Grid on Image

Hello, 

I was wondering if there was a way to hide or get rid of the grid involving a raster. Any time I try and delete a section of the grid, it then deletes that section of the image with it. So instead, I was wondering if there were a way I could hid the grid, but keep the actual raster intact? (as seen in the image above)

If there is any further clarification I can provide, please let me know!