Image: Rings of Neptune PIA01997

Description: 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.

.mw-parser-output .tpl-hidden{clear:both}.mw-parser-output .tpl-hidden>.mw-collapsible-toggle{float:none}.mw-parser-output .tpl-hidd:before{display:none}.mw-parser-output .tpl-hidden.mw-made-collapsible>.mw-collapsible-toggle>.tpl-hidden-arrowtoggle{padding-left:20px;background-image:url("https://upload.wikimedia.org/wikipedia/commons/1/10/MediaWiki_Vector_skin_action_arrow.png");background-position:left 50%;background-repeat:no-repeat}.mw-parser-output .tpl-hidden.mw-made-collapsible.mw-collapsed>.mw-collapsible-toggle>.tpl-hidden-arrowtoggle{background-image:url("https://upload.wikimedia.org/wikipedia/commons/4/41/MediaWiki_Vector_skin_right_arrow.png")}.mw-parser-output [dir=rtl] .tpl-hidden.mw-made-collapsible.mw-collapsed>.mw-collapsible-toggle>.tpl-hidden-arrowtoggle{background-image:url("https://upload.wikimedia.org/wikipedia/commons/1/1e/MediaWiki_Vector_skin_left_arrow.png")} 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)     gre 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)     gre 0 (0)     blue: 0 (0)     all: 0 (0)
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