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File:Kcc rescale 06 im default.jpg

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Kcc_rescale_06_im_default.jpg (557 × 425 pixels, file size: 73 KB, MIME type: image/jpeg)

Summary

Description
English: Part of a series of images to compare and contrast the levels of spatial aliasing that can result when an image that contains some strong spatial frequencies is digitally rescaled. An image of an 1801 engraving of King's College Chapel, Cambridge was used as a test object, and resized to 50% using different filters and different programs.

The image on this page was resized to 50% using Image Magick 6.7.5 with no option specified -- this defaults to a Mitchell filter in this release of the program.

In this case the Mitchell filter appears to give a result that is a little sharper than the IM triangle filter, but a little softer than the IM Lanczos filter. However, sometimes it is possible that the Lanczos sharpening may itself be an artefact.
Date
Source This file was derived from: F. Roffe after P. Nash (1801) - King's College Chapel - sanders13001.jpg
an engraving first published in 1801.
Author John Roffe (1769-1850), engraver, after Frederick Nash (1782–1856)
Other versions

Source code

 convert kcc.jpg -resize 50% kcc_im_default.jpg

Licensing

This is a faithful photographic reproduction of a two-dimensional, public domain work of art. The work of art itself is in the public domain for the following reason:
Public domain

This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.

You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.
The official position taken by the Wikimedia Foundation is that "faithful reproductions of two-dimensional public domain works of art are public domain".
This photographic reproduction is therefore also considered to be in the public domain in the United States. In other jurisdictions, re-use of this content may be restricted; see Reuse of PD-Art photographs for details.

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Date/TimeThumbnailDimensionsUserComment
current19:09, 6 March 2012Thumbnail for version as of 19:09, 6 March 2012557 × 425 (73 KB)Jheald

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