Marc Levoy - Lectures on Digital Photography - Lecture 1 (21mar16).mp4
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- čas přidán 23. 08. 2024
- This is one of 18 videos representing lectures on digital photography, from a version of my Stanford course CS 178 that was recorded at Google in Spring 2016. Links to all 18 videos, my slides (in PDF form), and the course applets and assignments are on the Schedule page of the course web site: sites.google.co...
For convenience, here is a playlist of all 18 lectures, in order: • Lectures on Digital Ph...
Note that the quality of the audio is poor in this lecture (#1) due to an inferior microphone; subsequent lectures have better audio.
Regarding captioning and translation, all of the lectures have auto-captioning enabled. This also enables auto-translation if you switch the captioning language. The quality of this captioning is uneven, and is probably poor in lecture #1 due to its inferior audio quality. People are welcome to help me by captioning these lectures - in English or whatever language they speak!
To help caption this lecture, follow this link: www.youtube.com...
To help caption all of these lectures, follow this link: www.youtube.co...
Finally, I apologize for being unable to field the many good technical questions these lectures are generating, including many that I am receiving through other channels. Given my day job at Google, I simply cannot afford the time. I am sorry!
Here is a playlist of all 18 lectures, in order: czcams.com/play/PL7ddpXYvFXspUN0N-gObF1GXoCA-DA-7i.html
Thank you, just bought a Canon DSLR. This is extremely helpful. I'm grateful!
please provide the pdfs for lectures
thanks
As the caption for the video says, the PDFs of the lecture slides are on the course web site: sites.google.com/site/marclevoylectures/schedule
Update on September 7, 2016: the video for lecture #5 has been edited to remove copyrighted content (a short snippet of Alfred Hitchcock's The Birds), and re-uploaded. If people have created playlists of these lectures, they should update them accordingly.
Could you list the referenced books in the show more area, thanks!
I feel like the first person to find Gold during the gold rush in the US
God damn this is a gold mine of information. THANK YOU
As a computer vision practitioner and photography enthusiast, I must say this course has just the optimal balance of content. I watched all the lectures as if they were a TV show, always trying to imagine how the next topic would be presented. Thank you so much, Prof. Marc Levoy! Very inspiring work.
Im only about 50min into this lecture but I just want to thank you, Marc, for uploading this. I definitely have a new appreciation and totally different perspective of the camera and photography. Again, thanks a bunch for these lectures
*Appreciated that you haven't put an ad in the whole video*
He work with google
I've watched all the videos in this great series. One aspect I really enjoyed, being a scientist myself, is Marc's open-minded attitude and willingness to be corrected and informed by others in the audience, as contrasted by the all-too-common stance of "I'm the expert here, trust me". It exemplifies one of the many pleasures of being in science.
I cannot express how grateful I am that you have shared these lectures. Finally having the the "Why" behind the "How" after decades of studying photography is exciting. Your series should be subtitled "The Missing Lectures" since you provide the science, formulas, and explanations unavailable from every other source I have ever found. I am eager to pour over each installment in your entire series. Thank you, Marc Levoy!
You remind me so much of my favorite teachers. Knowledgeable, enthusiastic, and inspiring :D
edit - And you have way better slides!
thank you so much for putting this online :) spreading knowledge is always great :)
3:21 Syllabus
5:08 Recommended books
6:13 Items needed for assignment completion
7:17 Reading for the week
7:40 Lecture begins
8:21 Laws of perspective
9:15 Natural perspective
12:15 Linear perspective
17:00 Alberti's explanation of Linear perspective
20:23 Vanishing points
30:50 Single lensa reflex camera
31:04 Do Camera's need lenses? What happens if you take a sensor and put it up in the open?
31:45 Pin hole camera (2D planar geometric projections)
35:07 Shortcomings of a pinhole. Lens do the same thing, but better?
36:29 Geometric optics
37:30 how lenses invert image. Inverted image is made behind the focal point
I have just watched 30 mins and I already realised this is gold! I just wanted to know a little bit more about photography (though it's not my field, but it's related), but everything he says is so interesting. Thank you!
Seriously, who could dislike these videos? It's awesome.. thanks a lot for sharing!
awesome! It's heat warming to have educators and enthusiasts, who share their 'magic' with the rest of us. Pass it on folks....pass it on
Deaf Filipino students/workers believed and thankful to Marc Levoy for online completely free.
Thank you very much Marc for sharing your knowledge with the world. The content is very instructive and inspiring. Greetings from the Grand Duchy of Luxembourg. Jerry.
Thank you for posting this online for everyone Mark.
Hi Marc! Thank you so very much for this course. You have no idea what this mean for a guy like me who's always wanted to attend a course like this one. Much love brother!
I really appreciate this sharing! I'm a photog & HS science teacher with a geology major, and tons of interests regarding art composition. It's my goal someday in the small rural HS I teach in to eventually teach photography for HS credit. I have been reading so many technical manuals for years on this stuff. How wonderful to find it all wrapped up in a package like this!
Thank you so much for this wonderful service Professor Levoy
I'm so thankful for your plethora of knowledge and willingness to share.
Mabuhay! Thank you Sir, this is very helpful, i'm new to photography and this lectures will be a big help. From Manila, Philippines.
I came across your video today and I want to say thank you for it.
Thank you for sharing so much knowledge! great lectures, still on the first one and already i fell in love with this course. This coming from someone who already has profesional experience as a cinematographer/photographer. Again thank you for sharing this with the world.
Who else went out and bought a Nexus 6p in 2019 because of this course?
I think the gentleman asking about the nikon electronic shutter is referring to global shutter. Both rolling and global shutters are electronic. The mechanical shutter is just there to ensure the part of the sensor that has been activated electronically is exposed only and no other light diffractions are there. At least that's how I think it works. The reason global shutters have not picked up fast is the sheer data that needs to be written to cards (16-bit RGB RAW) when all data comes at once. The buffer size of cameras are picking up steadily so I expect this to change.
thank you for sharing it with the world. Greetings from France
Thank you! Greetings from Bulgaria! :)
really good course, finding it a bit hard to keep up with the formulas and technical stuff, my mind doesn't seem to work that way. lets see if its bit above me or not.
Thank you for this contribution to society, it is very much appreciated!
¡Muchas gracias por los subtítulos en español!
Thank you very much for putting them online
Thanks a lot Professor !! I was not aware of perspective view before. Architecture knowledge can aid in photography :). Thanks for sharing the knowledge for free . Appreciate it very much.
Love the series, thank you! Just one comment on this lecture at 51:10 the caption over the portraits mentions Effect of focal length on portraits. But it is really showing the effect of distance. If the wide angle lens was backed up to the same distance as the telephoto the perspective (facial features) would be the same. Of course the face would be much smaller in the frame, so that isn't practical or image quality. But it is the distance from camera to subject that is causing the effect on the size of the nose, not the focal length of the lens.
Well that or it could be the fact that when the distance is increased, the subjects fall more and more towards the center part of the frame which is out of distortion in all cases. That is why distortions on the person is reducing.
At an hour in Mr. Levoy talks about the 1912 picture "Grand Prix" by Jacques-Henry Lartigue.
There's a nice little piece about the picture with a video of how the shutter worked for anyone interested: www.gobelluno.it/2014/12/02/la-velocita-nel-1912-grand-prix-de-la-c-f/
Thanks a lot for sharing such excellent technical information. I have just gone back to my college days learning about 2d animation drawing classes when i am with Perspectives :) but it just helped me again to recollect those very important points to keep in mind.
I have enjoyed the video I've watched so far, and look forward to the rest of the series. As others have noted, it is often hard to hear the speaker. I think this is because, when he is speaking towards his right, he is facing away from the mic, which is on the left side of his open shirt. This could in principle be solved by making a transcript, an amount of work that is not likely to be done! The other issue is hearing the audience questions; this could easily be solved if the speaker repeats the question. I'd like to suggest that, if these are ever taped again, the questions be repeated and that he takes care to speak directly into the mic.
Thanks for what looks like a very informative series!
Fixed in later lectures
Thank you for sharing such high quality courses. I learned a lot. I found many answers here and some contents may be difficult if impossible to find elsewhere. I shared the link to the 18 lectures on facebook.
The Human eye is essentially a camera obscura. The pupil being the pinhole.
Thanks heaps for these.
Thank you very much for the wonderful lectures, and more so the upload!
I feel like a student again. Thank you! :-)
This is great! I'm so grateful for this content
I have a question about the focal lengths of lenses for micro 4/3rds that you mention in an answer at ~54.11 minute mark. You mention that the micro 4/3rd lens is 14-45mm. And that this needs to be multiplied by 2 which gets the 28-90mm.
My understanding based on what I have read up online before is that focal length of a lens doesn't change irrespective of the sensor size since it is the actual distance between the sensor and the lens. What changes instead is the equivalent field of view. So the 14-45mm lens on the micro 4/3rd sensor has the equivalent field of view as a 28-90mm lens on a full frame 35mm sensor.
I apologize if you have addressed this issue either later in this lecture or one of the following lectures.
Having been into photography for a few years now, I am really enjoying the technical side of this lecture and am having a lot of "Ahaa.. Now that totally makes sense now!" moments.
My only gripe is with regards to the low audio in certain sections as mentioned by a few of the other folks as well.
Thank you for being so generous.
Thank you so much for sharing this!!!
One question though - is there any chance it might get close-captioned? Especially the questions from the in person students are mostly inaudible. There's a point about an hour in where someone points out an error on the slide, and we could hear your reaction to it but not what the error was.
If you can't hear questions from the in-person students, then neither I think would whoever we hired to add close captioning. Anyway, Googlers from remote offices pointed this problem out to me, and I tried to correct it in later lectures by repeating questions aloud. Sorry about that!
Thanks... and I found the slides on your website which presumably have the correction that was mentioned. You can make out some of the questions by cranking up the volume but not all of them. Also there are auto-captions provided by CZcams which pick up some of the semi audible questions.
The mistake on the slide is that it states: "shortest exposure is 1/f", when in fact it should state that the LONGEST exposure is 1/f. The smaller the fraction the longer the exposure. e.g: 1/4 of something is bigger than 1/20 of something.
11:54 them pictures are in desperate of some camera RAW tuning up !!
I found this after watching the Pixel 4 event.
Enjoying my Pixel 4 and finding this lecture series.
Subject looks to be good. The drawings and and voice have to be improved a lot. Normal ear phones are not good enough for this audio. Thanks professor. As a disability activist, I hope u include accessibility features too.
CZcams auto-captioning should be available on all lectures, in multiple languages.
You rock professor Levoy !
tried falling asleep to this but a student coughed in my left ear and scared the crap out of me
I Pray for you Sir!
It's so Nice..
Thank you Sir!!
From India & Saudi!
Regards
I don't own a Camera but kinda passionate in photography. Is it worth watching for me without having a cameras???
Its more like conceptual stuff in here you know. I dont think you need a camera to grab this all. But a bit of knowledge about camera or having a phone camera which you can control manually would make it easy.
There is no way in hell that you can call yourself passionate about photography and not own a camera.
Oh my god. Everything makes sense now. Thank you!
Thank Professor from Benin (Afrika ) !
Until 39:00 everything was perfect. Gauss ray well explained, with the ray converging to a focal point then create the image on a plane behind. Then starting 39:12 everything is confusing, the focal point become the image plane. Please help me understand this, I searched at least 20 books without finding a solution. Could you give us a book title to read, thank you again Marc, have a nice end of day.
Don't think of a "focal point". Rays from nearly any point to the left of the lens (in object space) will converge to *some* point to the right of the lens (in image space). If the rays are coming from infinity (i.e. parallel rays), then the point they converge to in image space is one "focal distance" from the lens, where that distance is a fixed property of the lens. Equivalently, if you move the sensor, and ask which rays in object space will, when bent by the lens, converge to a point at that moved distance in image space, there will be such a point. The formula relating these two so-called conjugate points is the Gaussian Lens formula. A good textbook is Hecht's Optics.
struggling here but thank you for sharing - greetings from Jakarta Indonesia
Found the terrible audio annoying, especially when people asked questions. If I can't hear the question, then the answer is irrelevant to me in a way. Great information included here, but I hope the audio improves in the other lectures.
Thank you. These lectures are great.
Mr. Levoy, will a cropped sensor camera like nikon d3100 affect the aperture just like focal length? I mean, do we multiply like say f4 by 1.5 to get the real aperture ?
Thank you Marc. Much appreciated.
Thank you sir
Hello, Mr. Levoy. Would you also recommend the 9th or 8th editions of Photography book by London, Stone and Upton? The newer versions seem overpriced. Thank you.
Perfect i want to say thanks more than 1000 times for ur videos Thanks a lot 😍😊😉
Thank you for sharing. Precious.
Hi, does anyone know why multiplying the number of blurred pixels results in the required minimum shutter speed to freeze the moment?
Quiero subtitulos en español, por favor. Me interesa mucho.
Hey @Marc Levoy. Would this lecture be worth it for a student of filmmaking? This would primarily be as a study in technical cinematography and not as still images. I would think it would be applicable since lenses and cameras are the same.
Hello, could someone tell me how to translate it to Spanish ? ... Appreciate it because I am very interested to learn about photography direction through these classes. Thank you :)
study English, translate it yourself, spread the love!
Thank you for sharing this !!!
Regards from France.
That Nexus product placement tho :D
still very good and interesting lecture!
All I can say is, thank you!
Thank you Sir ! Olivier from France
thank you for sharing this course!
Thanks so much for this videos but please could you fix the Spanish subtitles?? 🙏🙏.. I don't have a good English 😅
The sound is sometimes muted sometimes loud.
That would be because he is wearing a mic and sometimes he is facing it and sometimes he is not.
That problem only occurs on lecture #1. It was fixed for later lectures. Sorry about that!
Marc Levoy no worries! Thank you for putting these up. The community is incredibly lucky to have someone like yourself so giving.
I enabled subtitles to make easier to understand, if it helps for some people
This is great!! Thank you for sharing
Thank you for giving!
What is the first book he mentions in the beginning of the lecture right before "Learning to see creatively"??
London, Stone, and Upton, Photography. See the reading list at: sites.google.com/site/marclevoylectures/schedule
Thanks for sharing. May I ask where can I find the slides for the lecture?
At 1:05:38 you mentioned by counting the number of blur pixel on her finger (which you mentioned it is 5 pixel here), we can figure out the requited shatter speed.
My question is, how we can count the number of blur pixel?? :)
What I meant was counting the span of pixels between the left and right side of the motion blur of her hand. This distance, together with the image resolution and the shutter speed, allows you to calculate the speed at which her hand was moving.
i'm here today after found out that he left google
MAAAAAAAAAAAAN !! where were those courses before ?? Thank you so much
Thank you. Really appreciate.
Thank u so much definitely going to uni to do photography
THANK YOU THANK YOU THANK YOU
Can someone tell me if i can find this videos with subtitles in spanish somewhere?
Thank you sir!
Many thanks ~
Thanks, Marc! Would you mind adding the book titles and authors to your description?
I'm not sure which books you are referring to, but the books required for the Stanford version of the course are listed in the course schedule, which is here: sites.google.com/site/marclevoylectures/schedule
58:00 Leaf shutters is slow? You mean old type leaf shutters I guess? I thought leaf shutters is fast. For example, Fujifilm can freeze flash photography up to 1/4000s with leaf shutter on a modern camera, without need of "High Speed Sync". 1:09 Just adding info. If you lock mirror up, it becomes a full electronical shutter on dSLR in most cases.
Sync speed isn't the same thing as maximum shutter speed. Leaf shutters tend to have a lower shutter speed than focal plane shutters. They can achieve higher sync speeds because of the interaction of how long the flash impulse lasts and the mechanics of how the shutter closes.
Here's a pretty good explanation of sync speed:
fstoppers.com/originals/demystifying-high-speed-sync-68527
you still have to open and close "curtain", dont you?
Hey Marc, I have a minolta srt 101. Do you like it?
Since the sites.google.com site seems to have some bandwidth limits and the lectures are here on youtube as well, maybe add links to youtube on that page so people can find them more easily when the maximum has been reached?
Unfortunately, some of the lecture videos have copyright violations, so linking to CZcams is not a perfect solution.
At Stanford I'm protected by fair use, but CZcams doesn't know about fair use.
I'm trying to remove the copyrighted material, which is incidental to the lecture.
I'm also asking Google for a workaround to the bandwidth limits (I work for Google).
Since I'm watching the videos on CZcams does that mean I'm missing some of them? If so which ones?
Go to marclevoy.org for the full set.
Thank you so much...
Thaank you for sharing. Greetings from Malaysia! :D
Thank you so so much!
let's do this!
Sir you are great
so good ! thanks a lot !
Thank you for share!
---From Taiwan