[pix_coloralpha]

Reply to [pix_coloralpha] on Mon, 25 Apr 2016 22:41:59 GMT

lovelovevideo — Mon, 25 Apr 2016 22:41:59 GMT

I really like the [pix_coloralpha] object......the problem for is that it seems to be just a toggle on/off affair...

I tried substituting the number box for the toggle with the same result...0-1/-1 results in merely switching the effect on or off...

What I would like is to adjust the effect gradually..

Any thoughts?

Reply to [pix_coloralpha] on Tue, 26 Apr 2016 08:25:16 GMT

whale-av — Tue, 26 Apr 2016 08:25:16 GMT

@lovelovevideo [pix_coloralpha sets the alpha channel to the mean rgb for every pixel.....
Maybe [pix_alpha] will be more useful as threshold can be set for color levels.......
David.

Reply to [pix_coloralpha] on Wed, 27 Apr 2016 22:30:23 GMT

lovelovevideo — Wed, 27 Apr 2016 22:30:23 GMT

@whale-av thxx, what I wanted was to adjust the intensity of the effect in real time...

However, [pix_alpha] has proven very useful as I was also looking for a transparency effect........I am thinking a combination of [metro] and different messages may get me closer?

Reply to [pix_coloralpha] on Tue, 24 May 2016 07:34:05 GMT

cwp — Tue, 24 May 2016 07:34:05 GMT

@lovelovevideo Essentially you want to use your alpha channel to control opacity to create a sort of fading effect? And you're trying to convert whatever value is feeding into the alpha channel from an integer into a float--a decimal value between 0 and 1?

Reply to [pix_coloralpha] on Tue, 24 May 2016 08:27:47 GMT

cwp — Tue, 24 May 2016 08:27:47 GMT

@lovelovevideo ok, so maybe this is way basic and obvious, but... i've had a similar problem and decided to use [colorRGB] to manipulate "opacity":

Below is just an example. Essentially you want to choose an integer range between 0 and whatever positive integer (the alpha inlet of [colorRGB] uses values between 0 and positive 1). Your input has to be within this range (e.g. 25, 10, 5, etc.). Then divide the input by the range (50) and thus you will yield a float (decimal value) between 0 and 1. The resultant float (decimal) values will be "spaced" out in the same increments as your integer range (i.e. input 5/50 = .1, 10/50 = .2, 15/50 = .3, etc).

I hope this helps and isn't more confusing or besides the point!

Reply to [pix_coloralpha] on Wed, 25 May 2016 21:31:34 GMT

lovelovevideo — Wed, 25 May 2016 21:31:34 GMT

@cwp thanks so much for your response! ok...i'll try it out!

I have been looking for different ways too adjust the intensity of colors(in images) in real time....[contrast] also works, however, it seems to be a bit slow when combined with lots of other objects/effects etc...

EDIT: I think a lot of the magic in this area is going to be with GLSL shaders etc.....an underexposed topic around here, however, some diligent searching can yield some fruit:P