We have found one software suitable in our database for this conversion.
TI-Reader Converter can convert images (JPEG, GIF or PNG) that are referenced in a .HTML file which is being converted for formats useable on TI devices. This conversion will produce .v2y (Voyage 200), .9xy (TI-92) or .89y (TI-89) files that can be transferred and later viewed on the respective devices.
You cannot convert just single images, it must always be done as part of HTML conversion.
The TI-Reader Converter is a Windows application that lets you convert text, HTML, or Open eBook (OeB) publication files to binary eBook (BEB) format for viewing using the TI-Reader App on the TI-89, TI-92 Plus, or Voyage 200 personal learning tool (PLT). Teachers, students, and curriculum developers can all use TI-Reader Converter.