ComfyUI Node: Luminosity match v4.7.3

Luminosity match v4.7.3:

The tri3d-luminosity-match node is designed to adjust the luminosity of an image to match a target luminosity profile. This node is particularly useful in image processing tasks where consistent lighting and brightness are crucial, such as in compositing or background replacement. By aligning the luminosity of different image elements, it ensures a seamless blend, enhancing the visual coherence of the final output. The node operates by manipulating the luminosity channel of an image, allowing for precise control over the brightness levels without affecting the color information. This capability is essential for maintaining the natural appearance of images while achieving the desired lighting effects.

Luminosity match v4.7.3 Input Parameters:

luminosity_as_mask

This parameter represents the mask used to define the areas of the image where luminosity adjustments should be applied. It is crucial for isolating specific regions that require brightness matching, ensuring that the rest of the image remains unaffected. The mask is typically a binary image where the areas to be adjusted are marked. This allows for targeted luminosity correction, which is essential for tasks like background blending or object highlighting.

threshold_fraction

The threshold_fraction parameter determines the sensitivity of the luminosity adjustment process. It defines the fraction of the luminosity histogram that should be considered for matching. A lower value results in more aggressive adjustments, while a higher value leads to subtler changes. The parameter accepts a float value ranging from 0.0 to 0.5, with a default of 0.001. This flexibility allows users to fine-tune the luminosity matching process according to the specific requirements of their project.

Luminosity match v4.7.3 Output Parameters:

histogram lower limit (x1) as INT

This output provides the lower limit of the luminosity histogram after the matching process. It indicates the minimum luminosity value that was adjusted, offering insight into the range of changes applied to the image. Understanding this limit helps in assessing the extent of luminosity correction and ensuring that the adjustments align with the desired visual outcome.

histogram upper limit (x2) as INT

Similar to the lower limit, this output specifies the upper limit of the luminosity histogram post-adjustment. It reflects the maximum luminosity value that was altered, providing a complete picture of the luminosity range affected by the node. This information is valuable for evaluating the effectiveness of the luminosity matching and ensuring that the image maintains its intended brightness levels.

Luminosity match v4.7.3 Usage Tips:

• To achieve a natural look when matching luminosity, start with a higher threshold_fraction and gradually decrease it until the desired effect is achieved.
• Use a well-defined mask to isolate the areas of the image that require luminosity adjustment, ensuring that the rest of the image remains unaffected.

Luminosity match v4.7.3 Common Errors and Solutions:

Input format is not correct, got different batch sizes for each input image

• Explanation: This error occurs when the input images have mismatched batch sizes, which prevents the node from processing them correctly.
• Solution: Ensure that all input images have the same batch size before passing them to the node.

Resolution of different layers do not match

• Explanation: This error indicates that the input layers have different resolutions, which can lead to incorrect processing.
• Solution: Verify that all input layers have matching resolutions to ensure proper functionality of the node.