Inconsistent page number in image sets

[martinmueller39]

In our EarlyPrint project (https://earlyprint.org) we link from transcriptions of the Text Creation Partnership to images on the Internet Archive IIIF server. For each text this requires a manifest that maps the page number of the TCP transcription to the image number of the IIIF server. This turns out to be a tricky business. Looking up each individual IIIF image is quite slow. Working with the single or double page image of the archive.org interface would be faster, but those image numbers do not square with the IIIF numbers, They are also inconsistent or ambiguous in that you don't necessarily whether the displayed number is an image number or the page number of the printed text. The reader doesn't care, a programmer cares very much. It would be a great help if there were a consistent way of numbering images and if the IIIF number were always displayed, however small, in an ordinary display. And in a double page display there should be an unambiguous way of telling the user (or machine) ,which is left and which is right.