Auto updating jpg viewer
Another one is imgv but it seems to have been a long time since it was updated and I cannot find any evidence of whether it supports what you are looking for.
Adding this answer in case someone needs this in the future: Fast Stone image viewer actually does work for this purpose.
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The FREE PDF viewer download of the may be used without limitation for Private, Commercial, Government and all uses, provided it is not -: incorporated or distributed for profit/commercial gain with other software or media distribution of any type - without first gaining permission.
Stand Alone: rotate, rename, delete, move, copy, batch rename, add/Edit Metadata, camera raw image adjustments (crop, resize, exposure, contrast, white balance, curves, etc...) Via Photoshop: contact sheet, merge to HDR, PDF presentation, Photomerge, Web picture gallery Rotate, crop, vertical/horizontal flip, lossless JPEG operations (90° steps), color management, 16bit color depth, Light Table, Exif, IPTC, XMP, GPS metadata, adjust colors/brightness/levels, elaborate Black and White conversion, automatic lens correction, anti-vignetting, sharpening tools, vibrance, many filters, Batch operations, export to archive, HTML, flickr, gallery2, picasaweb, smugmug, i Pod, Facebook, 23hq, flash. Single-click background copy/move to preset location, single-click rating/labeling (writes Adobe XMP sidecar files and/or embeds XMP metadata within JPEG/TIFF/HD Photo/JPEG XR), Windows rating, Color management including custom target profile selection, Unicode support, Exif shooting data (shutter speed, f-stop, ISO speed, exposure compensation...) and real-time, seamless R, G, B histogram in translucent floating window. All major formats, thumbnail view (5 predefined sizes), full screen, magnifier, slideshow. Popups image galery, detailed image informations, editing options at the image border in fullscreen modus.
Add border, filter, effects, resize, rename, raw image converter, recompress, edit color, ...
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And yes, it auto refreshes when your file is changed on disk.
Windows Photo Viewer works just fine for me, but it's picky. If I open the image in WPV from the explorer AND leave the explorer window open on that folder, then WPV updates in about half a second.
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