ComfyUI Node: Image Scale Down By

Image Scale Down By:

The easy imageScaleDownBy node is designed to help you reduce the size of an image by a specified scale factor. This node is particularly useful when you need to downscale images for various purposes, such as reducing file size, preparing images for web use, or creating thumbnails. By providing a straightforward method to downscale images, this node ensures that you can maintain the quality of your images while achieving the desired size reduction. The node supports multiple downscaling methods, allowing you to choose the one that best suits your needs.

Image Scale Down By Input Parameters:

image

This parameter represents the input image that you want to downscale. The image should be in a format that the node can process, typically an IMAGE type.

downscale_method

This parameter allows you to select the method used for downscaling the image. The available options are nearest-exact, bilinear, area, bicubic, and lanczos. Each method has its own characteristics and can affect the quality and appearance of the downscaled image. For example, bicubic and lanczos methods generally provide higher quality results but may be slower, while nearest-exact and bilinear are faster but may result in lower quality.

scale_by

This parameter specifies the factor by which the image should be downscaled. It is a floating-point value with a default of 1.0, a minimum of 0.01, and a maximum of 8.0. A value of 1.0 means no scaling, while values less than 1.0 will reduce the image size. For example, a scale_by value of 0.5 will reduce the image dimensions by half.

Image Scale Down By Output Parameters:

image

The output parameter is the downscaled image. This image will have its dimensions reduced according to the specified scale_by factor and the chosen downscale_method. The output image retains the quality as much as possible based on the selected method and scaling factor.

Image Scale Down By Usage Tips:

• To maintain the best quality while downscaling, consider using the bicubic or lanczos methods, especially for images with fine details.
• If you need to quickly downscale an image and quality is not a primary concern, the nearest-exact or bilinear methods can be faster options.
• Experiment with different scale_by values to find the optimal size reduction for your specific use case. For example, a scale_by value of 0.5 is a good starting point for reducing image size by half.

Image Scale Down By Common Errors and Solutions:

"Invalid image format"

• Explanation: The input image is not in a supported format.
• Solution: Ensure that the input image is in a format that the node can process, such as PNG or JPEG.

"Scale factor out of range"

• Explanation: The scale_by value is outside the allowed range of 0.01 to 8.0.
• Solution: Adjust the scale_by value to be within the specified range.

"Unsupported downscale method"

• Explanation: The selected downscale_method is not one of the supported options.
• Solution: Choose a valid downscale method from the available options: nearest-exact, bilinear, area, bicubic, or lanczos.