Man pages matching name tiffreadrgbatile in section 3tiff:

TIFFReadRGBATile.3tiff.en	debian 10 / libtiff-dev
TIFFReadRGBATile.3tiff.en	debian 11 / libtiff-dev
TIFFReadRGBATile.3tiff.en	debian 12 / libtiff-dev