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All images, warps and stacks, have mask images which indicate image flags for each individual pixels. Below is a table that indicates the meaning for each flag. These flags are applicable for both, the warp and stack images.



Image Flags

Mask values which represent features of the detector

Flag namehexadecimal valueDescription
FLAT0x0002Pixel doesn't flat-field properly
DARK0x0004Pixel doesn't dark-subtract properly
BLANK0x0008Pixel doesn't contain valid data
CTE0x0010Pixel has poor Charge Transfer Efficiency
SAT0x0020Pixel is saturated or non-linear

Mask values which represent invalid signal ranges

Flag namehexadecimal valueDescription
SAT0x0020Pixel is saturated or non-linear
LOW0x0040Pixel is low
SUSPECT0x0080Pixel is suspected of being bad

Mask values which represent non-astronomical structures

Flag namehexadecimal valueDescription
BURNTOOL0x0080Pixel may contain uncorrected streak.
CR0x0100Pixel contains a cosmic ray
SPIKE0x0200Pixel contains a diffraction spike
GHOST0x0400Pixel contains an optical ghost
STREAK0x0800Pixel contains a streak
STARCORE0x1000Pixel contains a bright star core

Mask values which identify pixels badly affected by convolutions and interpolations

Flag namehexadecimal valueDescription
CONV.BAD0x2000Pixel is bad after convolution with a bad pixel
CONV.POOR0x4000Pixel is poor after convolution with a bad pixel

Warped image (left) and its mask image (right)

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