There are multiple reasons. The image is iconic, famous and is one of the few true photographic images of Earth. It has also been a featured image since November 2004. Other images may present more detail of the land masses, but they are generally composite or processed images. For some previous discussions see (1234567).
Q.
Why does the article not have mostly harmless as its short description or otherwise summarize the article's content using it?
A.
This has been discussed several times including (12345). The consensus is that it fails WP:42.
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The caption on the main photo of Earth currently reads: "The Blue Marble, Apollo 17, December 1972". The photo used is the color-calibrated version of the Blue Marble, so I think the phrase "color calibrated" should be included somewhere, as all other planet captions mention being in true color, for example Mars. Speaking of Mars, the caption on that article also mentions the landmarks in the photo, so should we mention that in the Blue Marble photo "Africa can be seen, etc."?
Neither of these are necessary. We specify true color because readers are often expecting calibrated color (usually without being explicitly aware of a distinction), so we preempt their confusion. Nothing is miscommunicated, as the reader gets what they expect, and the image serves its purpose perfectly well in illustrating the article. (It is not the goal of this article to explain concepts in photography and optics to the reader, as it is an article about the planet Earth.) As per the landmarks, it's roughly the same idea: most people know what Africa looks like, so we are not ensuring the illustration is adequately explained by explicitly adding that. Remsense ‥ 论23:35, 22 October 2024 (UTC)[reply]
Haven't we discussed this before? My understanding is we use the calibrated version because it is itself the most representative version, and therefore appropriate to represent Earth to an extent a calibrated photo normally wouldn't beRemsense ‥ 论 02:07, 23 October 2024 (UTC) I was totally upside-down about this. These are the times I wish we could lock specific parts of specific articles from editing. Remsense ‥ 论02:11, 23 October 2024 (UTC)[reply]
Hi there, just a question of clarification since I saw the photos get changed. Is the remaster of Blue Marble less accurate than the original? CherrySoda (talk) 03:04, 23 October 2024 (UTC)[reply]
Remsense, what? I'm absolutely shocked that Wikipedia can be so bureaucratic, to the point of blinding themselves with their conviction. It is not certain that the original Blue Marble picture has a more accurate than the recalibrated picture. That's because back then, NASA doesn't care about the true color of planets.
If you have taken a second to look at the description of File:The Blue Marble (remastered).jpg, there is a note that said "The end of most film magazines used on the Apollo missions include a photograph, presumably taken on earth, of a "KODAK Color Control Patch" on a chart containing mission and camera data. This color chart was used to calibrate the above photograph to better approximate real-world colors." Although it might be better that the author linked this in the description, the author also uploaded File:The Blue Marble White Balancing.jpg and linked to the calibration chart he uses to recalibrate the image. This is not original research. This is just adjusting the raw values of a picture with a known reference point. WhatisMars (talk) 20:55, 23 October 2024 (UTC)[reply]
Right, the actual calibration work was original research, based on a synthesis of sources but coming to a conclusion not found in any of the sources. That is a pretty straightforward reading of the policy. Remsense ‥ 论21:00, 23 October 2024 (UTC)[reply]
You're not wrong here, it's just that this is a very special case. Given that the image is so particular, the color grading amounts to a claim in itself; by having a given version we are making a positive claim that it is correct or authoritative, not merely a technical calculation. Remsense ‥ 论21:12, 23 October 2024 (UTC)[reply]
Again, you are misrepresenting me. If you taken a look at the ISS video feed of the Earth, you can clearly see that the ocean doesn't have a deep blue color nor that the vegetation is a dark moss color. Here's two videos of Earth in space: from the ISS and from the Polaris Dawn mission. This might not be the best calibrated picture that we can make, but this is the most faithful to observations made by a regular camera. WhatisMars (talk) 21:19, 23 October 2024 (UTC)[reply]
I understand that, I really do. Like I said, I do not dispute that the calibrated version is what it purports itself to be! It is closer to what the photographer saw with their eyes while capturing the photo. But we are making a claim when we present The Blue Marble specifically: we are using it because it is such an iconic image, which creates this conundrum contrasting with what we normally want to enforce for good reason with MOS:ASTRO. I wish NASA would tweet "hey, good job" about the calibration—that would make this much easier in my mind. I know how silly, particular, and missing-the-point all this probably sounds to you, so I appreciate you engaging with me in good faith about it. Remsense ‥ 论21:24, 23 October 2024 (UTC)[reply]
Thanks for the comment. I appreciate that you are writing your rationale in more detail rather than just handwaving policy pages to the reader, unlike most Wikipedians here. Still, I still disagree with you because the Kodak color chart is designed so that the original color image can be adjusted to the correct, faithful value. This is not a matter of "originality", this is a matter of correctness. In the past, it's virtually impossible to adjust a developed picture in the film so that it would match with the charts and plus this is not a priority of NASA at the time, but now, we have the means to do so. WhatisMars (talk) 21:30, 23 October 2024 (UTC)[reply]
Plus, saying that "NASA would tweet "hey, good job" about the calibration—that would make this much easier in my mind" does not mean that you making an attempt to avoid original research, it just means that you are lazily accepting what the authorities are saying what is true or not. NASA is not the authority about color calibration and they have a poor track record on keeping the planet's color accurate (see this pic for example, where the Sun is orange and Venus's atmosphere is gone). I suggest you to read this blog at [1] to understand why true color is important and why relying on space agencies might not be a good idea. WhatisMars (talk) 21:35, 23 October 2024 (UTC)[reply]
Indeed! I am trying to avoid saying what is true to a considerable degree, as one of our core content policies is verifiability, not truth. It's a real pain much of the time, but it's often our only avenue for constructively building a tertiary knowledge source meant for everyone in the world. Remsense ‥ 论21:38, 23 October 2024 (UTC)[reply]
I don't think that negates any of what I've said above, if you consider the actual reasons and don't defer to a summary checklist. I also think it's rather tendentious to insist on the inclusion of a color-corrected version alongside the original on The Blue Marble: this puts into focus a clear case where color correction is functionally OR and nothing more. Remsense ‥ 论01:28, 7 November 2024 (UTC)[reply]
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The redirect Planet of Water has been listed at redirects for discussion to determine whether its use and function meets the redirect guidelines. Readers of this page are welcome to comment on this redirect at Wikipedia:Redirects for discussion/Log/2024 October 21 § Planet of Water until a consensus is reached. Cremastra (u — c) 01:41, 21 October 2024 (UTC)
Not done: See WP:TRIVIA RudolfRed (talk) 23:18, 16 November 2024 (UTC)
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