how to konw which stars have saturated the CCD on a fits picture?
Matrix wrote on May 13, 2015
Like the topic, when I want to know some stars whether they have saturated the CCD, what can I do?
Mike Fitzpatrick wrote on May 22, 2015
Saturation simply means the values in the image have exceeded the limits of the CCD or ADC, that exact value depends on the CCD in question. A task like MINMAX or IMEXAMINE will help you find these pixels, but it wasn't clear from your question how you would use them. The photometry tasks can detect the saturated pixels and won't use them, but there are other ways you could for instance create a mask. Could you expand on your question?
Matrix wrote on May 23, 2015
Recently I am just doing some photometry, like aperture photometry, point spread function photometry. Some task in these photometry will need you to click the luminous stars, which should not be too faint or saturated, but for a fits picture, I don't know whether the star is saturated or not. You said use the imexamine task can do this check work, how to do it?
Last post on May 23, 2015