Background image options
Once you have uploaded a background image using the background upload button you have 3 options to help format the image.
Background full width
Use this option to make your background image fill the screen from left to right. If the browser is resized the image will be resized to always touch the left and right edge of the browser window.
This option will not make the image stretch from top to bottom. The images depth will be in proportion to the images width. If your images are not very deep to begin with, you can also turn on the ‘Background Tiled’ option.
It is always advisable to use this option if you are using an image like a landscape. Remember people viewing your Tumblr site have different width browsers and screens. Switching the full width option on will mean they always see the entire image.
The Background Tiled option will take your image and repeat it from left to right then top to bottom. It works well with patterns and textures.
By applying this option your background image will sit still when your content is being scrolled. This can be used in conjunction with the other two background image options. Patterns can be a little over powering to the eye when not fixed. Large or repeated images can also benefit from being fixed.