For example, if you want to force an image to be rendered in PNG, you can use the tpng filter. You can also render an image in greyscale with the fgrey filter. Interlacing of a JPEG image can be achieved with the i1 filter. Multiple filters can be added on top of each other by concatenating them with a simple dot . . For example: tpng.fgrey.ftrim10.
Do not hesitate to contact us if you need any additional filters not listed above.
Filters can be concatenated to obtain, for example, a greyscale image with rounded corners: