Amp glow

Blink several subs, stretched hard. The glow does not move or change, and your dark frames have it too, in the same place.

1. 01

   Amp glow from the sensor

   Some sensor models glow from their own electronics and others do not. Because the glow comes from the camera, it is in dark frames shot with the camera covered.

   FixCalibrate with darks matched to the lights: same exposure, gain, offset and temperature. Darks on CMOS do not scale, so each sub length needs its own.

   Sub-Exposure & Calibration Planner

• Gradients

  A gradient varies with the sky. Amp glow is fixed to the sensor and the same in every frame.

• A light leak

  Amp glow is in darks shot with the camera covered. A leak changes with the light around the rig.

One frame cannot separate amp glow from a leak or a gradient. A dark frame from the same camera can.

After dark subtraction, the corner matches the rest of the background under a hard stretch.

No outside source is cited here. The signature, the causes and their order are the atlas’s own, from imaging experience. The order is a judgment of likelihood; no measured frequency is behind it.