Fusing one rgb image with one grayscale image using imfuse function

Hi, I used imfuse to combine one rgb image with one grayscale image. After fusing, the rgb image became dimmer. Please suggest how I can increase the intensity of the rgb image.

I used final_image=imfuse(image_rgb, image_gray, 'blend');

Answer 1

[DGM]

The contribution of either image is reduced by half, because that's what a 50% opacity blend is. It's the simple arithmetic mean of two images. Imfuse() can't do any other proportion. It's a simple, inflexible visual comparison tool, not an image composition tool.

Assuming that your images have the same page geometry, and assuming you're using R2016b or newer:

A = imread('cameraman.tif'); % single-channel
B = imread('cmantifBG.png'); % RGB

alph = 0.3;

blended = alph*im2double(A) + (1-alph)*im2double(B);
blended = im2uint8(blended);

montage({A B blended})

If you want something other than simple linear alpha blending, you'll have to elaborate with an example image and a description of what the output should look like.

There are other methods of combining two images, but what's appropriate depends on the object contrast/polarity and which objects are important.

https://www.mathworks.com/matlabcentral/answers/414351-overlay-image-on-top-of-image

https://www.mathworks.com/matlabcentral/answers/859425-how-to-display-multiple-roi-masks-in-different-colors-on-one-image