1. A method for image blending, comprising: generating an intermediate blended image between a first image, having a first image type and a first level of detail, and a second image having a second image type and a second level of detail, the intermediate blended image having an intermediate level of detail between the first level of detail and the second level of detail, the generating comprising: performing structure transfer upon the first image to generate a new image; downsampling the second image to generate a downsampled image having a downsampled size corresponding to a size of the new image; computing a color difference between the new image and the downsampled image; upsampling the color difference to generate an upsampled color difference; and blending a gradient image using an interpolation weight and the upsampled color difference to generate the intermediate blended image; and displaying the intermediate blended image through a visualization during a transition between display of the first image and display of the second image.