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Image size and resolution

From: Photoshop CC One-on-One: Fundamentals

Video: Image size and resolution

In this movie, I'll introduce you to a couple of very important topics that are critical to your understanding of Photoshop, specifically in the larger realm of digital imaging in general. Now, I'm looking at this kind of psychedelic weave. And this far out, it looks to be extremely smooth, with these dark and light lines fading in and out vertically. And the colors fading back and forth horizontally. But like any digital image, this one is made up of pixels, and if you ever want to see those pixels, all you have to do is zoom in.

Image size and resolution

In this movie, I'll introduce you to a couple of very important topics that are critical to your understanding of Photoshop, specifically in the larger realm of digital imaging in general. Now, I'm looking at this kind of psychedelic weave. And this far out, it looks to be extremely smooth, with these dark and light lines fading in and out vertically. And the colors fading back and forth horizontally. But like any digital image, this one is made up of pixels, and if you ever want to see those pixels, all you have to do is zoom in.

I'm going to press and hold the Z key and drag to the right in order to zoom. And even before I get to the pixel grid, it's obvious this image contains pixels. Once I go beyond 500% and I can see the pixel grid it becomes more obvious still. Now by the way, if at any time you want to hide the pixel grid, all you have to do is go up to the View > Show > Pixel Grid, to turn the command off. And sure enough, we've got a bunch of pixels.

In fact, this close in the image looks comically simple, almost like something out of the game Minecraft. The number of pixels that work inside of an image is known as the image size. So I'm going to go ahead and switch over to this graphic image right here. Which contains a couple of drawings I did with my kids a few years back. And these graphics are going to help us understand some key topics up front. We'll see how image size and resolution affects photographic images later in this cahpter. Now notice I'm viewing the image at the 100% view size which means that it's a very tiny image indeed. Often times you'll hear folks call this short of image, low resolution or low res for short.

But really, the more accurate way to describe it is small because it just doesn't contain many pixels. Now, I'm going to tour you through this image using what's known as Layer Comps. And I'll explain what's going on with Layer Comps in a future course. But, for now, if you want to see them, you can go to the Window > Layer Comps, to bring up the Layer Comps panel. And I'm just going to be advancing through each of these guys. The Layer Comp, in its most simple form, saves which layers are turned on and off.

Now I'm not going to need the panel, because I've set up a custom keyboard shortcut that allows me to advance from one comp to the next. Now this image, happens to measure 918 pixels wide by 632 pixels tall. Which means that we've got a total of 918 times 632, which equals more than 580,000 pixels. Now, at first glance, that might seem like a lot. And it would be if we were talking about dollars, for example.

But in the world of digital photography, that's nothing. Consider that a low end digital camera starts off at 12 megapixels and the high ends are somewhere in the 20's. Which means that we're talking about 12 to 20 million pixels, inside a photograph. Now the definition of image size, by the way, is that it describes the pixel dimensions and the total pixel count. In this case, what we were just discussing, 918 by 632 Equals 580,000 pixels.

Every single image you ever open or work with inside Photoshop has an image size associated with it. Meanwhile, there's Resolution, which is really like pixel population density. It's the number of pixels packed into a linear inch or millimeter. So in this case, for example, the resolution of the image, and I'll show you how to set that in a future movie, the resolution is set to 100 pixels per inch, also known as 100 ppi.

Which means that we have 100 per horizontal inch by 100 pixels per vertical inch, and therefore we have 100 times 100 which is 10,000 pixels in a square inch. That mean seem very high, but actually it's a very low resolution. And, something to know about resolution, it applies to print only It is meaningless for screen graphics, so if you're talking about a web graphic for example, you don't need to worry about resolution. Now you might say well Deke back in the previous chapter you were talking about screen resolution when you were discussion retina display, and high DPI monitors. And that is true.

So I'll go ahead and switch over to this graphic here, and just because it contains a Photoshop interface of its own, I'm going to press Shift + F in order to hide Photoshop's real interact here. So here's the retina display image. And the screen has a resolution of 2880 by 1800. That is a total of more than 5 million pixels, and it works out to a resolution of 221 pixels per inch. That's the screen's resolution.

It has nothing to do with the image resolution. The resolution of this image, happens to have been set to 300 pixels per inch. And that is entirely independent of the screen. Now, imagine if we had a hypothetical screen whose resolution was, essentially, half what we just saw, 1440 by 900, which is one of the possible settings with the monitor I'm using here. Which would be a total of about 1.3 million pixels or a 111 pixels per inch. In that case, the photograph would look like this instead. Still shown at the 100% view size by the way, so both of these images are appearing in at a 100%.

It's just because the screen display fewer pixels. Those pixels are going to be much larger and we're going to see less of the image at a time. So, the moral of the story is, image size is applicable to every single image you create because it describes the physical pixel count inside the image, whereas, resolution is only applicable to images that you intend to print. And those are the basics of image size and resolution throughout the world of digital imaging, as well as right here at home inside Photoshop.

Show transcript

This video is part of

Image for Photoshop CC One-on-One: Fundamentals
Photoshop CC One-on-One: Fundamentals

103 video lessons · 28920 viewers

Deke McClelland
Author

 
Expand all | Collapse all
  1. 38m 23s
    1. Welcome to One-on-One
      1m 51s
    2. Opening from the Windows desktop on Windows 8 (CC 2014)
      6m 16s
    3. Opening from the Windows desktop on Windows 7 or earlier (CC)
      5m 48s
    4. Opening from the Macintosh Finder
      7m 10s
    5. Opening from Photoshop or Bridge
      3m 52s
    6. Opening an image from Mini Bridge (CC)
      2m 39s
    7. Opening through Camera Raw
      5m 11s
    8. Closing one image and closing all
      5m 36s
  2. 52m 47s
    1. Navigating your image
      40s
    2. The dark vs. the light interface
      6m 2s
    3. Navigating tabs and windows
      4m 32s
    4. Panels and workspaces
      6m 20s
    5. Zooming incrementally
      6m 22s
    6. Zooming continuously
      2m 43s
    7. Entering a custom zoom value
      2m 25s
    8. Scrolling and panning images
      2m 31s
    9. Rotating and resetting the view
      2m 11s
    10. Cycling between screen modes
      3m 10s
    11. Using the Navigator panel
      3m 38s
    12. Using Retina and HiDPI displays
      4m 3s
    13. Adjusting a few screen preferences
      8m 10s
  3. 1h 2m
    1. Digital imaging fundamentals
      1m 45s
    2. Image size and resolution
      6m 34s
    3. The Image Size command
      6m 9s
    4. Common resolution standards
      4m 7s
    5. Upsampling vs. real pixels
      7m 59s
    6. Changing the print size
      8m 15s
    7. Downsampling for print
      5m 14s
    8. Downsampling for email
      6m 22s
    9. The interpolation settings
      6m 40s
    10. Downsampling advice
      5m 5s
    11. Upsampling advice
      4m 15s
  4. 53m 20s
    1. The layered composition
      1m 40s
    2. Introducing the Layers panel
      4m 12s
    3. Adding, scaling, and aligning layers
      5m 27s
    4. Dragging and dropping layers
      4m 36s
    5. Stack, reveal, and rename
      3m 1s
    6. Opacity, history, and blend mode
      6m 5s
    7. Duplicating a selected portion of a layer
      5m 32s
    8. Applying a clipping mask
      3m 58s
    9. Blending inside a clipping mask
      4m 10s
    10. Finishing off your artwork
      3m 13s
    11. Creating a new layer and background
      4m 24s
    12. Layering tips and tricks
      7m 2s
  5. 26m 13s
    1. The art of the save
      54s
    2. Four things to know about saving
      5m 59s
    3. Saving layers to PSD
      6m 34s
    4. Saving print images to TIFF
      4m 48s
    5. Saving an interactive image to PNG
      3m 40s
    6. Saving a flat photo to JPEG
      4m 18s
  6. 32m 16s
    1. Honing in on your image
      1m 43s
    2. The new and improved Crop tool
      4m 35s
    3. Editing your last crop
      6m 29s
    4. Cropping to a specific ratio or size
      5m 57s
    5. Straightening a crooked image
      4m 44s
    6. Filling in missing details
      6m 44s
    7. Using the Perspective Crop tool
      2m 4s
  7. 44m 51s
    1. First, there is brightness
      2m 12s
    2. How luminance works
      4m 18s
    3. The three Auto commands
      3m 27s
    4. Automatic brightness and contrast
      6m 5s
    5. The Brightness/Contrast command
      2m 47s
    6. The dynamic adjustment layer
      4m 4s
    7. Editing adjustment layers
      3m 52s
    8. Isolating an adjustment with a layer mask
      3m 31s
    9. Introducing the histogram
      4m 58s
    10. Measuring an adjustment
      3m 34s
    11. Using the Shadows/Highlights command
      6m 3s
  8. 44m 33s
    1. And second, there is color
      1m 31s
    2. Identifying a color cast
      3m 34s
    3. Correcting a color cast automatically
      3m 57s
    4. Changing the color balance
      6m 10s
    5. Compensating with Photo Filter
      3m 11s
    6. Adjusting color intensity with Vibrance
      3m 29s
    7. Correcting color casts in Camera Raw
      5m 46s
    8. The Hue/Saturation command
      5m 26s
    9. Summoning colors where none exist
      4m 8s
    10. Making more color with Vibrance
      4m 27s
    11. Making a quick-and-dirty sepia tone
      2m 54s
  9. 55m 46s
    1. Making selective modifications
      1m 10s
    2. The geometric Marquee tools
      6m 1s
    3. Aligning one image element to another
      4m 59s
    4. The freeform Lasso tools
      3m 59s
    5. The Polygonal Lasso tool and Quick Mask
      5m 19s
    6. Cropping one selection inside another
      6m 15s
    7. Creating rays of light
      4m 44s
    8. Quick Selection and Similar
      4m 11s
    9. Making it better with Refine Edge
      4m 56s
    10. Integrating image elements
      2m 39s
    11. Magic Wand and Grow
      5m 17s
    12. Refine, integrate, and complete
      6m 16s
  10. 53m 48s
    1. Your best face forward
      1m 0s
    2. Content-Aware Fill
      6m 11s
    3. Using the Spot Healing Brush
      5m 36s
    4. The more capable "standard" Healing Brush
      5m 55s
    5. Meet the Clone Source panel
      3m 53s
    6. Caps Lock and Fade
      4m 57s
    7. The Dodge and Burn tools
      5m 1s
    8. Adjusting color with the Brush tool
      6m 35s
    9. Smoothing skin textures
      5m 57s
    10. Brightening teeth
      4m 0s
    11. Intensifying eyes
      4m 43s
  11. 49s
    1. Until next time
      49s

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