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1. Calibrating the Array
Calibrating an array is similar to zeroing a balance when nothing is on it. If an array is not calibrated, the data will be completely distorted,
rendering it unusable. The image on the right was produced with uncalibrated data. The left-hand image was computed from calibrated data.
2. Creating a Basic Image
In this computationally-intensive step, raw data is converted into a form that can be used to produce images. After conversion, astronomers
can use advanced graphics sofware to produce images. The above picture shows a rough image of the
active galaxy, Cygnus A, produced at this stage. Notice all
the yellow areas that tend to obscure the object's key features.
Return to Insight Through Images
Up to Computers: The Image Forming Elements