Editing Talk:2414: Solar System Compression Artifacts
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:tl;dr?<span> β [[User:Sqrt-1|The <b>π¦πΎπΏπ-π</b>]] <sup>[[User talk:Sqrt-1|<span style="color: blue">talk</span>]] [[Special:Contributions/Sqrt-1|<span style="color: blue">stalk</span>]]</sup></span> 13:16, 21 January 2021 (UTC) | :tl;dr?<span> β [[User:Sqrt-1|The <b>π¦πΎπΏπ-π</b>]] <sup>[[User talk:Sqrt-1|<span style="color: blue">talk</span>]] [[Special:Contributions/Sqrt-1|<span style="color: blue">stalk</span>]]</sup></span> 13:16, 21 January 2021 (UTC) | ||
::TLDR is this Tom Scott video on the topic: https://youtu.be/h9j89L8eQQk. Short version: the difference between blacks #010101 and #020202 (a doubling of brightness) is more noticeable than the difference between whites #FEFEFE and #FDFDFD (a 0.00001% change in brightness). If your picture is dark, and especially if it is compressed, you will often get ugly bands of different shades of black. [[Special:Contributions/108.162.237.28|108.162.237.28]] 16:50, 22 January 2021 (UTC) | ::TLDR is this Tom Scott video on the topic: https://youtu.be/h9j89L8eQQk. Short version: the difference between blacks #010101 and #020202 (a doubling of brightness) is more noticeable than the difference between whites #FEFEFE and #FDFDFD (a 0.00001% change in brightness). If your picture is dark, and especially if it is compressed, you will often get ugly bands of different shades of black. [[Special:Contributions/108.162.237.28|108.162.237.28]] 16:50, 22 January 2021 (UTC) | ||
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I would suggest that more emphasis needs to be placed on 'dynamic range' and 'undetectable' in this explanation. Particularly noticeable in streaming video codecs, you often can't decipher any information in dark scenes/regions. So the joke is that the map beyond here is empty, mostly because it is too far down in the dynamic range of our lossy observations. [[Special:Contributions/108.162.219.80|108.162.219.80]] 17:36, 21 January 2021 (UTC) | I would suggest that more emphasis needs to be placed on 'dynamic range' and 'undetectable' in this explanation. Particularly noticeable in streaming video codecs, you often can't decipher any information in dark scenes/regions. So the joke is that the map beyond here is empty, mostly because it is too far down in the dynamic range of our lossy observations. [[Special:Contributions/108.162.219.80|108.162.219.80]] 17:36, 21 January 2021 (UTC) | ||
:Re "...stretches out over maybe a dozen such low-res pixels/AUs, which is equivalent to slightly more than the radius of Saturn's orbit or the entire diameter of Jupiter's!", this assumes that Jupiter and Voyager are the same distance from the imaginary "camera". I can completely cover the moon with my thumb, but that does not imply that they are similar in size, because my thumb is closer to my eye. ''(Unsigned!)'' | :Re "...stretches out over maybe a dozen such low-res pixels/AUs, which is equivalent to slightly more than the radius of Saturn's orbit or the entire diameter of Jupiter's!", this assumes that Jupiter and Voyager are the same distance from the imaginary "camera". I can completely cover the moon with my thumb, but that does not imply that they are similar in size, because my thumb is closer to my eye. ''(Unsigned!)'' | ||
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I'm not sure dithering would be a useful way to dispel the banding, since dithering would increase the compressed data size because you no longer have large areas of all-the-same-pixel-value. | I'm not sure dithering would be a useful way to dispel the banding, since dithering would increase the compressed data size because you no longer have large areas of all-the-same-pixel-value. | ||
The banding could also be an artifact of the decompression. If you consider that a format like JPEG uses something like Fourier transforms it seems it should be able to represent a gradation easily and the stepped banding with difficulty, so I might be tempted to blame the banding on the decompression code.[[Special:Contributions/108.162.241.70|108.162.241.70]] 13:46, 22 January 2021 (UTC) | The banding could also be an artifact of the decompression. If you consider that a format like JPEG uses something like Fourier transforms it seems it should be able to represent a gradation easily and the stepped banding with difficulty, so I might be tempted to blame the banding on the decompression code.[[Special:Contributions/108.162.241.70|108.162.241.70]] 13:46, 22 January 2021 (UTC) | ||
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== Source of Voyager 1 == | == Source of Voyager 1 == | ||
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One more point: I think this XKCD is a play on the fact that every few years we hear once again that "Voyager has left the solar system". First because it passed the termination shock, then because it passed the heliopause. [https://solarsystem.nasa.gov/news/784/nasas-voyager-2-probe-enters-interstellar-space/ This article from NASA] says that Voyager won't be officially out of the solar system until it passes the Oort cloud. These milestones seem arbitrary, so why not make up one more? [[User:Efalk|Efalk]] ([[User talk:Efalk|talk]]) 17:13, 24 January 2021 (UTC) | One more point: I think this XKCD is a play on the fact that every few years we hear once again that "Voyager has left the solar system". First because it passed the termination shock, then because it passed the heliopause. [https://solarsystem.nasa.gov/news/784/nasas-voyager-2-probe-enters-interstellar-space/ This article from NASA] says that Voyager won't be officially out of the solar system until it passes the Oort cloud. These milestones seem arbitrary, so why not make up one more? [[User:Efalk|Efalk]] ([[User talk:Efalk|talk]]) 17:13, 24 January 2021 (UTC) | ||
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