ComfyUI Node: ◎ Radiance Float32 Color Correct

◎ Radiance Float32 Color Correct:

The Float32ColorCorrect node is designed to provide professional-grade color correction for images processed in 32-bit float precision, which is particularly beneficial for high dynamic range (HDR) imaging. This node allows you to adjust various aspects of an image's color properties, including exposure, contrast, saturation, and gamma, as well as per-channel lift and gain. By operating in 32-bit float precision, it ensures that the full dynamic range of the image is preserved without clamping, making it ideal for HDR workflows. The node is capable of handling high dynamic range values, ensuring that no detail is lost in the highlights or shadows, and it provides a robust set of tools for fine-tuning the visual output of your images.

◎ Radiance Float32 Color Correct Input Parameters:

image

The image parameter is the input image that you want to color correct. It is processed in 32-bit float precision, which allows for a wide dynamic range and precise adjustments without losing detail. This parameter is essential as it serves as the base for all subsequent color corrections.

exposure

The exposure parameter allows you to adjust the brightness of the image in stops. A value of +1 doubles the brightness, while -1 halves it. The default value is 0.0, with a range from -10.0 to 10.0. This parameter is useful for correcting images that are too dark or too bright, helping to achieve the desired visual balance.

contrast

The contrast parameter controls the difference between the darkest and lightest parts of the image. It has a default value of 1.0, with a range from 0.0 to 4.0. Increasing contrast makes the image appear more vivid, while decreasing it can create a softer look. This parameter is crucial for enhancing the visual impact of an image.

saturation

The saturation parameter adjusts the intensity of the colors in the image. A value of 0.0 results in a grayscale image, while higher values increase color intensity. This parameter is important for achieving the desired color vibrancy and can be used to make images more visually appealing.

gamma

The gamma parameter affects the midtones of the image, allowing for adjustments in brightness without altering the shadows and highlights significantly. This parameter is useful for fine-tuning the overall tonal balance of the image.

lift

The lift parameter adjusts the shadows of the image, allowing for control over the darker areas. This can be used to bring out details in the shadows or to create a specific mood by darkening them.

gain

The gain parameter affects the highlights of the image, providing control over the brighter areas. This is useful for ensuring that highlights are not blown out and retain detail.

◎ Radiance Float32 Color Correct Output Parameters:

image

The output image is the color-corrected version of the input image, processed in 32-bit float precision. This output retains the full dynamic range and reflects all the adjustments made through the input parameters, providing a high-quality result suitable for HDR workflows.

◎ Radiance Float32 Color Correct Usage Tips:

• To maintain the natural look of an image while enhancing its visual appeal, start with small adjustments to exposure and contrast, and gradually increase them as needed.
• Use the saturation parameter carefully to avoid oversaturation, which can make the image look unnatural. A slight increase can often make colors pop without losing realism.
• When working with HDR images, ensure that the clamp_output option is set to False to preserve the full dynamic range and prevent loss of detail in highlights and shadows.

◎ Radiance Float32 Color Correct Common Errors and Solutions:

"all-default must return input unchanged"

• Explanation: This error indicates that the node should return the input image unchanged when all parameters are set to their default values.
• Solution: Ensure that no parameters are inadvertently altered from their default settings if you expect the input to remain unchanged.

"HDR values must not be clamped"

• Explanation: This error occurs when HDR values are clamped, which should not happen by default.
• Solution: Verify that the clamp_output parameter is set to False to allow HDR values to remain unclamped.

"exposure must not produce Inf"

• Explanation: This error suggests that the exposure adjustment has resulted in infinite values, which can occur with extreme settings.
• Solution: Adjust the exposure parameter to a more moderate value to prevent infinite results and ensure the image remains within a valid range.