What is Gamma Correction? - Video Tech Explained

[@adityams1659]

*Someone get this dude a medal!*

[@Dstonephoto]

I cannot imagine how much work went into researching and condensing all of this. Thank you for doing this. Dope explanation. It’s surprisingly hard to find comprehensive information on this topic. You have the magic touch!

[@gespertino]

Hi. I love your videos, you put a lot of work on them and they are very concise and informative. However, there is a fundamental mistake in this one you probably might want to revisit. Gamma correction is a curve applied to "cancel" the curve from a gamma-encoded image. Our non-linear perception is the reason for the encoding, not the correction. We want to see the images in ratios as close to the ratios present in the capture image as possible. And that means that our eyes will have to receive light in the same ratios the camera "saw". If all digital images were 32-bit float images, gamma correction wouldn't exist, as cameras would capture and store linearly, and displays shouldn't have to apply any curve to them. But since we're still using 8-bit integer images a lot, computers need a way to store them in that precision. Linear won't cut it, because of our non-linear perception: our eyes are more sensitive to shadows, and 128 levels of brightness for the darker parts of the image won't be enough to represent a smooth gradient, you'll se a lot of banding. So, images have to be accommodated to allocate more bitdepth for the shadows, leaving less precision for lighter parts, the ones we have less sensitiity to. That's gamma encoding, and that's the bending gamma correction cancels. You have all the pieces there in your video, but the leading idea is unfortunately wrong

[@gespertino]

And to address the question: "why linear images look wrong when displayed directy" that most of the people reading this might have at this point, the answer is simple: Monitors are applying a gamma-correction automatically, but since the images not gamma-encoded (when you dump linear to the display) you end up looking at a non-linear image.

[@jarkkolaiho462]

Very well done. Every other gamma curve explanation I've seen has neglected some aspect (capture tech, display tech, human eyesight) of the gamma curve topic, so definitely learned some new stuff here today.

[@Daniel_WR_Hart]

One of them made a graph and got the x and y axes mixed up lol

[@entropydefined2651]

This was the most concise and understandable explanation of what gamma actually is and does. Thank you for not over complicating it!

[@petermeinhart3735]

your work is insane, I'm in this rabbit hole for quite a while and your videos help so much!

[@RuminInLove]

Awesome video, got more here in 8 minutes than I ever could in hours on various forums talking about gamma.

[@averinmarkstroem8577]

Great job dude! Watched maybe a dozen videos on the topic and this was by far the beat one! :) keep up the great work

[@iComplainer]

Same avid KZbin watchers here. Gerald Undone value or better right here. Subscribed.

[@ryorye]

Best explanation I've seen so far! Subscribed!

[@99SBX]

I agree. Subscribed!

[@xxhamedxx01]

I barely get overwhelmed! But this video is pure gold! Very well explained! And you my man, you have a bright future in front of you cause you can't explain things that properly unless you have both the knowledge and intelligence!

[@thebreckincrew535]

So cool thank you brother!

[@danrpalmer]

I almost never comment on videos but I couldn't not do so here. This is one of the best tutorial videos I've ever seen breaking down a complex, somewhat esoteric topic into an understandable format to folk who have little or no prior experience in the domain. You've earned yourself a subscriber, and if you have a link to send a few bucks to you or a charity of choice, please feel free to reply with a link. Thanks for this superb content.

[@yeahright5663]

Such a well-thought-out script. Brilliant video!

[@alish2001]

I've learned SO SO much from this singular video. Amazing job man.

[@zhenkunwang2827]

Thank you so much! that explained everything. My understanding is 1. Human eye's light sensitivity is lower than that of the camera's. (ex. 50% light in camera is about 25% in human eye) 2. Gamma Correction, is a process that uses a mathematical model to match the digital screen light levels to that of the human eye's. 3. As the result, Gamma correction evenly distribute the light level across a digital screen which appears to be natural lighting to the human eye.

[@amanuel2135]

this channel is a gem, nice job!

[@EliasReda]

Great job explaining it, this is probably the only video I watched that knew how to explain it with important details without getting lost in them.

[@jacjacmtl]

That's the best video about Gamma correction I've ever seen. Very good job!

[@JoeKawano]

“What is Gamma Correction? Why should I care about it?” 😅 😅I’ve always been wondering the same thing.

[@jonathanniakale4226]

You are a Hero brother.

[@glenwoodfin]

Thank you! I had no idea what gamma correction was; now I'm starting to understand its application.

[@yohanesstefanus2597]

I learn a lot from this video, even though I'm not working in creative Industry

[@naderbazyari2]

awesome video. I had no idea what was going on behind the scene, I just always pressed a button and there was my picture

[@prabhakarrao4922]

Excellent insight into the topic of gamma in video work. Many thanks

[@subaquariamusic]

You're clearly very knowledgeable on this subject and are great at explaining the technical aspects in an understandable way. Just learned a lot. Thank you!

[@numkim]

BEST TUTORIAL IN THE WORLD!

[@celes123ovo]

Great job! I haven't known well about Gamma correction, and this helped me learn from fundamental scratch. Thanks!

[@camryhsalem5139]

You explain Very complex subject in an excellent way you are talented Man

[@walterarlenhenry]

This is an extremely helpful, and remarkably well-constructed lesson. I confess to having been confused about this subject in the past, and now it is making sense to me. Looking forward to watching more of your stuff.

[@shnake_case]

Thanks for great explanation! I think I am your 1000th subscriber 😊

[@daftstuff6406]

great concise explanation of this complex topic. thanks again.

[@sightlessghost289]

Underrated creator, this video was amazing my man.

[@farkasszakal]

Awesome. Pure gold information, very-well captured. Thank you!🙏

[@ddddddddd9417]

Great explanation buddy. You are talented

[@ScottConverse]

Well done! More please.

[@MrTerryRay1]

Thanks for this explanation. Now this whole area of gamma makes sense.

[@goemmer]

Thanks for the best gamma-correction-explanation on youtube!

[@rackzz7084]

All respect. I'm an artificial intelligence cs student and this is way better and more interesting than the stuff my prof did

[@VideoTechExplained]

I am also a CS student actually, I feel your pain.

[@ravensatodds]

Great explanation mate 👍🏼

[@JOHAN_PERJUS]

ERRATA: Adding ONE light, as in the example, does not DOUBLE the amount of light (or photons) hitting the paper, this is because of something called the inverse square law. In order to DOUBLE the amount of photons it would require adding THREE additional lights. Please correct me if I am wrong. Otherwise, thank you for a very well explained video on Gamma curves. Kudos for the 4K upload as well!

[@VideoTechExplained]

I'm not sure how the inverse square law applies in this case. In my demonstration, I'm assuming the two lights are perfectly pointed at the exact same spot, in which case there would be twice as many photons reflecting off of that point. Granted, the alignment wasn't actually perfect in my practical demonstration, but the point still holds. If you take two identical sources of light and point them at the same spot, there will be twice as many photons reflecting off of it as there would be if there was only a single light source. However, while the number of photons is doubled, our eyes don't *perceive* the spot as being twice as bright

[@egjundis]

Thank you!!! Now I finally feel like Gamma vs. Linear make sense.

[@beautyadvocate]

Amazing video. This was the first straight forward, yet still in depth explanation I’ve heard. This was beyond helpful. Thank you.

[@kelasphotoshop2023]

Thank you. You have cleared my mind about this topic now

[@goemmer]

I have the feeling that you could get a great KZbinr. Keep making those videos! Greetings from Switzerland.

[@jleocarmo]

Fantastic video, congrats!

[@VeranoggaSystems]

This was awesome, keep up the good work!

[@dreaminmc2]

Best explanation I've seen so far

[@rajatbanerjee3413]

Splendid...keep up the good work

[@JohnMoran]

This was super interesting, and something I look all over for.

[@GhaithAshkar]

wonderfull , that is the most ever best explaning i've been see

[@mere_illusion]

great explanation!

[@smit17xp]

amazing explanation. Thanks

[@Gam3rKillz]

Your videos are so good, thank you

[@danipe1998]

Hey. This is a easy understandable well made video. Thank you for explaining me a problem i had never looked for.

[@NibuThomson]

Appreciating your efforts👏👏👏

[@당나귀-h2p]

Great explanation

[@eggs-benny]

awesome video, thanks for explaining!

[@JL-vk1rs]

fantastic video man, keep them coming!

[@hunter8980]

Very genius! Very impressive! Thanks!

[@Oceansta]

Great video. Might i recommend anti-glare glasses or repositioning the lights?

[@ianharper6015]

An excellent video. Thank you.

[@flyingkri]

Very nicely structured and informative! Thanks!

[@Debrugger]

Really good stuff, glad I found your channel!

[@cb7pwn]

why do all tech guys wear the EXACT same glasses...

[@mccafga]

Excellent video, thank you

[@mevsimpossible2]

Really enjoyed this video

[@marcosmartin7487]

I have learned a lot from this video. Thank you!

[@InvisageStudios]

Another great explaination! You have a gift of simplifying complex things. Great work

[@pixelman457]

this dude is so underrated

[@cassandra101ism]

Great information!! Thanks for an awesome video!

[@priesjensen]

Great video! Keep going :D

[@loicleray]

Thank you for making such an informative and succinct video. Much appreciated!

[@florubenberger]

That was a wonderful explanation - thank you very much!

[@jannespollet4830]

Thank you, explained very well!

[@dougkruse3766]

Great info, and very well done. Should be way more views.

[@QZ_AU]

Great video!!! I always ignore gamma in making videos. Your video explains it well!

[@vinayjb007]

Excellent video. But I have a question. Our eyes perceive the light in a non-linear fashion. After the inverse gamma is applied by the display device, the resultant signal becomes linear as shown at 4:22. So if the signal is linear again, how do we (human eye) perceive that light correctly? If I understand right, the signal is non-linear, then our eyes also would perceive it correctly. If human eye sees light linearly, then we would see the image a bit dark.

[@keziagreste]

So in real world we don't perceive luminance linearly but the things around us reflect light linearly. Similarly, the monitor emits light linearly and we don't perceive it linearly. It's just like real world, it is what we are used to. From what I understood, gamma curve is not about helping our eyes to see the right thing or correcting the non-linearity of luminance sensitivity. It is more about taking advantage of that fact and capturing data more efficiently with lower bit depth and avoid banding(with gamma curve, some highlights information, which we are very unlikely to perceive will be cut off so we can have more space for storing info regarding midtones and shadows).

[@richzhart2374]

Im really impressed! thanks for the explanation

[@FirstnameLastname-xo3tq]

Excellent. Thank you.

[@DrTexx]

Excellent video, really well broken down and executed too. Thank you!

[@adomdarojat3074]

very well done

[@lahiru3908]

Damn straight to the point. Love

[@Дмитрий-х6я1э]

Thank you vey much, this video helped me a lot!

[@stevebarlow]

Bravo! Been trying to make sense of gamma curves and this helped a lot. Thanks 😊

[@kencritchley5546]

Thanks for the great info. Well done.

[@seth.]

Nice job man! This was a fantastic video.

[@daracascansani]

Thanks a lot! Very well explained... :)))

[@mcarril]

Great video! Good job!

[@calmetosis]

Good stuff, Thank you!

[@chetg2924]

Hey man, nice video.

[@masoomehtanghatari8750]

So great and informative video. Thank you so much

[@NickGoldston]

Extraordinary job. Thank you

[@mickysingh483]

Great explanation, keep it up 👍 👏

[@computate.d9140]

Thanks! Very helpful video!

[@valerievnaa]

Thank you for explanation!

[@constantinasay2095]

loved it, please do more like this content

[@7guitarlover]

this is so awesome ! thanks buddy !

[@dillonkellerman2549]

Thank you VERY much.

[@mariahezra]

This was so helpful! Thanks so much!

[@K-Visuals]

Thanks for making this! This was very informative for me :)

[@georgecatterton5598]

Amazing work! I wish I could thank you more!