ComfyUI Extension: ComfyUI-Curve

Authored by aiaiaikkk

Created

Updated

84 stars

A professional ComfyUI curve adjustment node that offers Photoshop-like curve functionality, over 70 preset styles, advanced mask support, and histogram analysis.

Custom Nodes (0)

    README

    ComfyUI-Curve

    <!-- 语言切换 | Language Switch --> <div align="center"> <a href="#中文">中文</a> | <a href="#english">English</a> </div>

    中文

    ComfyUI专业色彩调整扩展，提供类似Photoshop的曲线、HSL、色阶调整功能，支持70+种预设风格、高级遮罩和Lightroom风格的色彩分级功能。 image

    🌟 主要功能

    项目介绍视频：https://www.bilibili.com/video/BV1QuMFzRE5i/

    🎨 曲线调整 (PS Curve)

    image

    • 类似Photoshop的专业曲线调整，支持多种插值方式
    • 双击节点进入实时调整界面：在弹出窗口中直接拖动控制点，即刻观察图像变化效果
    • 实时曲线图表，可选直方图背景显示
    • 支持RGB整体或单独R/G/B通道调整
    • 可调曲线效果强度（0-200%）
    • 弹窗内调整立即应用：所有曲线修改无需重新运行工作流即可在弹窗内实时查看效果

    🎭 HSL混色器 (PS HSL)

    image

    • 精准控制8个颜色通道：红、橙、黄、绿、浅绿、蓝、紫、品红
    • 每个颜色可独立调整色相、饱和度、明度
    • 双击节点打开HSL调整弹窗：在弹出窗口中滑动调节器立即显示颜色变化效果，所见即所得
    • 支持遮罩和羽化效果
    • 弹窗内实时交互响应：在弹出界面中调整任何HSL参数都能即时反映在预览图像上

    📊 直方图分析 (Histogram Analysis)

    image

    • 双击节点打开专业直方图分析界面：实时显示RGB和单通道直方图
    • 详细的统计信息：平均值、中位数、标准差等图像统计数据
    • 像素分布可视化：清晰显示图像的亮度和颜色分布情况
    • 实时数据更新：图像变化时直方图实时刷新
    • 多通道支持：可切换查看RGB整体或单独R/G/B通道直方图

    🎚️ 色阶调整 (PS Levels)

    image

    • 双击节点打开Photoshop风格色阶调整界面：专业三点控制（黑场、灰场、白场）
    • 实时预览调整：拖动滑块即时查看色阶调整效果
    • 自动色阶功能：一键自动优化图像对比度和色阶分布
    • 自动对比度功能：智能增强图像对比度
    • 精确数值控制：输入/输出黑白场点、伽马值精确调整
    • 直方图背景显示：在色阶界面中显示实时直方图，便于精确调整

    🎨 色彩分级 (Color Grading)

    image

    • 双击节点打开Lightroom风格的色彩分级界面：专业三色轮设计（阴影、中间调、高光）
    • 实时交互式色轮操作：直接在色轮上拖拽调整色相和饱和度，实时预览效果
    • 负饱和度完全去饱和：-100饱和度实现完全灰度效果，不再产生偏色
    • Shift键负饱和度支持：按住Shift键在色轮上操作可设置负饱和度值
    • 精确的Lab色彩空间处理：使用专业Lab色彩算法，确保色彩准确性
    • 多种混合模式：normal、multiply、screen、overlay、soft_light等专业混合选项
    • 区域智能遮罩：基于亮度的平滑过渡遮罩，精确控制阴影、中间调、高光区域
    • 强度控制：可调整整体效果强度（0-200%）

    🖼️ 预设风格 (PS Curve Preset)

    • 70+种专业调色预设
    • 涵盖人像、风景、电影、复古等多种风格
    • 一键应用，快速实现专业调色效果

    🎯 高级遮罩支持

    • 选择性调整特定区域
    • 遮罩边缘羽化，自然过渡
    • 支持遮罩反转

    💡 交互式编辑

    • 双击节点打开专业调整弹窗，在弹出界面中实时预览调整效果
    • 弹窗内所有调整参数实时同步，无需重新运行工作流
    • 零延迟反馈：在弹出窗口中调整参数时图像实时更新，像使用专业图像编辑软件一样流畅
    • 支持曲线、HSL和色彩分级节点的交互式编辑
    • 类似Photoshop的专业编辑体验

    📥 安装方法

    Git克隆（推荐）

    cd ComfyUI/custom_nodes
git clone https://github.com/aiaiaikkk/ComfyUI-Curve.git

    手动下载

    1. 下载ZIP文件
    2. 解压到 ComfyUI/custom_nodes/ComfyUI-Curve
    3. 重启ComfyUI

    依赖要求

    • torch>=1.9.0
    • numpy>=1.21.0
    • scipy>=1.7.0

    📝 使用技巧

    如何使用弹窗实时预览功能

    1. 曲线调整实时预览：

      • 在工作流中添加PS Curve节点
      • 连接输入图像和遮罩（可选）
      • 双击节点打开调整弹窗
      • 此时您可以看到弹出窗口中的图像预览区域和曲线编辑区域
      • 在弹窗内曲线上添加控制点：点击曲线添加新控制点
      • 在弹窗内拖动控制点：左键按住并拖动控制点，观察图像实时变化
      • 在弹窗内删除控制点：右键点击控制点
      • 在弹窗内切换通道：点击RGB、R、G、B按钮切换不同通道曲线
      • 在弹窗内调整强度：移动强度滑块即时查看不同强度效果
      • 完成后点击弹窗中的应用按钮，参数将自动同步到节点

    2. HSL调整实时预览：

      • 在工作流中添加PS HSL节点
      • 连接输入图像和遮罩（可选）
      • 双击节点打开HSL调整弹窗
      • 在弹出窗口中选择您想调整的颜色通道（红、橙、黄等）
      • 在弹窗内移动色相滑块：左右拖动调整该颜色的色相值
      • 在弹窗内移动饱和度滑块：左右拖动调整该颜色的饱和度
      • 在弹窗内移动明度滑块：左右拖动调整该颜色的明度
      • 弹窗内每个滑块调整都会实时更新预览图像
      • 完成后点击弹窗中的应用按钮，参数将自动同步到节点

    3. Color Grading调整实时预览：

      • 在工作流中添加Color Grading节点
      • 连接输入图像和遮罩（可选）
      • 双击节点打开色彩分级调整弹窗
      • 在弹出窗口中您将看到三个色轮：阴影、中间调和高光
      • 色轮操作技巧：
        • 普通点击拖拽：设置正饱和度（增强颜色）
        • 按住Shift键拖拽：设置负饱和度（去饱和效果）
        • 色轮指示器颜色：白色=正饱和度，灰色=负饱和度
      • 饱和度滑块：-100到+100范围
        • 正值：增强该区域的颜色饱和度
        • 负值：降低该区域的颜色饱和度（朝向灰度）
        • -100：该区域完全去饱和变为灰度
      • 使用亮度滑块调整各区域明暗程度
      • 选择混合模式控制颜色应用方式
      • 调整整体强度控制效果程度
      • 预览窗口实时更新，所见即所得
      • 完成后点击弹窗中的应用按钮，参数将自动同步到节点

    4. 直方图分析实时查看：

      • 在工作流中添加Histogram Analysis节点
      • 连接输入图像
      • 双击节点打开直方图分析弹窗
      • 在弹出窗口中查看实时直方图显示
      • 通道切换：点击RGB、R、G、B按钮切换不同通道的直方图
      • 统计信息查看：在弹窗中查看平均值、中位数、标准差等详细数据
      • 像素分布分析：观察直方图峰值和分布，了解图像特征
      • 直方图会随输入图像变化实时更新

    5. 色阶调整实时预览：

      • 在工作流中添加PS Levels节点
      • 连接输入图像和遮罩（可选）
      • 双击节点打开色阶调整弹窗
      • 在弹出窗口中您将看到带直方图背景的色阶调整界面
      • 三点控制调整：
        • 左侧滑块：调整黑场点（输入暗部范围）
        • 中间滑块：调整伽马值（中间调亮度）
        • 右侧滑块：调整白场点（输入亮部范围）
      • 输出色阶调整：设置输出的黑白场范围
      • 自动功能：
        • 点击"自动色阶"按钮自动优化图像对比度
        • 点击"自动对比度"按钮智能增强对比度
      • 所有调整都会在预览窗口中实时显示效果
      • 完成后点击弹窗中的应用按钮，参数将自动同步到节点

    6. 弹窗预览界面通用操作：

      • 放大/缩小预览：在弹窗内使用鼠标滚轮或+/-按钮
      • 平移预览：在弹窗内按住中键并拖动
      • 对比原图：在弹窗内按住空格键查看原始图像，释放返回调整后效果
      • 重置参数：点击弹窗内的重置按钮恢复默认设置
      • 取消编辑：点击弹窗内的取消按钮放弃当前更改
      • 应用编辑：点击弹窗内的应用按钮确认更改并同步到节点

    曲线调整技巧

    • S形曲线：增加对比度
    • 反S形：减少对比度
    • 上移曲线：提亮图像
    • 下移曲线：压暗图像
    • 曲线格式：x1,y1;x2,y2;x3,y3（例如：0,0;128,150;255,255）
    • 实时预览技巧：在弹窗中使用多个控制点微调局部区域，观察实时效果找到最佳调整

    HSL调整技巧

    • 肤色调整：微调红橙色相和饱和度
    • 天空增强：调整蓝色和浅绿通道
    • 叶绿增强：调整绿色和黄色通道
    • 日落效果：增强橙色和品红通道
    • 实时预览技巧：在弹窗中逐个通道调整并观察实时效果，找到理想的颜色平衡点

    直方图分析技巧

    • 亮度分布判断：
      • 左侧堆积：图像偏暗，考虑提亮处理
      • 右侧堆积：图像偏亮，考虑压暗处理
      • 中间集中：对比度较低，需要增强对比
      • 双峰分布：图像层次丰富，对比度良好
    • 颜色通道分析：
      • R/G/B通道偏移：判断色偏问题
      • 某通道过度集中：该颜色饱和度可能过高或过低
    • 统计数据应用：
      • 平均值：判断整体亮度水平
      • 标准差：评估图像对比度和层次
      • 中位数：了解像素分布的平衡点

    色阶调整技巧

    • 三点控制策略：
      • 黑场点：设置图像中最暗部分的位置，影响阴影细节
      • 白场点：设置图像中最亮部分的位置，影响高光细节
      • 伽马值：调整中间调亮度，<1变亮，>1变暗
    • 自动功能使用：
      • 自动色阶：适合欠曝或过曝图像的快速修正
      • 自动对比度：适合对比度不足的平淡图像
    • 输出色阶控制：
      • 压缩动态范围：适合打印输出或特殊效果
      • 扩展输出范围：增强图像对比度
    • 结合直方图调整：观察直方图变化，避免过度调整导致的色阶断层

    Color Grading技巧

    • 饱和度调整技巧：
      • 正饱和度（1-100）：增强该区域的颜色鲜艳度
      • 负饱和度（-1到-100）：降低该区域的颜色鲜艳度，朝向灰度
      • 全区域-100饱和度：实现完全灰度效果，适合制作黑白照片基底
      • 选择性去饱和：只对特定区域（如阴影或高光）设置负饱和度
    • 色轮操作技巧：
      • 普通拖拽：调整色相和正饱和度
      • Shift+拖拽：调整色相和负饱和度（去饱和方向）
      • 观察指示器：白色圆点=正饱和度，灰色圆点=负饱和度
    • 风格化调色：
      • 电影风格：阴影区域添加蓝色，高光添加暖色
      • 复古效果：阴影添加青色，高光添加橙黄色
      • 日落效果：阴影添加紫色，高光添加橙色
      • 冷调风格：所有区域朝向蓝青色调整
      • 暖调风格：所有区域朝向橙黄色调整
    • 混合模式应用：
      • soft_light：自然的颜色增强，适合微调
      • overlay：强烈的对比增强，适合戏剧效果
      • multiply：压暗效果，适合营造神秘氛围
      • screen：提亮效果，适合梦幻风格

    遮罩应用技巧

    • 人像皮肤：建议2-4像素羽化
    • 天空背景：建议5-10像素羽化
    • 物体边缘：建议1-3像素羽化
    • 大面积区域：建议8-15像素羽化

    🆕 最近更新

    Color Grading功能重大改进

    • 修复饱和度-100偏色问题：现在-100饱和度能实现完全灰度效果，不再产生青色等偏色
    • 新增负饱和度支持：-100到+100完整饱和度范围，负值实现去饱和效果
    • Shift键交互增强：按住Shift键在色轮上操作可设置负饱和度值
    • 色轮视觉指示器：白色指示器表示正饱和度，灰色指示器表示负饱和度
    • Lab色彩空间优化：修正了Lab中性值计算，确保完全去饱和时的色彩准确性
    • 全局去饱和检测：当所有区域都设为-100饱和度时，自动应用全局灰度转换
    • 改进的亮度遮罩算法：使用sigmoid函数创建平滑过渡，更接近Lightroom效果
    • 多种混合模式支持：添加multiply、screen、overlay、soft_light等专业混合选项
    • 实时预览性能优化：提升弹窗内预览响应速度和准确性

    📄 许可证

    MIT许可证 - 查看 LICENSE 文件。

    English

    Professional color adjustment extension for ComfyUI with Photoshop-like Curve, HSL, and Levels adjustment functionality, 70+ preset styles, advanced mask support, and Lightroom-style Color Grading. The standout feature is the ability to double-click nodes to open popup windows with real-time preview that allows you to color grade with the precision of professional image editing software.

    🌟 Key Features

    🎨 Curve Adjustment (PS Curve)

    • Professional Photoshop-style curve adjustment with multiple interpolation methods
    • Double-click node for real-time adjustment interface: Directly drag control points in the popup window and instantly see image changes
    • Real-time curve chart with optional histogram background display
    • Support for RGB overall or individual R/G/B channel adjustment
    • Adjustable curve effect intensity (0-200%)
    • Popup window adjustments apply immediately: All curve modifications can be viewed in real-time within the popup without re-running the workflow

    🎭 HSL Adjustment (PS HSL)

    • Precise control over 8 color channels: Red, Orange, Yellow, Green, Cyan, Blue, Purple, Magenta
    • Independent adjustment of Hue, Saturation, and Lightness for each color
    • Double-click node to open HSL adjustment popup: Slide controllers in the popup window to immediately see color change effects, WYSIWYG
    • Support for masks and feathering effects
    • Real-time interactive response in popup: Any HSL parameter adjustment in the popup interface instantly reflects in the preview image

    📊 Histogram Analysis

    • Double-click node for professional histogram analysis interface: Real-time display of RGB and individual channel histograms
    • Detailed statistical information: Mean, median, standard deviation and other image statistics
    • Pixel distribution visualization: Clear display of image brightness and color distribution
    • Real-time data updates: Histogram refreshes instantly when image changes
    • Multi-channel support: Switch between RGB overall or individual R/G/B channel histograms

    🎚️ Levels Adjustment (PS Levels)

    • Double-click node for Photoshop-style levels adjustment interface: Professional three-point control (black point, gray point, white point)
    • Real-time preview adjustment: Drag sliders to instantly see levels adjustment effects
    • Auto levels function: One-click automatic optimization of image contrast and level distribution
    • Auto contrast function: Intelligent image contrast enhancement
    • Precise numerical control: Accurate adjustment of input/output black/white points and gamma values
    • Histogram background display: Shows real-time histogram in levels interface for precise adjustments

    🎨 Color Grading

    • Double-click for Lightroom-style color grading interface: Professional three-wheel design (shadows, midtones, highlights)
    • Real-time interactive color wheel operation: Directly drag on wheels to adjust hue and saturation with instant preview
    • Full desaturation at -100 saturation: -100 saturation achieves complete grayscale effect without color cast
    • Shift key for negative saturation: Hold Shift while operating on color wheels to set negative saturation values
    • Precise Lab color space processing: Professional Lab color algorithm ensures color accuracy
    • Multiple blend modes: normal, multiply, screen, overlay, soft_light and other professional blending options
    • Intelligent region masking: Smooth transition masks based on luminance for precise control of shadows, midtones, highlights
    • Strength control: Adjustable overall effect intensity (0-200%)

    🖼️ Preset Styles (PS Curve Preset)

    • 70+ professional color grading presets
    • Covers portrait, landscape, cinematic, vintage, and more
    • One-click application for quick professional color grading

    🎯 Advanced Mask Support

    • Selective adjustment of specific areas
    • Mask edge feathering for natural transitions
    • Support for mask inversion

    💡 Interactive Editing

    • Double-click nodes to open professional adjustment popup with real-time preview in the window
    • All adjustment parameters in the popup sync instantly without re-running the workflow
    • Zero-delay feedback: Images update in real-time in the popup window as parameters are adjusted, as smooth as using professional image editing software
    • Supports interactive editing for Curve, HSL and Color Grading nodes
    • Professional editing experience similar to Photoshop and Lightroom

    📥 Installation

    Git Clone (Recommended)

    cd ComfyUI/custom_nodes
git clone https://github.com/aiaiaikkk/ComfyUI-Curve.git

    Manual Download

    1. Download ZIP file
    2. Extract to ComfyUI/custom_nodes/ComfyUI-Curve
    3. Restart ComfyUI

    Dependencies

    • torch>=1.9.0
    • numpy>=1.21.0
    • scipy>=1.7.0

    📝 Usage Tips

    How to Use Popup Real-time Preview

    1. Curve Adjustment Real-time Preview:

      • Add PS Curve node to your workflow
      • Connect input image and mask (optional)
      • Double-click the node to open the adjustment popup window
      • You'll see the image preview area and curve editing area in the popup
      • Add control points in the popup: Click on the curve to add a new control point
      • Move control points in the popup: Left-click and drag a control point to see real-time image changes
      • Delete control points in the popup: Right-click on a control point
      • Switch channels in the popup: Click on RGB, R, G, B buttons to toggle different channel curves
      • Adjust intensity in the popup: Move the intensity slider to instantly see different strength effects
      • When finished, click Apply in the popup window and parameters will automatically sync to the node

    2. HSL Adjustment Real-time Preview:

      • Add PS HSL node to your workflow
      • Connect input image and mask (optional)
      • Double-click the node to open the HSL adjustment popup window
      • In the popup window, select the color channel you want to adjust (Red, Orange, Yellow, etc.)
      • Move Hue slider in the popup: Drag left/right to adjust the hue value for that color
      • Move Saturation slider in the popup: Drag left/right to adjust the saturation
      • Move Lightness slider in the popup: Drag left/right to adjust the lightness
      • Each slider adjustment in the popup will update the preview image in real-time
      • When finished, click Apply in the popup window and parameters will automatically sync to the node

    3. Color Grading Real-time Preview:

      • Add Color Grading node to your workflow
      • Connect input image and mask (optional)
      • Double-click the node to open the color grading popup window
      • In the popup, you'll see three color wheels for shadows, midtones, and highlights
      • Color wheel operation techniques:
        • Normal click and drag: Set positive saturation (enhance colors)
        • Hold Shift key and drag: Set negative saturation (desaturation effect)
        • Wheel indicator colors: White circle = positive saturation, Gray circle = negative saturation
      • Saturation sliders: -100 to +100 range
        • Positive values: Enhance color saturation in that region
        • Negative values: Reduce color saturation in that region (toward grayscale)
        • -100: Complete desaturation of that region to grayscale
      • Use luminance sliders to adjust brightness levels for each region
      • Select blend mode to control how colors are applied
      • Adjust overall strength to control effect intensity
      • Preview window updates in real-time, showing exactly what you'll get
      • When finished, click Apply in the popup window and parameters will automatically sync to the node

    4. Histogram Analysis Real-time View:

      • Add Histogram Analysis node to your workflow
      • Connect input image
      • Double-click the node to open histogram analysis popup
      • View real-time histogram display in the popup window
      • Channel switching: Click RGB, R, G, B buttons to switch between different channel histograms
      • Statistics viewing: View detailed data like mean, median, standard deviation in the popup
      • Pixel distribution analysis: Observe histogram peaks and distribution to understand image characteristics
      • Histogram updates in real-time as input image changes

    5. Levels Adjustment Real-time Preview:

      • Add PS Levels node to your workflow
      • Connect input image and mask (optional)
      • Double-click the node to open levels adjustment popup
      • In the popup window you'll see levels adjustment interface with histogram background
      • Three-point control adjustment:
        • Left slider: Adjust black point (input shadow range)
        • Middle slider: Adjust gamma value (midtone brightness)
        • Right slider: Adjust white point (input highlight range)
      • Output levels adjustment: Set output black and white point range
      • Auto functions:
        • Click "Auto Levels" button to automatically optimize image contrast
        • Click "Auto Contrast" button for intelligent contrast enhancement
      • All adjustments display effects in real-time in the preview window
      • When finished, click Apply in the popup window and parameters will automatically sync to the node

    6. Popup Preview Interface Common Operations:

      • Zoom in/out preview: Use mouse wheel or +/- buttons in the popup
      • Pan preview: Hold middle mouse button and drag in the popup
      • Compare with original: Hold spacebar in the popup to view original image, release to return to adjusted effect
      • Reset parameters: Click the reset button in the popup to restore default settings
      • Cancel editing: Click cancel button in the popup to discard current changes
      • Apply editing: Click apply button in the popup to confirm changes and sync to node

    Curve Adjustment Tips

    • S-curve: Increases contrast
    • Inverse S-curve: Reduces contrast
    • Moving curve up: Brightens image
    • Moving curve down: Darkens image
    • Curve format: x1,y1;x2,y2;x3,y3 (e.g., 0,0;128,150;255,255)
    • Real-time preview tip: Use multiple control points in the popup window to fine-tune local areas, observe real-time effects to find optimal adjustments

    HSL Adjustment Tips

    • Skin tone adjustment: Fine-tune Red and Orange hue and saturation
    • Sky enhancement: Adjust Blue and Cyan channels
    • Foliage enhancement: Adjust Green and Yellow channels
    • Sunset effect: Enhance Orange and Magenta channels
    • Real-time preview tip: In the popup window, adjust channels one by one while observing real-time effects to find the ideal color balance

    Histogram Analysis Tips

    • Brightness distribution assessment:
      • Left-side clustering: Image is too dark, consider brightening
      • Right-side clustering: Image is too bright, consider darkening
      • Center concentration: Low contrast, needs contrast enhancement
      • Bimodal distribution: Rich image layers with good contrast
    • Color channel analysis:
      • R/G/B channel shifts: Identify color cast issues
      • Excessive concentration in one channel: Color saturation may be too high or low
    • Statistical data application:
      • Mean: Judge overall brightness level
      • Standard deviation: Evaluate image contrast and tonal range
      • Median: Understand pixel distribution balance point

    Levels Adjustment Tips

    • Three-point control strategy:
      • Black point: Set position of darkest part in image, affects shadow detail
      • White point: Set position of brightest part in image, affects highlight detail
      • Gamma value: Adjust midtone brightness, <1 brightens, >1 darkens
    • Auto function usage:
      • Auto Levels: Suitable for quick correction of underexposed or overexposed images
      • Auto Contrast: Suitable for flat images lacking contrast
    • Output levels control:
      • Compress dynamic range: Suitable for print output or special effects
      • Expand output range: Enhance image contrast
    • Combined histogram adjustment: Observe histogram changes to avoid over-adjustment causing tone breaks

    Color Grading Tips

    • Saturation adjustment techniques:
      • Positive saturation (1-100): Enhance color vibrancy in that region
      • Negative saturation (-1 to -100): Reduce color vibrancy toward grayscale
      • All regions at -100 saturation: Achieve complete grayscale effect, perfect for black & white photo foundation
      • Selective desaturation: Apply negative saturation only to specific regions (shadows or highlights)
    • Color wheel operation techniques:
      • Normal drag: Adjust hue and positive saturation
      • Shift+drag: Adjust hue and negative saturation (desaturation direction)
      • Watch indicators: White dot = positive saturation, Gray dot = negative saturation
    • Stylistic color grading:
      • Cinematic look: Add blue to shadows and warm tones to highlights
      • Vintage effect: Add cyan to shadows and orange/yellow to highlights
      • Sunset effect: Add purple to shadows and orange to highlights
      • Cool tone style: Adjust all regions toward blue-cyan tones
      • Warm tone style: Adjust all regions toward orange-yellow tones
    • Blend mode applications:
      • soft_light: Natural color enhancement, suitable for subtle adjustments
      • overlay: Strong contrast enhancement, suitable for dramatic effects
      • multiply: Darkening effect, suitable for creating mysterious atmosphere
      • screen: Brightening effect, suitable for dreamy styles

    Mask Application Tips

    • Portrait skin: Recommended 2-4 pixel feathering
    • Sky background: Recommended 5-10 pixel feathering
    • Object edges: Recommended 1-3 pixel feathering
    • Large areas: Recommended 8-15 pixel feathering

    🆕 Recent Updates

    Major Color Grading Improvements

    • Fixed -100 saturation color cast issue: -100 saturation now achieves complete grayscale effect without cyan or other color casts
    • Added negative saturation support: Full -100 to +100 saturation range, negative values achieve desaturation effects
    • Enhanced Shift key interaction: Hold Shift key while operating on color wheels to set negative saturation values
    • Color wheel visual indicators: White indicators for positive saturation, gray indicators for negative saturation
    • Lab color space optimization: Corrected Lab neutral value calculations for accurate color when fully desaturated
    • Global desaturation detection: Automatically applies global grayscale conversion when all regions are set to -100 saturation
    • Improved luminance mask algorithm: Uses sigmoid functions for smooth transitions, closer to Lightroom effects
    • Multiple blend mode support: Added multiply, screen, overlay, soft_light and other professional blending options
    • Real-time preview performance optimization: Improved popup preview response speed and accuracy

    📄 License

    MIT License - See LICENSE file.

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