Post-Process Suite (CRT)

Every finished image needs some final pass - a touch of contrast, a sharpen, a vignette, a bit of grain to kill the plastic look - and doing that in ComfyUI usually means chaining four or five single-purpose FX nodes. Post-Process Suite (CRT) is the all-in-one alternative: one node with an enormous optional panel of effects, each gated behind its own enable switch, so you get the whole color-grading workbench without a wall of nodes. It's the CRT pack's flagship FX node for a reason.

How it's structured

The only required input is image. Everything else is optional and disabled by default - which is the design that makes a 60-field node usable. You flip on the sections you want and tune those; the off sections cost nothing. The sections:

• Upscale - an optional spandrel-based model upscale (upscale_model_path picks from your upscale_models folder), with downscale_by, rescale_method, and precision (auto/32/16/bfloat16) to keep it sane.
• Levels - exposure, gamma, brightness, contrast, saturation, vibrance. The classic global color/tonal trio.
• Color wheels - per-channel lift / gamma / gain (nine floats, the RGB shadow/mid/highlight split).
• Temp & tint - white-balance adjustment, −100 to 100.
• Sharpen - sharpen_strength, radius, threshold. The threshold is the important one: it keeps the sharpen off flat areas so you don't amplify noise.
• Small glow / Large glow - the modern "bloom but soft" look; small glow is fine halation, large glow is the cinematic haze.
• Glare - anamorphic-style lens flares (star_4, star_6, star_8, anamorphic_h) with angle, length, and quality controls.
• Chromatic aberration - edge color fringing with ca_strength and falloff, plus an optional hue-shift mode.
• Vignette - strength, radius, softness.
• Radial blur - spin or zoom blur around a center point.
• Film grain - intensity, size, and color_amount for that analog finish.
• Lens distortion - barrel_distortion for warping.

Output is the graded IMAGE.

The honest take

The killer combination for photorealism is Levels (or the wheels) + Sharpen + Grain: contrast, a thresholded sharpen, and grain to hide the digital smoothness - that's most of the way to a filmic look in one node. The glares and aberration are fun and very much optional. Where people get burned is turning on everything and getting a fried image; the enable switches are there so you don't.

Gotchas

• The upscale section needs a model. upscale_model_path defaults to None; until you point it at a real model in models/upscale_models/, the enable switch does nothing but confuse.
• batch_size caps memory for the upscale path - leave it low unless you have headroom.
• It's order-fixed. Effects run in the suite's internal order; you can't reorder sections. For a custom order, use the individual CRT FX nodes instead.

Install CRT-Nodes via ComfyUI Manager (CRT-Nodes) or git clone https://github.com/plugcrypt/CRT-Nodes.git into custom_nodes, install requirements.txt, restart. The spandrel and opencv-contrib-python deps in that file are what power the upscale and FX paths.