Image Recognition and Python Part 3

Key Takeaways

hello everybody and welcome back to the third video in the image recognition and manipulation tutorial Series where we left off we were looking at that array and in this video we're going to take a bit more closer look at it again and explain a few more things in the array and then we'll go ahead and get started with actual uh manipulation and stuff so here's the array again and um just to say it again the whole thing is the image broken down is the rows right these are the rows and then you've got each pixel in that row and it's you know horizontal right pixel pixel and each number within here corresponds to red green blue and then this is your Alpha and again Alpha is like fade basically or um how solid is that that picture so if so or color rather so if you have um a very low Alpha it's very see-through right transparent that's the word I'm looking for transparent so anyway that's what Alpha is now the next thing that we might want to consider is y 255 what the heck is that talking about well in programming everything is is counted not starting at one but it starts at zero so actually these are all 256 so this just means the image was saved as a 256 color bit map not to be confused with like a 256bit image right so so like if you think about um a 16 color bit map that means it it only allows like 0 to 15 so 16 total colors which is actually quite a few colors um so that if a 16 color bit map will give you as many as 4,096 colors 256 colors uh will give you obviously a much larger right cuz it's basically your options are 16 * 16 * 16 right so that makes 496 with 2 56 colors it's 256 * 256 * 256 which gives you basically 16.8 million colors that you can choose from so obviously there's a lot more depth to your colors but I'll be also honest with you if you look like a like a non zoomed in uh picture and one uses uh the 16 by 16 x 16 right so 16 color bit map versus the 256 color bitmap even though there's right a massive difference in colors it's kind of hard to tell the difference anyways but um that's neither here nor there but I'm just explaining what these numbers are so moving right along next question that a lot of people are going to have is why is this RGB and not rwb or WB you know why is it not rwb that's a good question why is it not red white and blue anyway why is it RGB and not r y be having a really hard time putting that out right so why is it you know aren't we taught like an art class right three primary colors that make all the other colors red yellow blue right so why are we write red RGB is red green blue so why are we doing that well little bit of history for you guys and I bet some of you guys probably know but it boils down to the difference between additive colors versus subtractive colors now what we're dealing with is additive colors so as you add more of that color it actually like makes it brighter so to speak whereas if you uh consider like back in art right in paint class if you had a green right say you were painting some green and you paint a stripe of green and then you paint another stripe of green over that previous stripe it makes it a darker green not a lighter green and but if you took like a flashlight and you put over like a green let's say Saran wrap that was green and you turned on that flashlight and then you got another flashlight and did the same thing it would make that green brighter right it wouldn't make it darker by adding more so it's the the addition of light behind it so that's why like um well first of all like white has all the colors in it right so pure white we know this is white because it's 255 255 so it's all of red all of green and are all of um blue right so we know this this is actually white and it's a solid white not that even Alpha of white wouldn't really make a difference but anyway um unless it was laid over something I suppose um so and that's why like sunlight for example is mostly white because it has all of the colors in it and that's why it is um it's an additive right and conversely uh where where we've got 0 0 0 this means there's nothing nothing and nothing there is nothing there and it's got an A full Alpha so it's a solid you guessed it black so so that is additive uh versus subtractive colors and then the reason why we're using this in computers now you could do it either way really computers cuz it's just straight up just generating this stuff but it just kind of makes sense to make it additive instead of subtractive color schemes because um you're everything you do on the computer you're viewing it through a monitor and the monitor is basically a light that is shining this stuff to you so so that's kind of why we're using RGB so the more you know so uh the next thing that I would like to do is uh this was just dot right so we see 0000 255 and then we've got all these other 255 so if we closed out of this and I think I stuck it in that file let's uh let me pull that up real quick the images yeah I sure did so in the images file we had Dot and then there's also Dot and Dot so if you go edit that you should get this and then if you zoom in you'll see there's one black dot and then there's this one Green Dot and let me just grab the pencil and come over here to the green I use this green so if we edited that color we can actually see down here the the red green and blue value of this uh Green Dot so it's 34 17776 so if we uh close out of this and just remember it's Dot and Dot and we change this to not dot.png but Dot and dot.png run it and come over here scroll back to the top here we still have that black dot right and then sure enough we've got 34 177 76 and then a full Alpha so obviously solid green so I realized too some of you guys that might sound might have been like painfully slow and you already knew everything I just told you but um if if you're uncomfortable with the idea of transferring an image to an array right and it's an array of red green blue and Alpha at first that's very confusing and you've got to kind of situate yourself to look at this and see it right so unless you're from The Matrix you probably don't like look at this array and be like oh okay I see that it's a black dot and a Green Dot right but now now I'm slowly converting you guys and pretty soon you'll be able to look at an array and just be able to see the image you know so you don't even need images anymore you just need the arrays and you can just like look at it and be like that is beautiful that's a good idea I bet you could do like computer artwork or something right and just make it the array and then uh put like the array up on the wall and make people look at it like that's just beautiful anyway I bet there's someone that really can't like look at the array and know what the picture is but not me anyway um so that's going to conclude this video as always thanks for watching thanks for your support your subscriptions and until next time