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While there are many operators that do just what you need in TouchDesigner, there are times when you need to create your own effects. A simple example here is the fast bloom-style filter.
A fast approximation of bloom is made of a few core elements. First we need to isolate the brightest elements in our image. We can do this with the Threshold TOP. to remove low-luminance parts of our image, we can use a Composite TOP set to Multiply and combine our thresholded texture with the original texture.
Our next step is to blur the brightest elements in our texture, and then add that result to our original texture. We can use a Blur TOP to soften our image and a Composite TOP set to Add to complete our filter. Voila – a simple bloom filter.