Flip

There's no trick here, and that's the point: Flip mirrors an image along one axis. Nothing about generation changes, nothing gets regenerated - it's a pure pixel transform, the kind of thing you reach for constantly and never think about until the one time you need it and there's no built-in node that does exactly this.

You'll reach for it in a handful of specific spots: correcting a reference image that's mirrored relative to what you want (a photo shot with the subject facing the "wrong" way for your composition), building quick left/right augmented pairs for a LoRA dataset, or flipping the output of a workflow whose result came out backwards because an upstream ControlNet/IPAdapter reference was itself flipped. It's small, but it's the kind of node that saves you a trip to an external image editor for a five-second fix.

The inputs and outputs that matter

There are exactly two things to set:

• image - what you're flipping.
• axis - horizontal or vertical. Horizontal is the common one: it mirrors left-to-right, like looking in a mirror. Vertical flips top-to-bottom, which is rarer but useful for correcting an upside-down scan or a deliberately inverted-reflection effect.

One output, image, wired straight into whatever's next - a Save node, a ControlNet preprocessor, another HakuImg node in a post-processing chain.

How to install it

Search ComfyUI-HakuImg in ComfyUI Manager, or:

cd ComfyUI/custom_nodes
git clone --recurse-submodules https://github.com/licyk/ComfyUI-HakuImg

Restart ComfyUI. Flip lives under Image → HakuImg along with the rest of the pack's nodes. It has no dependencies of its own - this is one of the nodes in the pack that doesn't touch the --recurse-submodules part at all, so if it's the only node you need from this pack, a plain clone will do, though the recursive flag doesn't hurt anything either.

Common issues & troubleshooting

There isn't much to trip over here - it's a one-line operation - but two things catch people out:

Flip isn't the same as rotate. A horizontal flip mirrors the image; it doesn't turn it 90 or 180 degrees. If your image came out sideways rather than backwards, you want a rotate node, not this one.

Text and watermarks come out backwards. Obvious once you think about it, easy to forget mid-workflow: flipping an image with any text, logos, or asymmetric details in it (a wristwatch on the wrong wrist, a car's steering wheel on the wrong side) will mirror those too. Fine for most compositional fixes, worth double-checking if the source has anything legible in it.