How to stop Gallery macro from resizing my images?

[Oliver]

Hello, I inserted the Gallery macro to my Confluence page and the image includes test. Although I have plenty of space on the page to display the image the macro is automatically resizing the image. There doesn't seem to be an option to manually resize the image using macro settings.

[Nicolas Casel]

On my side, the Gallery macro is decreasing too much the initial image size, and so it renders a 'pixellized' image.