Unable to Compute Noise Estimate

[timtrice]

During integration, I was working on different settings of the Winsorized Sigma. When I realized an image I had was not up to par, I removed it from the integration. At that point I started getting the subject error not on the first image but on all subsequent images (I had 35). It didn't matter if I removed images 2 thorugh 10 or even the first, I always got this error message.

When I reinserted the bad image back into the script, the script ran fine. Thinking it may be a registration issue I re-registered all but the bad image. I then ran the Image Integration script again to get the exact same deal.

Bad image which is apparently need is in Dropbox:

https://www.dropbox.com/s/bat5a2oq90wowj8/LIGHT_M92%20_20140812_22h39m20s429_800_1200200900853%2B45c_23c_000612_c_d_r.fit

Edit to add link to three year old issue (not sure if identical): http://pixinsight.com/forum/index.php?topic=2968.0

[Juan Conejero]

More than a 99% of the pixels in this image have zero value (pure black). Somewhere in the process you've applied this image has been severely clipped; only the bright stars have survived. The ImageIntegration process requires a minimum of a 1% of noise pixels to regard a noise estimate as reliable. Similar limits exist in the Debayer and ImageCalibration processes.

[timtrice]

I haven't clipped it. That's how it came out of the registration process. The original RAW looks fine. Nonetheless, I didn't want it processed. But the ImageIntegration would not work without that image. I kept getting the error when I removed it (even when I re-registered the other images using a different reference image).

[pfile]

yes but it is calibrated, which means there's a problem with your calibration frames - it got clipped during calibration. check your darks and dark masters.

rob

[timtrice]

I can understand to an extent it happened in the calibration phase though not sure why it wouldn't have affected my other images. What I don't understand is why I have to include that image in the image integration phase? I have 34 others; I'm okay with that. It's much easier and quicker for me to ignore the bad image and do the II with the other 34 as opposed to starting all over.

[jkmorse]

You don't have to include it.  Just don't load that image into ImageIntegration , or better yet, just delete it from your images folder.

Best,

Jim

[timtrice]

I don't want it; I leave it out but I get the above error whenever I don't include it; even when I registered all but that image...

[pfile]

i guess the other frames may be compromised as well… the lack of the message when not including this frame could be a red herring.

can you post one of the remaining images? most likely they have similar characteristics but it's worth looking.

rob