Image data products¶
These data products are saved to disk as FITS files. PyEmir makes use of the FITS headers to record information about the data processing. This information may be recorded using other methods as well, such as the GTC Database or the standalone Pontifex database.
The following headers are included in all image data products and record information about the version of Numina and the name and version of the recipe used.
NUMXVER = '0.7.0 ' / Numina package version NUMRNAM = 'DitheredImageRecipe' / Numina recipe name NUMRVER = '0.1.0 ' / Numina recipe version NUMTYP = 'TARGET ' / Data product type
HISTORY
keywords may be used also, but the information in these keyword may not be easily indexed.
Master Bias frames¶
Bias frames are produced by the recipe BiasRecipe
. Each bias frame is a
multiextension FITS file with the following extensions.
Extension name Type Version Contents PRIMARY
Primary The bias level VARIANCE
Image 1 Variance of the bias level obtained from the input frames VARIANCE
Image 2 Variance of the bias level measured on the result frame MAP
Image Number of pixels used to compute the bias level
Master bias frames are represented by MasterBias
.
Master Dark frames¶
Master dark frames are produced by the recipe DarkRecipe
. Each dark frame is a
multiextension FITS file with the following extensions.
Extension name Type Version Contents PRIMARY
Primary The dark level VARIANCE
Image 1 Variance of the dark level obtained from the input frames VARIANCE
Image 2 Variance of the dark level measured on the result frame MAP
Image Number of pixels used to compute the dark level
Master dark frames are represented by MasterDark
.