ComfyUI Extension: ComfyUI-ImageAutotone

Authored by SparknightLLC

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Updated

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A node for ComfyUI that takes an input image and clips the color channels independently to increase contrast and alter color cast. This is a reinterpretation of PhotoShop's 'Auto Tone' algorithm.

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    README

    ComfyUI-ImageAutotone

    A node for ComfyUI that takes an input image and clips the color channels independently to increase contrast and alter color cast. This is a reinterpretation of PhotoShop's "Auto Tone" algorithm.

    Special thank you to Gerald Bakker for his writeup on Adobe's various algorithms:

    • https://geraldbakker.nl/psnumbers/auto-options.html

    workflow_image_autotone

    Installation

    Simply drag the image above into ComfyUI and use ComfyUI Manager » Install Missing Custom Nodes.

    Inputs

    • image: The input image(s) to process with the autotone algorithm
    • shadows: The color that defines the shadows of the image. This should be a comma-separated RGB value (e.g., '0,0,0' for black) or HEX string (e.g. '#000000').
    • highlights: The color that defines the highlights in the image. This should be a comma-separated RGB value (e.g., '255,255,255' for white) or HEX string (e.g. '#FFFFFF').
    • shadow_clip: The percentage of pixels to clip from the shadows. This is a value between 0 and 1.
    • highlight_clip: The percentage of pixels to clip from the highlights. This is a value between 0 and 1.

    Bonus Comparison

    Below is a workflow that demonstrates the difference between Image Autotone and a few other image contrast nodes on the ComfyUI Registry.

    workflow_comparison

    This node was adapted from the [image_edit] shortcode of Unprompted, my Automatic1111 extension.