↔️ AGSoft Image Compare

Comparing two images in ComfyUI usually means two preview windows and a lot of eye-crossing. ↔️ AGSoft Image Compare is a preview node built for the actual job: it overlays both images in one view with a draggable slider, shows pixel differences, or splits them side by side - and it lets you zoom and pan into the details instead of trusting your monitor at 100%. If you've ever tried to tell whether an upscale actually added detail by flicking between windows, this is the upgrade.

It's an output/preview node: it displays, it doesn't transform. And it passes both images through untouched, so you can drop it inline without disturbing the rest of the graph.

The three modes

• Slider (default) - one image revealed over the other behind a draggable divider. The classic before/after interaction, and the one you'll live in when comparing an upscale against its source.
• Difference - shows exactly where the two images differ (black = identical). This is the mode that settles arguments: if a "2x upscale" is really just a resize, the difference view tells you instantly whether anything changed besides size.
• Side-by-Side - a vertical split.

The controls that make it usable

zoom (0.1–10, default 1.0) magnifies both images, and pan_x/pan_y (default 0) scroll the view - the pair that lets you inspect a single eye or a patch of texture at full zoom instead of eyeballing thumbnails. And there's a nice production detail in the node description: hover the node and press Space to temporarily hide the second image, so you can compare at the pixel level without the overlay interfering.

Both image_1 and image_2 are optional inputs, and the node passes image_1 and image_2 right back out as outputs - so it can sit anywhere in a graph as a live inspection point without breaking the flow.

Where you'd use it

Everywhere you'd otherwise screenshot a comparison: upscale quality checks (the community's standing advice - decide whether you need more pixels or more detail before comparing, then use this to see it), inpaint seam checks, LoRA strength head-to-heads, before/after of a denoise sweep. Wire two branches of the same graph into it and you get a live A/B view that updates on every queue.

Installing it

Pack standard: ComfyUI Manager → search comfyui-AGSoft → install, restart. Or:

cd ComfyUI/custom_nodes
git clone https://github.com/Art-xmaster/comfyui-AGSoft.git

No models, no dependencies beyond ComfyUI's preview infrastructure - it subclasses the built-in PreviewImage node and adds the comparison widgets.

Common issues

The usual suspects: two images of different sizes will compare oddly, so resize one side to match first (the pack's Image & Mask Resize is handy for that). In Difference mode, images must line up pixel-for-pixel to mean anything - a slightly different crop makes the whole frame light up and tells you nothing. And if the zoom/pan feel laggy, it's the preview pipeline, not the node - keep zoom at 1.0 unless you're inspecting a specific detail.