File:Comet Hale-Bopp (eso9521c).tiff
Size of this JPG preview of this TIF file: 703 × 599 pixels. Other resolutions: 282 × 240 pixels | 563 × 480 pixels | 908 × 774 pixels.
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editDescriptionComet Hale-Bopp (eso9521c).tiff |
English: This image was produced through successive use of photographic enhancement and subtraction, followed by smoothing by computer processing . When a matching, earlier exposure of the same sky field with the same telescope (on which the comet is not present) is photographically subtracted from the enhanced photo of the same field in which the comet is present, then the images of the stars should in principle cancel out, leaving only that of the comet in the field. A full cancellation is virtually impossible to achieve in practice, but if the resulting image is heavily smoothed (i.e. substituting each image element with the mean intensity of its surroundings), then the smaller images of the stars disappear and the full extent of the comet's large coma becomes visible. This false-colour photo was produced in this way by means of computer processing within the MIDAS image processing system. The images of the brightest stars could not be completely removed by this process and faint remnants are still present. (In technical terms, a 2-D low-pass Fourier filter was used to achieve heavy smoothing over approx. 16 x 16 arcsec cells). |
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Date | 30 August 1995 (upload date) | ||
Source |
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Author | ESO | ||
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editThis media was created by the European Southern Observatory (ESO).
Their website states: "Unless specifically noted, the images, videos, and music distributed on the public ESO website, along with the texts of press releases, announcements, pictures of the week, blog posts and captions, are licensed under a Creative Commons Attribution 4.0 International License, and may on a non-exclusive basis be reproduced without fee provided the credit is clear and visible." To the uploader: You must provide a link (URL) to the original file and the authorship information if available. | |
This file is licensed under the Creative Commons Attribution 4.0 International license.
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current | 22:41, 14 June 2024 | 908 × 774 (190 KB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://www.eso.org/public/archives/images/original/eso9521c.tif via Commons:Spacemedia |
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Image title | This image was produced through successive use of photographic enhancement and subtraction, followed by smoothing by computer processing . When a matching, earlier exposure of the same sky field with the same telescope (on which the comet is not present) is photographically subtracted from the enhanced photo of the same field in which the comet is present, then the images of the stars should in principle cancel out, leaving only that of the comet in the field. A full cancellation is virtually impossible to achieve in practice, but if the resulting image is heavily smoothed (i.e. substituting each image element with the mean intensity of its surroundings), then the smaller images of the stars disappear and the full extent of the comet's large coma becomes visible. This false-colour photo was produced in this way by means of computer processing within the MIDAS image processing system. The images of the brightest stars could not be completely removed by this process and faint remnants are still present. (In technical terms, a 2-D low-pass Fourier filter was used to achieve heavy smoothing over approx. 16 x 16 arcsec cells). |
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Width | 908 px |
Height | 774 px |
Bits per component | 8 |
Compression scheme | LZW |
Pixel composition | Palette |
Orientation | Normal |
Number of components | 1 |
Number of rows per strip | 9 |
Data arrangement | chunky format |
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