A Processing technique for displaying and

Printing High Resolution Astro images

Uploaded 8/29/04

 As I soon discovered with digitized film images take with my schmidt camera or wide angle lenses, there are far more stars in an image than is possible to display with an inkjet print with its often horrendous halftone dithering, or especially on my "high resolution" 19 inch monitor either full screen or web site sized especially. By using the dilation filter in Pix Insight, stars can be increased in size slightly without an loss of brightness such as a Gaussian blur would do. This allows even the faintest stars to be printed on such a small print as an 8x10, or viewed on an even lower resolution monitor image. Here is an example of this effect:

 Left: 30 second exposure, on ASA 100 film of Sagittarius during full moon. The stars are so tiny even with this 1024 wide image, that 90 percent of them are invisible!

(click on thumbnail for the full size image)

 Left: after Pix Insights dilation filter (similar to Photoshop Maximum filter) A small amount of star enlargement reveals the faintest stars. You don't want to make them huge disks - set for a very small amount of dilation, such that the stars are all still extremely small pinpoints.

(click on thumbnail for the full size image)

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