While many visual sources can be found in the our tab on Digitized Manuscripts Collections, here are some curated collections with more thematic focuses.
This section is devoted to online databases of paintings, often, but not always from manuscripts. Also, see our page for Digitized Manuscript Collections for wholly digitized codices.
"A huge free database of references for Persian paintings, Ottoman paintings, Arab paintings and Mughal paintings. This site enables you to locate printed reproductions, commentaries and weblinks for thousands of Islamic paintings, including illuminated "carpet" pages, decorated Quran pages, and book bindings from over 230 collections all over the world."
"An archive of book paintings--commonly known as Persian Miniatures--that were created to illustrate scenes from the Persian national epic, the Shahnama (the Book of Kings)." Originally started at Princeton University, it is now administrated by Cambridge University.
Chester Beatty Image Gallery (Dublin)
Illustrations from small selections of manuscript pages at the Chester Beatty Library with detailed commentaries.
Mandragore, base des manuscrits enluminés de la BnF (Bibliothèque nationale de France, Paris)
Online catalog of illuminations and illustrations from manuscripts held at the BnF with descriptions and color images available for viewing and download.
Many of the library-cum-museums are listed under Digitized Manuscript Collections