Resize image in gallery block so its not gigantic when i only have one image in the gallery?

I have a basic gallery and if i add rows then the images get smaller, and the overall block is smaller. if i only have 1 row, and 1 image, then that block becomes big and the image is unpresentably large. i can't change the height of the block and force the image to resize based on that. i resort to making an empty block and dropping an image in it which makes the multi-image pages follow a different layout (even if they look the same). i guess i can resort to making them all basic blocks but i like the functionality of the lightbox feature that the gallery has