Easy Pattern (Koolook)

Easy Pattern generates a batch of solid-color test images, each stamped with a per-frame number. That's it. It's a test card generator for people who are tired of squinting at identical black frames trying to figure out whether their sequence got shuffled.

The use case is debugging pipeline order. When you're wiring up a video workflow - a batch merge, a frame-insert node, a saver that numbers files - the fastest way to prove it works is to feed it frames that tell you exactly where they are. One frame says 007, the next says 008, and if your saver writes them out of order or your merge drops one, it's immediately visible. The pack frames it as "anywhere a more flexible alternative to KJNodes' ImageBatchTestPattern is needed," which is accurate.

The settings that matter

The defaults are sane, so a beginner mostly touches a few things:

• batch_size - how many frames to generate (default 81, matching the video shot length this pack defaults to everywhere).
• start_from and step - what the first frame says and how the counter advances. Step goes negative too, if you want to test backwards.
• show_text - on by default. Turn it off and you get plain solid frames.
• zero_pad - minimum digit count, so 7 becomes 007 at pad 3. This is the one that makes filenames sort correctly downstream.
• position, font_size, bg_color_mode / text_color_mode - cosmetic, but the color presets include a Custom option that reads bg_color / text_color as #RRGGBB, RRGGBB, or shorthand #RGB (the default background is a magenta-ish #C71585, because test cards should never be mistaken for real content).
• prefix / suffix - text before and after the number, if you want A_001_B.

Output is a single images batch you can feed to anything that takes IMAGE. If you need the numbers as actual metadata rather than pixels, you're looking at the wrong node - but for order-checking, pixels are exactly what you want.

Install

It ships in ComfyUI-Koolook. ComfyUI Manager → Install Custom Nodes → Git URL:

https://github.com/malkuthro/ComfyUI-Koolook.git

Or:

cd ComfyUI/custom_nodes
git clone https://github.com/malkuthro/ComfyUI-Koolook.git

Restart and it appears under Koolook/Testing. No models, no extra dependencies. It uses Pillow for the text drawing, which ComfyUI already has. And yes, the pack-wide rule still applies: install once, via one method. A second install (Manager at custom_nodes/koolook/ plus a clone at custom_nodes/ComfyUI-Koolook/) loads both on every boot and the plugin's workflow store starts corrupting until you delete one.

Common issues

• Text clipped - font_size is bigger than the image width; the tooltip calls it out. Drop the font size or widen the frame.
• Frames out of order downstream - check zero_pad. Without it, 9 sorts after 10 in most file managers. Pad to the same width as your shot length.
• You expected a grid or gradient - this is solid-color only. It's a sequence test card, not a camera test chart. For that you want an actual test-pattern node.