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The Image Size command

From: Photoshop CS6 One-on-One: Fundamentals

Video: The Image Size command

In this movie, I'll introduce you to the Image Size command which allows you to change both the image size and the resolution of a Photoshop document. I'm looking at that same low res artwork. However, this time it's a flat file without any layers or layer comps. Now let's say I want to change the pixel dimensions or the resolution. I'd go up to the Image menu, and choose the Image Size command, or you can press the keyboard shortcut Ctrl+Alt+I or Command+Option+I on the Mac. Notice that this dialog box is divided into three parts; at the top we have the Pixel Dimensions, our Width of 918 pixels, and a Height of 632 pixels.

The Image Size command

In this movie, I'll introduce you to the Image Size command which allows you to change both the image size and the resolution of a Photoshop document. I'm looking at that same low res artwork. However, this time it's a flat file without any layers or layer comps. Now let's say I want to change the pixel dimensions or the resolution. I'd go up to the Image menu, and choose the Image Size command, or you can press the keyboard shortcut Ctrl+Alt+I or Command+Option+I on the Mac. Notice that this dialog box is divided into three parts; at the top we have the Pixel Dimensions, our Width of 918 pixels, and a Height of 632 pixels.

The two values are linked to each other because the Constrain Proportions check box is turned on. Were I to turn that value off, my link would disappear so that I could change each value independently. But, that's not what I want to do. So I'll just go ahead and leave that check box on. This Megabyte value at the top here tells you the size of the image in memory. So when Photoshop opens an image in RAM, it opens the image uncompressed always, there's no way around that. And how this value is calculated, just in case you're curious, is you take the total pixel count of the image, in our case about 580,000, and you multiply that value times 3, because every full color RGB pixel consumes 3 bytes in memory.

Next we have the so-called Document Size options. This should probably read Print Size because that's what all of these values are about. The size of the image when you either print it or place it inside of a print file such as one created in Illustrator or InDesign. Notice in our case, the image measures about 9 inches wide, and about 6 inches tall because the Resolution is set to 100 pixels per inch. Also, notice right now that we have a link between the Width and Height values, again because Constrain Proportions is turned on, but we don't have a link to the Resolution.

So I could change the Resolution value to something like 300 pixels per inch. That will not change the Width or Height value in our case, but that will increase the number of pixels inside the image dramatically, and it will increase the size of the image in RAM as well. That's because Resample Image is turned on, and resample means to invent new pixels. So in our case, we would be upsampling the image because we're adding pixels to it. If we are reducing the number of pixels, that's called downsampling and you'll hear those terms more in the future.

However, I could turn off the Resample Image check box. And if I do that, then my Pixel Dimension values become dimmed and all of my Document Size values are linked together. And that's because with this check box off, you are not going to change the number of pixels inside the image. The image size, that is, the Pixel Dimensions, will remain exactly the same, just the resolution and the size of the printed image will change. And then notice in our case, because we've taken the Resolution value up and we're packing more pixels into a linear inch, the result will be a much smaller image.

It will print at just 3 inches wide and a little more than 2 inches tall. If I were to reduce the number of pixels, let's say I take it down to 72 pixels per inch, then the printed size of the image expands to nearly 13 pixels wide and nearly 9 pixels tall. And that's how you work inside the Image Size dialog box. In the next movie, I'll show you a practical application of this command.

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This video is part of

Image for Photoshop CS6 One-on-One: Fundamentals
Photoshop CS6 One-on-One: Fundamentals

100 video lessons · 56137 viewers

Deke McClelland
Author

 
Expand all | Collapse all
  1. 19m 15s
    1. Welcome to One-on-One
      2m 27s
    2. Opening from the Windows desktop
      4m 7s
    3. Opening from the Macintosh Finder
      4m 9s
    4. Opening from Photoshop or Bridge
      2m 45s
    5. Opening an image from Mini Bridge
      1m 16s
    6. Opening through Camera Raw
      2m 32s
    7. Closing one image and Closing All
      1m 59s
  2. 38m 14s
    1. Navigating your image
      40s
    2. The dark vs. the light interface
      3m 12s
    3. Navigating tabs and windows
      4m 32s
    4. Panels and workspaces
      4m 27s
    5. Zooming incrementally
      4m 29s
    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. Adjusting a few screen prefs
      4m 16s
  3. 45m 58s
    1. Digital imaging fundamentals
      1m 45s
    2. Image size and resolution
      3m 3s
    3. The Image Size command
      3m 27s
    4. Common resolution standards
      3m 20s
    5. Upsampling vs. real pixels
      4m 36s
    6. Changing the print size
      6m 16s
    7. Downsampling for print
      4m 12s
    8. Downsampling for email
      3m 11s
    9. The interpolation settings
      5m 22s
    10. Downsampling advice
      4m 36s
    11. Upsampling advice
      6m 10s
  4. 53m 17s
    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
      2m 58s
    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 19s
    1. The art of saving
      54s
    2. Four things to know about saving
      6m 0s
    3. Saving layers to PSD
      6m 38s
    4. Saving print images to TIFF
      4m 48s
    5. Saving an interactive image to PNG
      3m 41s
    6. Saving a flat photo to JPEG
      4m 18s
  6. 19m 36s
    1. Honing in on your image
      1m 43s
    2. The new and improved Crop tool
      3m 35s
    3. Editing your last crop
      3m 1s
    4. Straightening a crooked image
      2m 29s
    5. Filling in missing details
      6m 44s
    6. Using the Perspective Crop tool
      2m 4s
  7. 42m 6s
    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
      3m 19s
    5. The Brightness/Contrast command
      2m 47s
    6. The dynamic adjustment layer
      4m 5s
    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 cast 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. 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 49s
    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 58s
    10. Brightening teeth
      4m 0s
    11. Intensifying eyes
      4m 43s
  11. 51s
    1. Goodbye
      51s

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