out?

Ive looked up blend modes, but its not really what I need, cause I just want to know how NORMAL BLEND MODE works!

And this is never explained.

So its a method of opacity, I looked up opacity and they just blurted out the exact way im doing it, but its not the right way...

http://prosjekt.ffi.no/unik-4660/lectures04/chapters/Basic.html#tag1

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ah success. youve got to find the difference first! then subtract it, but there might be more to it than that just yet, but im definitely closer...

do you get what i mean? you multiply opacity by the difference!!! its not all in one line.

You, uh, linearly interpolate between the two colors using the specified alpha? 
layer1 + alpha * (layer2 - layer1)

EDIT: And, as you've probably seen in the FFP,
(layer1 * alpha) + (layer2 * (1-alpha))
clb: At the end of 2012, the positions of jupiter, saturn, mercury, and deimos are aligned so as to cause a denormalized flush-to-zero bug when computing earth's gravitational force, slinging it to the sun.

yeh, those 2 different operations are completely different, they give completely different results. yes i know now.

Yeah, it's actually the opposite. Just for completeness, it should be


(layer2 * alpha) + (layer1 * (1 - alpha))

“If I understand the standard right it is legal and safe to do this but the resulting value could be anything.”

This topic is closed to new replies.

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