Andy Fennesz

I'd like to apply, say, Slider to the dark parts and Fogger to the highlights, maybe. I imagine there's some way to get at the luminance values of pixels and just use inequalities, like 0 < shadows < 44, but I've only used Vizzie objects and have never gotten "inside" of the video streams to the nitty gritty of what's going on.

I'd like to apply, say, Slider to the dark parts and Fogger to the highlights, maybe.  I imagine there's some way to get at the luminance values of pixels and just use inequalities, like 0 < shadows < 44, but I've only used Vizzie objects and have never gotten "inside" of the video streams to the nitty gritty of what's going on.  

I'd like to apply, say, Slider to the dark parts and Fogger to the highlights, maybe.  I imagine there's some way to get at the luminance va

how-do-i-split-a-video-into-its-darks-midtones-and-highlights

you can use luminance, but you can also just use brightness and check if the average of R, G and B together is below or above 1.0 (or 255) to find the darker third.

to split a video matrix you needed to make a copy of it anyway, so i would do that first, then perform a "shadow only" and a "shadows removed" process to them.

you would typically use an alpha channel for that where you make a mask of black and white. if you already have four channels, you just add a fifth for the mask.

better results for seperate processing will be possible when you allow transitions between the brightness parts, but go on and do the > version first.


you can use luminance, but you can also just use brightness and check if the average of R, G and B together is below or above 1.0 (or 255) to find the darker third.

to split a video matrix you needed to make a copy of it anyway, so i would do that first, then perform a "shadow only" and a "shadows removed" process to them.

you would typically use an alpha channel for that where you make a mask of black and white. if you already have four channels, you just add a fifth for the mask.

better results for seperate processing will be possible when you allow transitions between the brightness parts, but go on and do the > version first.


you can get pretty close simply using Vizzie objects:

Thank you both. Roman, where/how do I actually perform the inequalities? I'm trying with jit.op <p and the results are barely ok. Thanks.

Thank you both.  Roman, where/how do I actually perform the inequalities? I'm trying with jit.op  <p and the results are barely ok.  Thanks.

jit.op is where i would start with experiments, but i dont think you can avarage values of multiple planes inside it.

so you should first convert / mix RGB to 1 plane (a black and white channel) and measure the brightness of that. 

> or >p should then do what you want it to do: give you the lights only, with the removed pixels black.

if you then take the output maxtrix, convert it to 2-bit (=make all "passed" pixels white) and invert the resulting image, then this is the mask which converts the input matrix to mid and low. now repeat to split mid and low.

leave that black and white matrix type char all the time, then you can later use some minimal blurring for a pseudo antialiasing effect on the masks wihtout changing the arguments.


jit.op is where i would start with experiments, but i dont think you can avarage values of multiple planes inside it.

so you should first convert / mix RGB to 1 plane (a black and white channel) and measure the brightness of that. 

> or >p should then do what you want it to do: give you the lights only, with the removed pixels black.

if you then take the output maxtrix, convert it to 2-bit (=make all "passed" pixels white) and invert the resulting image, then this is the mask which converts the input matrix to mid and low. now repeat to split mid and low.

leave that black and white matrix type char all the time, then you can later use some minimal blurring for a pseudo antialiasing effect on the masks wihtout changing  the arguments.

have enough coffee around.


How do I split a video into its darks, midtones, and highlights?