TE
科技回声
首页24小时热榜最新最佳问答展示工作
GitHubTwitter
首页

科技回声

基于 Next.js 构建的科技新闻平台,提供全球科技新闻和讨论内容。

GitHubTwitter

首页

首页最新最佳问答展示工作

资源链接

HackerNews API原版 HackerNewsNext.js

© 2025 科技回声. 版权所有。

Photographic Reference Scale (2019)

99 点作者 mattowen_uk将近 4 年前

9 条评论

peterhil将近 4 年前
This seems very handy – however the reference image would be infinitely easier to print on the correct size if it was a PDF file. PNG image format does not retain the resolution IIRC.
评论 #27917769 未加载
评论 #27917756 未加载
traceroute66将近 4 年前
Its all very well saying &quot;here&#x27;s a free photographic reference, download it and print it&quot;. But I worry about the lousy job your average cheap home inkjet printer will do of getting it onto paper.<p>Some things are just better bought from a reputable manufacturer than bodging your own. Photographic reference charts may well be one of them.
hatsunearu将近 4 年前
Printing middle grey with an uncalibrated printer is uh... kinda meaningless.<p><a href="https:&#x2F;&#x2F;smile.amazon.com&#x2F;WhiBal-White-Balance-Pocket-Card&#x2F;dp&#x2F;B004G3NW5M&#x2F;" rel="nofollow">https:&#x2F;&#x2F;smile.amazon.com&#x2F;WhiBal-White-Balance-Pocket-Card&#x2F;dp...</a><p>I&#x27;ve been using this for my photo adventures; I try to keep it in my wallet at all times (I worry about it getting discolored by rubbing against other cards though) and whenever I notice that the white balance is gonna get fucky (esp when there are multiple light sources) I whip that out and take a picture of it in the same scene.<p>edit: Also people love to use grey cards for getting exposure right but it&#x27;s complete bunk science; if you&#x27;re using the raw workflow (if you&#x27;re fine tuning white balance you almost definitely are) you should shoot as bright as practically possible and not too bright to prevent clipping and adjust exposure as you see fit in editing.
评论 #27919993 未加载
评论 #27919710 未加载
评论 #27919354 未加载
doodlebugging将近 4 年前
I was scanning satellite photos yesterday and came across what I think are ground reference points built to enable determination of exact ground distances using a series of concentric rings and oriented linear features. I believe knowledge of the exact diameter of the rings and length of the chords would allow a user to measure features in the photo with acceptable precision.<p>I know that early pilots had a series of markers that they could use to keep themselves on track as they flew their long distance routes. These things were oriented concrete markers, some of which are still accessible.<p>We all need a reference, a way to cross-check or ground truth our results and conclusions.
dcminter将近 4 年前
After reading this article I noticed the reference on this BBC article: <a href="https:&#x2F;&#x2F;www.bbc.com&#x2F;news&#x2F;science-environment-57853537" rel="nofollow">https:&#x2F;&#x2F;www.bbc.com&#x2F;news&#x2F;science-environment-57853537</a> (first picture)<p>Though I note that that one looks suspiciously like the contra-recommended laser printed output.<p>Baader-Meinhof phenomenon - or did reading that Beeb article inspire someone to find and post this one?
iseanstevens将近 4 年前
Thanks, this is handy.<p>I’ve done some little experiments but having a standard-ish thing is better.<p>Would this integrate to give scale, in say, Meshroom? Or it’s manual calibration step someplace along the workflow?<p>I’m in it more for the reasonably accurate 2d&#x2F;3d measurements, but approximately accurate color is nice as well.
snoopen将近 4 年前
I&#x27;m curious if there are any good methods for correcting lens distortion. Like can I print a poster, take a photo and use that to create a correction map?
评论 #27919154 未加载
评论 #27919885 未加载
mrichards212a将近 4 年前
Does anyone know of an opencv which can be used to calibrate calibrate using something like this?
neolog将近 4 年前
Is a single gray really enough to calibrate color?
评论 #27918297 未加载
评论 #27916594 未加载
评论 #27917218 未加载