File:Rings of Neptune PIA01997.png

Rings_of_Neptune_PIA01997.png (700 × 512像素,文件大小:128 KB,MIME类型:image/png



Credit: NASA/JPL
描述
English: two 591-second exposures of the rings of Neptune were taken with the clear filter by the Voyager 2 wide-angle camera on Aug. 26, 1989 from a distance of 280,000 kilometers (175,000 miles). This PNG was converted from NASA's original TIFF with IrfanView, and differs from NASA's JPG version at File:Rings of Neptune PIA01997.jpg.
ImageMagick's report on difference between NASA's TIFF and NASA's JPG shows distortion:


ImageMagick-6.5.7-Q16\compare.exe -verbose -metric mae Rings_of_Neptune_PIA01997.tif "PIA01997.jpg" PIA01997.TIFFdiffJPG.png
Rings_of_Neptune_PIA01997.tif TIFF 700x512 700x512+0+0 8-bit Grayscale DirectClass 158KiB 0.000u 0:00.006
PIA01997.jpg JPEG 700x512 700x512+0+0 8-bit PseudoClass 256c 69.7KiB 0.000u 0:00.008
Rings_of_Neptune_PIA01997.tif=>PIA01997.TIFFdiffJPG.png TIFF 700x512 700x512+0+0 8-bit DirectClass 288KiB 0.343u 0:00.336
Image: Rings_of_Neptune_PIA01997.tif
  Channel distortion: MAE
    red: 1169.97 (0.0178526)
    green: 1169.97 (0.0178526)
    blue: 1169.97 (0.0178526)
    all: 1169.97 (0.0178526)

ImageMagick's report on difference between NASA's TIFF and derived PNG shows no distortion:


ImageMagick-6.5.7-Q16\compare.exe -verbose -metric mae Rings_of_Neptune_PIA01997.tif "Rings_of_Neptune_PIA01997.png" PIA01997.pngdiffTIFF.png
Rings_of_Neptune_PIA01997.tif TIFF 700x512 700x512+0+0 8-bit Grayscale DirectClass 158KiB 0.000u 0:00.005
Rings_of_Neptune_PIA01997.png PNG 700x512 700x512+0+0 8-bit PseudoClass 61c 128KiB 0.000u 0:00.009
Rings_of_Neptune_PIA01997.tif=>PIA01997.pngdiffTIFF.png TIFF 700x512 700x512+0+0 8-bit DirectClass 160KiB 0.296u 0:00.261
Image: Rings_of_Neptune_PIA01997.tif
  Channel distortion: MAE
    red: 0 (0)
    green: 0 (0)
    blue: 0 (0)
    all: 0 (0)

日期
来源 [1] from Catalog Page for PIA01997, converted to PNG with IrfanView
作者 Voyager 2, NASA/JPL
其他版本
Original Full-Res TIFF from NASA
Original Full-Res JPEG version from NASA


Public domain 本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zhNASA版权方针页面JPL图片使用方针。)
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当前2009年8月22日 (六) 19:472009年8月22日 (六) 19:47版本的缩略图700 × 512(128 KB)84user{{Information |Description= {{en|1=two 591-second exposures of the rings of Neptune were taken with the clear filter by the Voyager 2 wide-angle camera on Aug. 26, 1989 from a distance of 280,000 kilometers (175,000 miles). }} |Source=[http://photojou

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