`sig
type pixel_layout = BPP1 | BPP8 | BPP24 | BPP48
type t =
JPEG of Pdfio.bytes * float list option
| JPEG2000 of Pdfio.bytes * float list option
| JBIG2 of Pdfio.bytes * float list option * int option
| Raw of int * int * Pdfimage.pixel_layout * Pdfio.bytes
val get_image_24bpp : Pdf.t -> Pdf.pdfobject -> Pdf.pdfobject -> Pdfimage.t
val colspace : Pdf.t -> Pdf.pdfobject -> Pdf.pdfobject -> Pdfspace.t
val bpc : Pdf.t -> Pdf.pdfobject -> Pdf.pdfobject option
end`