"
WoodChucker" -
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If you could post the code where you set up your JPEGEncoder and write to it (along with creating a BufferedImage, if you are using one) it would help a lot. It may be that the encoding params on the JPEG are something that is not recognized by MS Photo Editor... have you tried opening it in a browser?
This example code generates an image that I can open in MS Photo Editor... see if you can, too...
Thanks! and welcome to the JavaRanch!