Fix issue with applying inverting colors for X-ray image with grad-cam mask

[rahmatkhah]

Describe the bug
The colors of the mask get inverted as well when we apply the inversion. This is because the mask and the underlying image is combined into one object through the canvas object and there was difficulty in applying the css effects used normally on the image without the mask on the individual images.

To Reproduce
This behavior applies in all cases.

Expected behavior
The colors of the mask must not get inverted when we apply the inversion.

Screenshots
If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):
N/A

Additional context
N/A