ComfyUI Node: Batch Color Corrector (beta)

Batch Color Corrector (beta):

BatchColorCorrection is a powerful node designed to apply color correction to a batch of images, enhancing their visual quality by adjusting various color attributes. This node is particularly useful for AI artists who need to process multiple images simultaneously, ensuring consistent color grading across a series of artworks. It leverages advanced techniques such as lift, gamma, and gain adjustments to modify shadows, midtones, and highlights, respectively. Additionally, it offers options for noise addition, white balance, and face enhancement, making it versatile for different artistic styles and requirements. The node operates in different modes, including Auto and Preset, allowing for both automated and manual control over the color correction process. By using this node, you can achieve professional-grade color adjustments, enhancing the overall aesthetic appeal of your images.

Batch Color Corrector (beta) Input Parameters:

original_image

This parameter represents the original input image before any VAE encoding. It serves as the baseline for color correction, allowing the node to compare and adjust the processed image accordingly. The original image is crucial for maintaining the integrity of the initial artwork while applying enhancements.

processed_image

The processed image is the version of the original image after VAE decoding, which may include color shifts. This parameter is essential for identifying and correcting any unwanted color changes introduced during the VAE process, ensuring the final output remains true to the artist's vision.

correction_strength

This float parameter controls the intensity of the color correction applied to the VAE color shifts. With a default value of 0.8, it ranges from 0.0 (no correction) to 1.0 (full correction). Adjusting this parameter allows you to fine-tune the balance between preserving the original image's colors and enhancing them for better visual impact.

method

This parameter offers a selection of color correction methods, including luminance_zones, histogram_matching, statistical_matching, and advanced_3d_lut. Each method provides a different approach to color correction, from professional shadows/midtones/highlights adjustments to advanced 3D color mapping. The default method is advanced_3d_lut, known for its accuracy in color correction.

preserve_inpainted

A boolean parameter that determines whether to correct only the areas that existed in the original image, preserving any new inpainted content. By default, this is set to True, ensuring that newly added elements in the artwork are not altered during the color correction process.

Batch Color Corrector (beta) Output Parameters:

result

The result is the final output image after the batch color correction process. It reflects all the adjustments made based on the input parameters, providing a visually enhanced version of the original artwork. This output is crucial for evaluating the effectiveness of the color correction and ensuring the desired artistic outcome.

Batch Color Corrector (beta) Usage Tips:

• To achieve consistent color grading across multiple images, use the Auto mode for automated adjustments or Preset mode for predefined settings that suit your artistic style.
• Experiment with different method options to find the most suitable color correction technique for your artwork, especially when dealing with complex color shifts.
• Adjust the correction_strength parameter to balance between subtle enhancements and more pronounced color corrections, depending on the desired visual impact.

Batch Color Corrector (beta) Common Errors and Solutions:

"⚠️ WARNING: Enhancement strength > 1.0 with skin tone adjustment may cause color artifacts in highlights."

• Explanation: This warning indicates that the enhancement strength is set too high, which can lead to unwanted color artifacts, particularly in skin tones and highlights.
• Solution: Reduce the enhancement strength to 1.0 or lower to prevent these artifacts and maintain the natural appearance of skin tones.

"⚠️ Strength > 1.0, clamping to 1.0 to prevent artifacts"

• Explanation: The adjusted strength for color correction exceeds the safe limit, which can cause quantization artifacts in the image.
• Solution: Ensure that the strength parameter is set to 1.0 or below to avoid these artifacts and maintain image quality.