ComfyUI Node: 🔧 Image Apply LUT

🔧 Image Apply LUT+:

The ImageApplyLUT+ node is designed to apply a Look-Up Table (LUT) to an image, allowing you to transform the colors and tones of your image based on predefined LUT files. This node is particularly useful for color grading, enhancing visual aesthetics, and achieving specific artistic effects. By using LUTs, you can quickly and consistently apply complex color transformations that would otherwise require extensive manual adjustments. The node supports gamma correction and value clipping to ensure the output image maintains the desired visual quality. Additionally, you can control the strength of the LUT application, blending the original and transformed images to achieve the perfect balance.

🔧 Image Apply LUT+ Input Parameters:

image

This parameter accepts the input image that you want to transform using the LUT. The image should be in a compatible format and will be processed to apply the color transformations defined by the LUT file.

lut_file

This parameter specifies the LUT file to be used for the color transformation. The LUT file should be in the Iridas Cube format and located in the designated LUT directory. The LUT file defines the mapping of input colors to output colors, enabling the desired color grading effect.

gamma_correction

This boolean parameter determines whether gamma correction should be applied to the image before and after the LUT transformation. Gamma correction adjusts the brightness of the image to match the non-linear perception of human vision. The default value is False.

clip_values

This boolean parameter controls whether the values in the LUT should be clipped to the domain of the LUT. Clipping ensures that the transformed values remain within the valid range, preventing any out-of-bounds color values. The default value is False.

strength

This parameter controls the strength of the LUT application, allowing you to blend the original image with the LUT-transformed image. The value ranges from 0.0 to 1.0, where 0.0 means no LUT application and 1.0 means full LUT application. The default value is 1.0.

🔧 Image Apply LUT+ Output Parameters:

IMAGE

The output is the transformed image with the LUT applied. This image reflects the color grading and transformations defined by the LUT file, adjusted for any gamma correction and value clipping specified in the input parameters. The output image maintains the same dimensions and format as the input image.

🔧 Image Apply LUT+ Usage Tips:

• To achieve a subtle color grading effect, use a lower strength value to blend the original and LUT-transformed images.
• Experiment with different LUT files to find the one that best enhances the visual aesthetics of your image.
• Enable gamma correction if you notice that the colors in the transformed image appear too dark or too bright, as this can help achieve a more natural look.

🔧 Image Apply LUT+ Common Errors and Solutions:

LUT file not found

• Explanation: The specified LUT file could not be located in the designated directory.
• Solution: Ensure that the LUT file exists in the correct directory and that the file name is spelled correctly.

Invalid LUT file format

• Explanation: The provided LUT file is not in the Iridas Cube format or is corrupted.
• Solution: Verify that the LUT file is in the correct format and try using a different LUT file.

Image and LUT domain mismatch

• Explanation: The domain of the LUT does not match the expected range of the input image.
• Solution: Ensure that the LUT file is compatible with the input image and consider enabling value clipping to address domain mismatches.