Repairing Artifacts and Cosmetic Defects
Cosmetic repair tools are used to correct blemishes and other artifacts in images. Use the commands below to repair the following types of defects. In addition, you may wish to create synthetic images and add defects in order to evaluate your repairing techniques.
The table below matches the defect type to a command that can be used to correct it.
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Description of Artifact: |
Commands to Use: |
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Isolated hot or cold pixels |
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Residual hot or cold pixels that are not corrected by removing the dark current |
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Hot columns and Cold Traps |
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Defect clusters larger than 1 pixel in area |
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Cosmic rays and ionizing radiation events |
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Stars that interfere with photometric measurements |
In addition to commands listed in the table above, the Combine Images command can be used to reject artifacts that do not align at the same pixel locations in an image set.
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Repairs isolated pixels using coordinates loaded from a file containing x,y positions of the bad pixels. Use this for repairing pixels that always are located at the same coordinates, such as hot or cold pixels. |
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Repairs lines and rectangular regions of pixels that are always located at the same coordinates, such as hot columns, cold traps, and blemishes larger than 1 pixel in area. |
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Creates and edits a blemish mask, which is a text-based description of blemish locations. |
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Detects ands, optionally, repairs transient bad points and regions which vary in position, such as cosmic ray and ionizing radiation events, as well as poorly corrected hot pixels. |
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Used to create a pixel mask by detecting isolated pixels that are very high or very low. |
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Provides a pixel zapping tool used to repair pixels by interactively marking them on an image. |
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Creates and edits a pixel mask, which is a text-based description of x,y locations of bad pixels. |
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Automatically detects and repairs isolated pixels and small clusters of hot pixels as are often caused by cosmic rays and ionizing radiation. |
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Used to remove interfering stars or other point sources from the image. This is typically used before doing photometry on the image. |