I have scanned thousands of slides. They have no metadata.
Is there a windows application to quickly enter iptc keywords for each image? It should be keyboard-driven and have autocomplete suggesting previously used keywords.
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I use VueScan. It is a scanning app that will do everything but change your scanning material. However, it works on Mac, and I am not certain it works on Windows, but you can find out by going to https://www.hamrick.com I became aware of them due to the fact that my scanners are older and the mfg's will not upgrade the software to keep up with the OS. So Hamrick keeps everything running for us via this app. It works great and you can enter your own information about your scans. Hope this helps.
IPTC maintains a list of software programs that support IPTC metadata. That would be a good place to start in finding the tool that fits your needs. They list:
Caption Pro Cortex Quebec ExifTool 10.46 Imatch 5.5 Photo Supreme 5.4 Portfolio 2.5.3 STOCKBOX PHOTO 5.40