The following information is taken from Waters et al. (2016) and Magnier et al. (2016), which should be cited appropriately.

Image Modified
Schematic of the images and analysis processing stage of the PS1 IPP Pipeline, described in Magnier et al. (2016)

Raw images

After an exposure is taken at the telescope, the raw image files of the 60 CCDs (see PS1 GPC1 camera) are corrected for persistence issues and then handed over to the PS1 Image Processing Pipeline for further analysis. The STScI PS1 Archive does not provide these images.

Camera images

The camera images are created by applying PS1 Exposure detrending to the raw images (i.e., masking, bias subtraction, flat fielding), and determining the astrometric and photometric calibration. The STScI PS1 Archive does not provide these images.

Image artifacts and anomalies

For more info see the PS1 Image artifacts Artifacts and anomaliesAnomalies page.

Warp images (available in DR2)

For more info see the PS1 Warp imagesImages page.

Stack images (DR1)

For more info see the PS1 Stack imagesImages page.

Difference images (

not currently available)

Difference images are created by subtracting a warp from another image, in general the stack, after matching the PSFs and normalization using a spatially varying kernel. All static objects such as galaxies and constant stars are subtracted out, and only the excess flux from the different epochs is left. Even though the differences images are not stored on disk, they can be created, and it is planned to make them accessible through the STScI PS1 interface in a later release.  It is possible that these will be delivered to STScI, and if/when they are we will make them available through the the STScI PS1 interface.  The addition of significant new data products will be highlighted on the PS1 news page and in MAST newsletters.

Mask Image

For more info see the PS1 Mask imageImage page.

Weight Image

For more info see the PS1 Weight imageImage page.