ComfyUI/comfy_extras/nodes_resolution.py
Christian Byrne 1f1ec377ce
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feat: add ResolutionSelector node for aspect ratio and megapixel-based resolution calculation (#12199)
Amp-Thread-ID: https://ampcode.com/threads/T-019c179e-cd8c-768f-ae66-207c7a53c01d

Co-authored-by: Jedrzej Kosinski <kosinkadink1@gmail.com>
2026-02-27 09:13:57 -08:00

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from __future__ import annotations
import math
from enum import Enum
from typing_extensions import override
from comfy_api.latest import ComfyExtension, io
class AspectRatio(str, Enum):
SQUARE = "1:1 (Square)"
PHOTO_H = "3:2 (Photo)"
STANDARD_H = "4:3 (Standard)"
WIDESCREEN_H = "16:9 (Widescreen)"
ULTRAWIDE_H = "21:9 (Ultrawide)"
PHOTO_V = "2:3 (Portrait Photo)"
STANDARD_V = "3:4 (Portrait Standard)"
WIDESCREEN_V = "9:16 (Portrait Widescreen)"
ASPECT_RATIOS: dict[str, tuple[int, int]] = {
"1:1 (Square)": (1, 1),
"3:2 (Photo)": (3, 2),
"4:3 (Standard)": (4, 3),
"16:9 (Widescreen)": (16, 9),
"21:9 (Ultrawide)": (21, 9),
"2:3 (Portrait Photo)": (2, 3),
"3:4 (Portrait Standard)": (3, 4),
"9:16 (Portrait Widescreen)": (9, 16),
}
class ResolutionSelector(io.ComfyNode):
"""Calculate width and height from aspect ratio and megapixel target."""
@classmethod
def define_schema(cls):
return io.Schema(
node_id="ResolutionSelector",
display_name="Resolution Selector",
category="utils",
description="Calculate width and height from aspect ratio and megapixel target. Useful for setting up Empty Latent Image dimensions.",
inputs=[
io.Combo.Input(
"aspect_ratio",
options=AspectRatio,
default=AspectRatio.SQUARE,
tooltip="The aspect ratio for the output dimensions.",
),
io.Float.Input(
"megapixels",
default=1.0,
min=0.1,
max=16.0,
step=0.1,
tooltip="Target total megapixels. 1.0 MP ≈ 1024×1024 for square.",
),
],
outputs=[
io.Int.Output("width", tooltip="Calculated width in pixels (multiple of 8)."),
io.Int.Output("height", tooltip="Calculated height in pixels (multiple of 8)."),
],
)
@classmethod
def execute(cls, aspect_ratio: str, megapixels: float) -> io.NodeOutput:
w_ratio, h_ratio = ASPECT_RATIOS[aspect_ratio]
total_pixels = megapixels * 1024 * 1024
scale = math.sqrt(total_pixels / (w_ratio * h_ratio))
width = round(w_ratio * scale / 8) * 8
height = round(h_ratio * scale / 8) * 8
return io.NodeOutput(width, height)
class ResolutionExtension(ComfyExtension):
@override
async def get_node_list(self) -> list[type[io.ComfyNode]]:
return [
ResolutionSelector,
]
async def comfy_entrypoint() -> ResolutionExtension:
return ResolutionExtension()