The documentation for the function [`ImageOptions()`](https://github.com/go-pdf/fpdf/blob/504c6dd8cc916cd7f2097877efd52cae5f1d8b18/fpdf.go#L3357) doesn't specify the units used for x, y, w, or h. What are they?
The documentation for the function
ImageOptions()doesn't specify the units used for x, y, w, or h. What are they?