Flex Image Chromatic Aberration ⚡🅡🅞🅣🅘

Chromatic aberration is the color fringing you get from cheap lenses (or deliberately, in a lot of glitch/VHS/lo-fi looks) - red, green, and blue not quite lining up at the edges of high-contrast areas. FlexImageChromaticAberration is a small, focused node that does exactly that split, and - because it's a Flex node - can be driven by a reactive Feature so the fringing pulses with audio, motion, or anything else you've extracted elsewhere in RyanOnTheInside's system.

How it works

It's genuinely just two parameters: shift_amount (0–0.5, default 0.01) controls how far apart the RGB channels get pushed - small values are subtle, "vintage lens" fringing; larger values start to look like a deliberate glitch effect. angle (0–720°, default 0) sets the direction of the split - 0° is horizontal, 90° is vertical, and because the range goes past 360° you can feed it a continuously increasing value from a Feature for a slowly rotating aberration direction rather than a fixed one.

Both parameters can be feature-modulated: feature_param picks which one (shift_amount, angle, or None to turn modulation off entirely), feature_mode decides whether the feature nudges the base value (relative) or replaces it outright (absolute), feature_threshold sets the minimum feature value before modulation kicks in at all, and the top-level strength scales how much influence the feature has once it's active.

Inputs and outputs that matter

• images - required, the sequence to process.
• shift_amount - the one setting that matters most; start small (0.005–0.02) and increase until the effect reads as intentional rather than like a display glitch.
• angle - worth animating via a feature if you want the fringe direction to drift rather than sit static.
• opt_feature (optional) - connect any Feature node here to drive shift_amount or angle over time.

Output is a single IMAGE.

How to install it

Via ComfyUI Manager, search "RyanOnTheInside." Manually:

cd ComfyUI/custom_nodes
git clone https://github.com/ryanontheinside/ComfyUI_RyanOnTheInside
cd ComfyUI_RyanOnTheInside
pip install -r requirements.txt

then restart. This is a lightweight pixel-shift effect - no model weights, no heavy dependency specific to this node.

Common issues & troubleshooting

Effect is barely visible. shift_amount's useful range tops out at 0.5 but most convincing-looking fringing lives well under 0.05 - if you're expecting a bold effect and cranking shift_amount toward its max, you'll get something that looks broken rather than stylized. For a strong, obvious split, pair a moderate shift_amount with high-contrast source footage; the effect is much more visible against sharp edges than soft gradients.

Fringing looks the same on every frame even with a feature connected. Check feature_param is actually set to shift_amount or angle and not left on None - the default disables modulation, so a connected opt_feature does nothing unless feature_param explicitly names a target.

Direction seems to snap instead of rotate smoothly. If you're driving angle from a feature, make sure the feature's own value range and your feature_mode (relative vs absolute) actually produce a smooth ramp - a feature that jumps between discrete states (like a thresholded on/off signal) will make the angle snap rather than sweep, regardless of this node's own settings.