◐ Image Contrast Adjustment

One float, one image out, zero mystery. Image Contrast Adjustment [Dream] is the simplest way to change a frame's contrast mid-workflow, and because it takes a factor input you can wire that number to a curve and animate the contrast frame by frame. In a Deforum-style render that's the difference between a static look and one that breathes.

This is one of the color nodes from the Dream Project Animation Nodes pack, a 2023-era suite built by qaozmojo (the "Alt Key Project" music channel) for frame-by-frame animation in ComfyUI. It's no longer actively maintained - the README points you to the author's newer pack, comfyui-dream-video-batches - but the utility nodes still do exactly what they say and have no heavy dependencies.

What it does

Under the hood it's a single Pillow call: ImageEnhance.Contrast(...).enhance(factor). A factor of 1.0 leaves the image untouched, anything above 1.0 pushes contrast up, and below 1.0 flattens it - 0.0 gives you a uniform gray. There's no minimum beyond 0 and no clamp on top, so you can push it hard if you want that crunchy look.

The factor input is a FLOAT, so the fun part is that you can drive it from a curve node - Sine Curve, CSV Curve, whatever you have handy - and your contrast now ebbs and flows with the animation instead of being glued to one setting.

The inputs that matter

• image (IMAGE) - whatever frame you're processing.
• factor (FLOAT) - 1.0 is neutral, above for punchier, below for flatter.

Output is a single image, so it drops into the same spot in the chain it came from.

When you'd actually use it

Two situations stand out. First, the pack's own prompt-morphing example uses brightness and contrast control as part of the visual pacing - fading a shot's punch in and out while the prompt drifts. Second, the classic frame-to-frame drift problem: long animations gradually get washed out or murky, and a touch of contrast correction on a reference pass fixes the feel without re-rendering.

Installing it

It ships inside the Dream Project Animation Nodes pack, so install the pack once and you get all the Dream nodes:

cd ComfyUI/custom_nodes
git clone https://github.com/alt-key-project/comfyui-dream-project.git

Or use ComfyUI Manager and search "Dream Project Animation". Then restart ComfyUI. Dependencies are imageio, pilgram, scipy, torchvision, and evalidate - nothing model-sized, no downloads. One real gotcha: the pack pins numpy<2.0, which can collide with newer packs that assume NumPy 2. If you see a NumPy error after installing, that's the usual suspect.

You'll find it under the Dream → image → color menu. And if you want to also drop brightness, the sibling "Image Brightness Adjustment" node works identically and composes cleanly in series.