Once again I have delved into simulating video feedback.

Here is a 4K resolution 60 fps movie with some samples of what the new simulations can do.

This third attempt is fairly close to second version but with a few changes I will explain here.

The main change is being able to order the effects. This was the idea that got me programming version 3. A shuffle button is also provided that randomly orders the effects. Allowing the effect order to be customised gives a lot of new results compared to the first 2 video feedback simulation modes.

Since the above screenshot, the settings have continued to grow.

Here are some explanations for the various effects.

__HSL Flow__

Takes a pixel’s RGB values, converts them into HSL values and then uses the HSL values in formulas to select a new pixel color. For example if the pixel is red RGB(255,0,0), then this converts to HSL(0,1,0.5) assuming all HSL values range from 0 to 1. The length formula above is H*360 and the length formula is s*5. So in this case the new pixel value read would be 5 pixels away at the angle 0 degrees. Changing these formulas allows the image to “flow” depending on the colors.

__Sharpen__

Sharpens the image by blurring the image twice using different algorithms (in my case I use a QuickBlur (Box Blur) and a weighted convolution kernel). The second blur value is subtracted from the first and then using the following formula the target pixel value is found. newr=trunc(r1+amount*(r1-r2))

__Blur__

Uses a standard gaussian blur.

__Blend__

Combines the last “frame” and the current frame. Various blend options change how the layers are combined.

__Contrast__

Standard image contrast setting. Can also be set for negative contrasts. Uses the following formula for each of the RGB values r=r+trunc((r-128)*amount/100)

__Brightness__

Standard brightness. Increases or decreases the pixel color RGB values.

__Noise__

Adds a random value to each pixel. Adding a bit of noise can help stop a simulation dying out to a single color.

__Rotate__

Guess what this does?

__Histogram__

Uses a histogram of the image to auto-brightness. Can help the image from getting too dark or too light.

__Stretch__

Zooms the image. Various options determine the algorithm used to zoom the image.

__Image Processing__

Allows the various image processing functions in Visions of Chaos to be injected into the mix for even more variety.

__Less Is Sometimes More__

Another feature I added recently was to randomly remove some of the effects in the “order of effects” list. This means there is less processing done each frame, but having only 3 or more effects has given many new unique output patterns and results. So rather than throw every possible image processing step you can think of at it, pick a smaller subset of them.

__The End – For Now__

As always, you can experiment with the new VF3 mode in the latest version of Visions of Chaos.

I would be interested in seeing any unique results you come up with.

For the next version 4 simulation I would like to chain various GLSL shaders together that make the blends, blurs etc. That will allow the user to fully customise the simulation and insert new effects that I did not even consider. Also GLSL for speed. Rendering the above movie frames took days at 4K resolution.

Jason.