Upscale Image By

Documentation

Class name: ImageScaleBy
Category: image/upscaling
Output node: False

The ImageScaleBy node is designed for upscaling images by a specified scale factor using various interpolation methods. It allows for the adjustment of the image size in a flexible manner, catering to different upscaling needs.

Input types

Required

image
- The input image to be upscaled. This parameter is crucial as it provides the base image that will undergo the upscaling process.
- Comfy dtype: IMAGE
- Python dtype: torch.Tensor
upscale_method
- Specifies the interpolation method to be used for upscaling. The choice of method can affect the quality and characteristics of the upscaled image.
- Comfy dtype: COMBO[STRING]
- Python dtype: str
scale_by
- The factor by which the image will be upscaled. This determines the increase in size of the output image relative to the input image.
- Comfy dtype: FLOAT
- Python dtype: float

Output types

image
- Comfy dtype: IMAGE
- The upscaled image, which is larger than the input image according to the specified scale factor and interpolation method.
- Python dtype: torch.Tensor

Usage tips

Infra type: GPU
Common nodes:
- VAEEncode
- [RIFE VFI](../../ComfyUI-Frame-Interpolation/Nodes/RIFE VFI.md)
- VHS_VideoCombine
- VAEEncodeTiled
- Reroute
- PreviewImage
- SaveImage
- SVD_img2vid_Conditioning
- SEGSPreview
- ImageFilterSharpen

Source code

class ImageScaleBy:
    upscale_methods = ["nearest-exact", "bilinear", "area", "bicubic", "lanczos"]

    @classmethod
    def INPUT_TYPES(s):
        return {"required": { "image": ("IMAGE",), "upscale_method": (s.upscale_methods,),
                              "scale_by": ("FLOAT", {"default": 1.0, "min": 0.01, "max": 8.0, "step": 0.01}),}}
    RETURN_TYPES = ("IMAGE",)
    FUNCTION = "upscale"

    CATEGORY = "image/upscaling"

    def upscale(self, image, upscale_method, scale_by):
        samples = image.movedim(-1,1)
        width = round(samples.shape[3] * scale_by)
        height = round(samples.shape[2] * scale_by)
        s = comfy.utils.common_upscale(samples, width, height, upscale_method, "disabled")
        s = s.movedim(1,-1)
        return (s,)

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