Can someone tell me why jit.op multiply won't multiply above 1?

Also, jit.op divide won't divide below 1. Why the limitation on this?

Hi,
Can someone tell me why jit.op multiply won't multiply above 1?
Is there an operation that will?
Also, jit.op divide won't divide below 1. Why the limitation on this?
Maybe I'm missing something obvious.
Cheers,
baz


jit-op-multiply-above-1

umm.. do you mean that [jit.op @op * 2.] dosent mult by two the incoming matrix? cant be possible...

jitter-examplesrenderslab-helpersmath.shaders-help.maxpat

It depends on the type of your matrix. If you are using 

 matrices, the floating point value is interpreted as a ratio where 0. correspond to 0 (in char), and 1. correspond to 255, in other word, the value is converted to the datatype that you're using first. The patch bellow might clarify a bit.

It depends on the type of your matrix. If you are using char matrices, the floating point value is interpreted as a ratio where 0. correspond to 0 (in char), and 1. correspond to 255, in other word, the value is converted to the datatype that you're using first. The patch bellow might clarify a bit.


Sorry, an example is worth a thousand words. What I am trying to do is demonstrate depth of color information. As you can see in my example, the divide op works like you'd expect, and the multiply doesn't do anything. Emmanuel's answer may be useful.

char integer 0-255 is considered floating point 0. to 1.

Due to the way jit.op works internally, when setting a val it currently can *only* be in the range supported by the char format, as the val is made into a matrix of the *same type* as the incoming matrix. You'll either need to use long or float types if you want to do what you describe. Or use objects like jit.scalebias which let you set any multiplicand.

Please go back to the jitter tutorials or search the forum archives for more info. This question has been discussed many times.

char integer 0-255 is considered floating point 0. to 1. 

Please go back to the jitter tutorials or search the forum archives for more info. This question has been discussed many times.


jit.op multiply above 1