You can add a watermark to your image by layering one image on top of another and adding position parameters.
Filepicker has a limit to how large the images it will accept for conversions can be. The maximum accepted image size is 100,000,000 pixels, so an image with this many pixels could have width and height combinations like 10,000 x 10,000 or 5,000 x 20,000, etc.
||Adds the specified absolute url as a watermark on the image.|
||This size of the watermark, as a percentage of the base image (not the original watermark).|
||Where to put the watermark relative to the base image.
Possible values for vertical position are:
Image with a watermark
Image with a watermark in size 40% of the base image
Image with a watermark in the size 40% of the base image, positioned at the bottom, left corner
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