NicZwart

Hey all, I'm trying to figure out a simple way to do blend modes with two videos in Jitter. Specifically, I want to make a patch that does something as close to the 'color blend' mode in Adobe Photoshop or other photo editing software as possible. I've been trying to find out what's going on mathematically when a photo editor does this, and I found this entry on wikipedia:

"The Color blend mode preserves the luma of the bottom layer, while adopting the hue and chroma of the top layer" (

http://en.wikipedia.org/wiki/Blend_modes#Hue.2C_saturation_and_luminosity)

I'm still new to Jitter and video, and still learning the terminology, but what is the difference between luma and the alpha channel? Also, what is 'chroma'? Is that simply the level of the three color channels?

Hey all, I'm trying to figure out a simple way to do blend modes with two videos in Jitter.  Specifically, I want to make a patch that does something as close to the 'color blend' mode in Adobe Photoshop or other photo editing software as possible.  I've been trying to find out what's going on mathematically when a photo editor does this, and I found this entry on wikipedia: 

"The Color blend mode preserves the luma of the bottom layer, while adopting the hue and chroma of the top layer" (http://en.wikipedia.org/wiki/Blend_modes#Hue.2C_saturation_and_luminosity)

I'm still new to Jitter and video, and still learning the terminology, but what is the difference between luma and the alpha channel?  Also, what is 'chroma'?  Is that simply the level of the three color channels?

color-blend-mode

I'm thinking jit.op and tutorials five to ten. These will explain everything you want to know.

https://cycling74.com/docs/max5/tutorials/jit-tut/jitindex.html

and this explains what goes on mathematically when colorblending

https://cycling74.com/docs/max5/refpages/jit-ref/jit.op.html

Work your way through these and you should be all right,

(If you open the tutorials from max you can acces the tutorial-patches)

Work your way through these and you should be all right,
Good luck!
FRid

(If you open the tutorials from max you can acces the tutorial-patches)


if you want to do this with shaders, you'd have to find or create an rgb to hsl shader.

if you want to do this with shaders, you'd have to find or create an rgb to hsl shader.
otherwise, use the matrix objects:


Replicas of the Adobe blending modes are built into all of the Auvi objects:

Replicas of the Adobe blending modes are built into all of the Auvi objects:
http://auvi-software.com

Kurt
...
Visiting Faculty and Artist-in-Residence
MFA Digital Media
Rhode Island School of Design
http://retnull.com


Color Blend mode