i can't speak for other cameras on other devices, but this variable frame rate is how htc squeezes out as much available light as it can under low lighting conditions.
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I think that this is a pretty fair review of the camera, apologies if already posted -
HTC One (M8) Review | PhotographyBLOG
The explanation on the whole purple thing seemed enlightening for me.
HTC hdr instructions -
HTC One (M8) Support - Using HDR | HTC Additional Support
The article said that it takes two images for hdr averaging - the One X series took three.
I think that the hdr mode ought to be subject to a revision update regardless of how many images are used. One expects some artifacts (artificial noise) in hdr shots but from what little I've seen, I think that they can do better here.
I've had my One (M7) since launch on Verizon and never noticed the purple haze that I'm now getting in the corners and edges of some low light shots! I know this is a common issue on the internet, but I haven't found much discussion here on PD. I bought the phone from BB, and have the coverage on it. I'm wondering if anyone here has experience dealing with this as a warranty issue? Thanks for any info!



Cheers mateNo, it's a hardware problem with some phones, triggered if the phone sensor got too hot at some point. There is no software fix for it.