Save to jpeg/tif

[CharlesW]

I just did my first processing of M31 and I was rather happy with the results for a first time imager. I saved it to jpeg so I could email it to a couple of buddies of mine and the jpeg was a fair representation of what I was seeing in Pixinsight. But, I just finished M42 and I've been trying to save it to jpeg/tif with no success. The resulting image shows only the very brightest stars and the central core of the nebulosity. I've run Histogram Transformation to make sure it was non-linear but that didn't help. Incidentally, the same thing happened with M1 the other night but in that case, the nebulosity wasn't visible. Obviously I'm missing something, any ideas? Thanks

[bitli]

Maybe you forgot to disable STF when you finalized your HT?  So you may have added very little stretch.
Try reload the final fits file (which I hope you kept) and the jpeg files. If you need to enable STF to see them, this is the problem. Make sure to apply HT with STF disabled.
BTW now PI reminds you that an STF is active by a green line along the name of the view.
-- bitli

[CharlesW]

That was exactly the problem. Thank you.

[jerryyyyy]

BTW, best JPEGS for me are acheived by writing a 16-bit TIFF out from PI and read that into Photoshop, then convert to a JPEG in Photoshop.  Images may be 3 times bigger... more detail.