1 00:00:00,640 --> 00:00:03,170 Let's kick off with resolution. 2 00:00:03,170 --> 00:00:08,040 In this course, we're gonna tackle two types of resolution, image resolution and 3 00:00:08,040 --> 00:00:09,870 display resolution. 4 00:00:09,870 --> 00:00:14,280 When referring to images, resolution is the density of information, 5 00:00:14,280 --> 00:00:18,180 typically within an inch, contained within the image file. 6 00:00:18,180 --> 00:00:20,940 PPI, or pixels per inch, 7 00:00:20,940 --> 00:00:25,740 tells us how many pixels are represented in a square inch when printed. 8 00:00:25,740 --> 00:00:30,640 Or, put simply, resolution is the amount of detail available in the image. 9 00:00:31,850 --> 00:00:36,520 For displays or screens, resolution it how many pixels a display contains. 10 00:00:36,520 --> 00:00:43,380 Typically represented in columns by rows, for example, 1920 pixels by 1080 pixels. 11 00:00:43,380 --> 00:00:44,250 Let's have a closer look. 12 00:00:45,400 --> 00:00:50,490 Displays are made of pixels, the smallest unit of measurement for any display. 13 00:00:50,490 --> 00:00:53,420 Put the pixels together in rows and columns, and 14 00:00:53,420 --> 00:00:55,630 we're able to display our content. 15 00:00:55,630 --> 00:00:59,790 The resolution of our display is conveyed in the number of columns of pixels 16 00:00:59,790 --> 00:01:01,458 by the number of rows. 17 00:01:01,458 --> 00:01:02,172 For example, 18 00:01:02,172 --> 00:01:07,300 that old CRT display I had back in the day, it's resolution was 640 by 480. 19 00:01:07,300 --> 00:01:13,212 Today, the common resolution for an LCD monitor is 1366 by 768, 20 00:01:13,212 --> 00:01:19,050 and HDTV can be 1920 by 1080. 21 00:01:19,050 --> 00:01:23,650 Now a days, we're seeing screens that fit more pixels into smaller areas, 22 00:01:23,650 --> 00:01:26,620 resulting in high pixel density displays. 23 00:01:26,620 --> 00:01:31,320 For example, a 4K TV, or Apple's Retina displays. 24 00:01:31,320 --> 00:01:34,443 Because these displays have smaller pixels, it allows for 25 00:01:34,443 --> 00:01:37,500 finer detail at a closer viewing distance. 26 00:01:37,500 --> 00:01:41,470 Which brings us to the next consideration when talking about resolution, 27 00:01:41,470 --> 00:01:43,753 the physical dimensions of the display. 28 00:01:43,753 --> 00:01:47,980 Here's my old-school CRT display, 29 00:01:47,980 --> 00:01:54,400 a 13" screen measured diagonally, displaying 640 by 480 pixels. 30 00:01:54,400 --> 00:02:00,800 And here's my original iPhone, displaying 320 by 480 on a 3.5" diagonal. 31 00:02:00,800 --> 00:02:07,660 For additional context, here's a Macbook Pro Retina display, and a 4K 55-inch TV. 32 00:02:08,870 --> 00:02:13,740 So our takeaway, a pixel isn't the same size on all devices. 33 00:02:13,740 --> 00:02:17,490 Sometimes it's super tiny, and sometimes it's fairly large. 34 00:02:17,490 --> 00:02:22,120 An example of large pixels are those displays at Times Square in New York. 35 00:02:22,120 --> 00:02:25,867 If you were to get close to them, the pixels would be quite large. 36 00:02:25,867 --> 00:02:30,857 While from the street, it may be tougher to discern individual pixels. 37 00:02:30,857 --> 00:02:34,361 Which leads me to the last time to think about when considering resolution, 38 00:02:34,361 --> 00:02:36,898 the distance that which you're viewing the display. 39 00:02:36,898 --> 00:02:39,878 The closer our eyes are supposed to be to the screen, 40 00:02:39,878 --> 00:02:42,518 the smaller the pixel should be. 41 00:02:42,518 --> 00:02:47,430 And as you get further out, you can grow the size of the physical pixel and 42 00:02:47,430 --> 00:02:49,850 still maintain that crisp image or video. 43 00:02:51,240 --> 00:02:55,790 That's why we're not able to discern individual pixels on a HDTV or 44 00:02:55,790 --> 00:03:00,980 a phone that are similar resolution, but different physical sizes. 45 00:03:00,980 --> 00:03:03,550 In the next video, we'll take a look at an example 46 00:03:03,550 --> 00:03:07,630 of how display resolution affects images on different devices.