ComfyUI Node: 🍐 Barrel Distortion

🍐 Barrel Distortion:

The BarrelDistortionNode is designed to apply a barrel distortion effect to images, a common technique used to simulate the optical distortion seen in wide-angle lenses. This node allows you to manipulate the curvature of the image, creating a bulging effect that can add a unique artistic touch to your visuals. By adjusting the distortion coefficients and the center of distortion, you can control the intensity and focal point of the effect, making it versatile for various creative applications. The node leverages mathematical transformations to remap image coordinates, ensuring a smooth and realistic distortion effect. This capability is particularly beneficial for AI artists looking to enhance their images with dynamic and engaging visual effects.

🍐 Barrel Distortion Input Parameters:

image

The image parameter is the input image to which the barrel distortion effect will be applied. It is expected to be in a format compatible with the node's processing capabilities, typically a tensor representation of an image. This parameter is crucial as it serves as the base upon which all transformations are applied.

k1

The k1 parameter is a float that controls the primary distortion coefficient. It determines the degree of curvature applied to the image, with a default value of 0.2. The range for k1 is from -1.0 to 1.0, allowing for both inward and outward distortion effects. Adjusting this value will significantly impact the overall intensity of the barrel distortion.

k2

The k2 parameter is a secondary distortion coefficient that further refines the distortion effect. It has a default value of 0.0 and a range from -1.0 to 1.0. This parameter allows for more subtle adjustments to the distortion curve, providing additional control over the image's appearance.

k3

The k3 parameter is a tertiary distortion coefficient, offering even finer control over the distortion effect. Like k2, it defaults to 0.0 and ranges from -1.0 to 1.0. This parameter is useful for achieving complex distortion patterns and enhancing the artistic quality of the image.

center_x

The center_x parameter specifies the horizontal center of the distortion effect as a float, with a default value of 0.5. It ranges from 0.0 to 1.0, representing the relative position across the image width. Adjusting this parameter shifts the focal point of the distortion horizontally, allowing for creative positioning of the effect.

center_y

The center_y parameter defines the vertical center of the distortion effect, also as a float with a default value of 0.5. It ranges from 0.0 to 1.0, indicating the relative position across the image height. This parameter works in conjunction with center_x to determine the exact center of the distortion, enabling precise control over the effect's placement.

scale

The scale parameter is a float that adjusts the overall scale of the distortion effect, with a default value of 1.0. It ranges from 0.1 to 2.0, allowing you to either amplify or reduce the intensity of the distortion. This parameter is essential for fine-tuning the visual impact of the effect on the image.

🍐 Barrel Distortion Output Parameters:

IMAGE

The output of the BarrelDistortionNode is an IMAGE that has been transformed by the barrel distortion effect. This output retains the original image's dimensions and color information but with the added curvature and distortion as specified by the input parameters. The resulting image can be used directly in creative projects or further processed for additional effects.

🍐 Barrel Distortion Usage Tips:

• Experiment with the k1, k2, and k3 parameters to achieve different levels of distortion, from subtle to extreme, to suit your artistic vision.
• Use the center_x and center_y parameters to shift the distortion effect's focal point, creating dynamic compositions that draw the viewer's eye to specific areas of the image.
• Adjust the scale parameter to control the overall intensity of the distortion, ensuring that the effect complements rather than overwhelms the original image.

🍐 Barrel Distortion Common Errors and Solutions:

Image shape mismatch

• Explanation: This error occurs when the input image does not have the expected shape or dimensions, which can prevent the node from processing it correctly.
• Solution: Ensure that the input image is in the correct format, typically a tensor with the appropriate dimensions. Convert or resize the image as necessary before applying the node.

Invalid distortion coefficients

• Explanation: If the k1, k2, or k3 parameters are set outside their valid range, the distortion effect may not be applied correctly.
• Solution: Double-check the values of the distortion coefficients to ensure they fall within the specified range of -1.0 to 1.0. Adjust them as needed to achieve the desired effect.

Center coordinates out of bounds

• Explanation: Setting center_x or center_y outside the range of 0.0 to 1.0 can lead to unexpected results or errors in the distortion effect.
• Solution: Verify that the center coordinates are within the valid range and adjust them to correctly position the distortion effect within the image boundaries.