🟦 CR Checker Pattern

Sometimes you just need a checkerboard. A transparency-style backdrop, a test pattern to check tiling or alignment, a base to run a ControlNet or img2img pass over, a graphic element for a layout. This node draws one to whatever size and colors you want, no image editor round-trip.

It's one of the pattern generators in Comfyroll Studio (Suzie1 / RockOfFire) - a section full of these procedural-image nodes: color bars, gradients, starbursts, halftone grids. They're all cut from the same cloth: pick dimensions and colors, get an image out.

How it works

Straight procedural drawing with Pillow. You give it a canvas size and two colors, it tiles a grid of alternating squares across it. No model, no randomness, no generation - same inputs give you the same board every time, and it renders instantly.

The inputs that matter

• width / height - the output size in pixels (up to 4096). Match this to whatever you're feeding it into.
• color_1 / color_2 - the two square colors. 30 named presets each, plus custom. Same rule as the rest of Comfyroll's graphics nodes: choosing custom pulls the color from the matching hex box (color1_hex / color2_hex), which default to black - so set the hex or you'll get two black squares, i.e. a solid black image.
• grid_frequency (default 8) - how many squares across. This is the density dial: low numbers give you big chunky tiles, high numbers a fine grid.
• mode - regular for a standard even checkerboard, or stepped, which uses the step value to vary the pattern into a more staggered/graduated look. Leave it on regular unless you specifically want the stepped variant.

Output is IMAGE, plus the show_help wiki link you can leave dangling.

How to install it

• ComfyUI Manager: search Comfyroll Studio, install, restart.
• Manual: cd ComfyUI/custom_nodes && git clone https://github.com/Suzie1/ComfyUI_Comfyroll_CustomNodes.git, then restart.

No downloads. It's a Pillow-based node, and Pillow ships with ComfyUI.

Common issues

The one real gotcha isn't in the settings - it's the pack failing to register. If the pattern nodes are missing and the log shows Comfyroll Studio: Failed to load Graphics nodes, that's a broken Pillow install (common on fresh Python 3.12 setups), not a bug in this node. Reinstall Pillow to match your Python and reinstall the pack.

The other "problem" is self-inflicted: a solid-color output almost always means you left one or both colors on custom without filling the hex field. And if the board looks like a blurry gray haze at a distance, grid_frequency is cranked so high the squares are sub-pixel - dial it back down until the tiles are the size you actually want.