21–30 of 70 posts
I wish there was good software for hot pixel removal in normal digital cameras. Sure you can photoshop pictures one by one, but if you have the same set of bad pixels on every shot and need to remove them in batches? Nothing will do that as far as I know.
digital cameras carried on planes in the early days had cosmic ray issues too. So they sent them by boat. Hell. The ones today do. This is a weird article though. A lot of cameras compensate for dead pixels and cosmic rays. It should also have been designed in every camera to have unique file names. It’s ridiculous they all don’t.
If you use a Sony A7 series camera, every month, the camera will take a picture upon shutting it off, which it uses to remove dead pixels/hot pixels - you can hear it, actually. If ever you have a pixel die or get stuck, you can also manually set the date a couple months ahead and turn it off - it will most likely be fixed when it turns back on.
I wish there was good software for hot pixel removal in normal digital cameras. Sure you can photoshop pictures one by one, but if you have the same set of bad pixels on every shot and need to remove them in batches? Nothing will do that as far as I know.
Loaded all my photos as light frames, prepared and loaded a dark frame, turned off alignement, post-processing etc and turned on "Create a calibrated file for each light frame". It subtracted given dark frame from every photo and exported them to 16-bit TIFFs.
It can be used from command line if you want to automate it more or make custom GUI. Windows only unfortunately, but it is open source.
The noise reduction they're referring to is dark frame subtraction used for thermal noise and defective hot pixel removal (the latter is what the ISS has to worry about.) Numerous cameras from other companies allow for forcing that on at any speed via menu options, not just slower shutter speeds. I had this feature available on an early 2010's Olympus. They called it "Noise Reduction" (not "noise filter", that's diff…
Dark frame subtraction cannot remove cosmic rays. It removes things the camera sees in the dark at the time of dark frame capture. This is things like dead pixels, hot pixels and amp glow. If a cosmic ray was removed by a dark frame, two cosmic rays would have had to happen, one during dark frame and one during the actual capture. They'd have had to be the same intensity and hit the same pixels. This is probably neve…
Earlier quoted context omitted.
It's not about dust on the sensor, it's actually software that maps dead pixels to fill them in every time you take a picture (as well as dark frame offsetting, presumably)
Again… the manual sensor clean action action does both. Granted I mean the manual ‘automatic’
On a Sony E-mount camera, the ultrasonic sensor cleaning doesn't do pixel remapping, only the date trick (or the menu option on electronic shutter models) works to trigger it manually.
It’s a poorly written and badly explained article. The first comment does a great job of explaining why, and how the new “firmware” actually works
> It’s a poorly written and badly explained article .. And the title is erroneous. The firmware used the noise reduction circuits to disguise the effects of cosmic rays on the sensor.
Earlier quoted context omitted.
If you use a Sony A7 series camera, every month, the camera will take a picture upon shutting it off, which it uses to remove dead pixels/hot pixels - you can hear it, actually. If ever you have a pixel die or get stuck, you can also manually set the date a couple months ahead and turn it off - it will most likely be fixed when it turns back on.
So, wait. The camera can fix dead pixels but only does so once a month? Dead pixels are dead easy to detect by the sensor, why don’t they do it immediately? Way to ruin a bunch of photos between cleanups…
digital cameras carried on planes in the early days had cosmic ray issues too. So they sent them by boat. Hell. The ones today do. This is a weird article though. A lot of cameras compensate for dead pixels and cosmic rays. It should also have been designed in every camera to have unique file names. It’s ridiculous they all don’t.
If you use a Sony A7 series camera, every month, the camera will take a picture upon shutting it off, which it uses to remove dead pixels/hot pixels - you can hear it, actually. If ever you have a pixel die or get stuck, you can also manually set the date a couple months ahead and turn it off - it will most likely be fixed when it turns back on.