How to switch between image backgrounds and solid-color background

[gezepi]

Shameless self-plug for another option to easily create an image of a certain color:

How to use `#image` function to display a solid color background

In case you really are restricted to only using images, here is a function that creates a 1x1 pixel GIF of the color you specify. Then that can be scaled to the size you want (note effect of fit): #let img-bytes(col) = { //Get values for R, G, B (surely there's a cleaner way of getting these) let r = int((rgb(col).components().at(0) / 100%) * 0xFF) let g = int((rgb(col).components().at(1) / 100%) * 0xFF) let b = int((rgb(col).components().at(2) / 100%) * 0xFF) //Create the GIF byte …