File:Indian Head interlace.gif

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Indian_Head_interlace.gif (576 × 384 pixels, file size: 54 KB, MIME type: image/gif, looped, 2 frames, 0.1 s)

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English: Demonstration of interlace and so-called "interline twitter", based on part of an RCA Indian Head Test Card ca. 1940. From left to right: progressive, interlace animation, and reconstructed using "bob" (interpolation per field) algorithm. Top row: original full-resolution image; bottom row: vertically blurred using [1 4 6 4 1]/16 kernel. Progressive images are darkened somewhat to match the effective brightness of the interlaced images.
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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Interlaced, animated, retouched, and blurred. The original can be viewed here: RCA Indian Head test pattern.JPG: . Modifications made by Damian Yerrick.


This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.

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This image is a derivative work of the following images:

  • File:RCA_Indian_Head_test_pattern.JPG licensed with PD-US-no notice
    • 2009-06-10T21:43:10Z Multixfer 1024x768 (418986 Bytes) Better resolution
    • 2007-10-04T21:10:13Z Night Ranger 330x251 (25785 Bytes) {{Information |Description=Source: http://www.high-techproductions.com/testpatterns.htm |Source=Originally from [http://en.wikipedia.org en.wikipedia]; description page is/was [http://en.wikipedia.org/w/index.php?title=Image%

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Date/TimeThumbnailDimensionsUserComment
current14:53, 16 August 2009Thumbnail for version as of 14:53, 16 August 2009576 × 384 (54 KB)Damian Yerrick (talk | contribs){{Information |Description={{en|Demonstration of interlace and so-called "interline twitter", based on part of an RCA Indian Head Test Card ca. 1940. From left to right: progressive, interlace animation, and reconstructed using "bob" (interpolation per fi

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