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Resizing and image resolution

From: Photoshop CS4 Essential Training

Video: Resizing and image resolution

When you have that one great image, odds are you're going to want to share it at different sizes. Maybe you want the original size to put in a frame and some smaller ones to put on the web or to put in your wallet. Before you resize images, it's important to understand how Photoshop handles resizing and the related topic of image resolution. To resize an image, I'm going to go to the Image menu at the top of the screen and choose Image Size. In this dialog box I can see the current size of my image. Here at the top, I see the size in pixels.

Resizing and image resolution

When you have that one great image, odds are you're going to want to share it at different sizes. Maybe you want the original size to put in a frame and some smaller ones to put on the web or to put in your wallet. Before you resize images, it's important to understand how Photoshop handles resizing and the related topic of image resolution. To resize an image, I'm going to go to the Image menu at the top of the screen and choose Image Size. In this dialog box I can see the current size of my image. Here at the top, I see the size in pixels.

Every photograph or other rasterized file is made up of small rectangles of color information called pixels, which stands for picture elements. Down here, I can see the size of the file as it would be when printed in inches. Right now, this file is going to print pretty big at over 16 inches wide and 25 inches high. That's do in part to the fact that this file came in for my digital camera with 72 pixels allocated to every inch. That actually is too low a resolution when I'm preparing a file for print.

So, I want to increase the resolution to around 300 pixels/inch, which is what my inkjet printer needs in order to make the best print. That number may change depending on your brand of inkjet printer and the kind of print you're making. But 300 pixels/inch is a good round number to use. To change the resolution, I first need to go down to the Resample Image field and uncheck that box. And now I want to come in and change the Resolution from the 72 pixels/inch that my camera offered to the 300 pixels/ inch that my printer needs, the width and height are reduced.

But as you can see at the top of this dialog box, I haven't thrown away information. I still have the same number of pixels in width and height and the same file size. I've just rearranged that information into a different configuration of inches and resolution. Now let's say that I decide I want a copy that's actually 3"x2" but I do want it to have 300pixels/inch of resolution. In that case, I have to check the Resample Image dialog box and now when I change any of these fields, I'll actually be throwing away some information.

So, I'm going to scale down this image to say 3 inches in height, the width changes accordingly to 2 inches and the resolution has stayed the same. But at the top of the dialog box, I can see that I really have thrown away information. When I do reduce the overall size of an image like this, I want to make sure that Photoshop uses the best possible formula, when it decides which image information to discard. I'm going to go down to this menu at the bottom of the screen and there I can see that when I'm reducing an image, this is the best formula to use, Bicubic Sharper.

So, I'll choose that one and I'll click OK. And now my image is ready for print at 3"x2" at the proper resolution for my inkjet printer. One more thing to keep in mind when you're resizing images is it's fine to resize down as I just showed you how to do, but be conservative about scaling an image up, because when you do so, you're asking Photoshop to make up some image information to fill in some gaps. If you need to resize your own images please keep these tips and techniques in mind so that you get just the right size image without degrading your photo quality.

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This video is part of

Image for Photoshop CS4 Essential Training
Photoshop CS4 Essential Training

103 video lessons · 67526 viewers

Jan Kabili
Author

 
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  1. 2m 31s
    1. Welcome
      1m 27s
    2. Using the example files
      1m 4s
  2. 25m 14s
    1. Touring the interface
      4m 25s
    2. Working with tabbed documents
      5m 15s
    3. Using tools efficiently
      3m 51s
    4. Arranging panels
      3m 53s
    5. Customizing keyboard shortcuts
      2m 50s
    6. Saving a custom workspace
      3m 0s
    7. Changing screen modes
      2m 0s
  3. 19m 3s
    1. Touring the Bridge interface
      6m 31s
    2. Opening images from Bridge
      1m 20s
    3. Reviewing images
      4m 42s
    4. Finding images
      6m 30s
  4. 44m 53s
    1. Setting preferences
      4m 23s
    2. Choosing color settings
      8m 11s
    3. Zooming and panning
      5m 27s
    4. Resizing and image resolution
      3m 17s
    5. Adding to the canvas
      2m 2s
    6. Rotating the canvas
      1m 44s
    7. Choosing color
      4m 49s
    8. Sizing a brush tip
      3m 4s
    9. Undoing and the History panel
      5m 0s
    10. Saving and file formats
      3m 29s
    11. Creating a file from scratch
      3m 27s
  5. 37m 58s
    1. Making geometric selections
      6m 14s
    2. Modifying selections
      4m 43s
    3. Combining selections
      3m 16s
    4. Using the Quick Selection tool
      5m 34s
    5. Refining selection edges
      4m 12s
    6. Using Quick Mask mode
      2m 18s
    7. Selecting with the improved Color Range command
      4m 32s
    8. Selecting with the Magnetic Lasso tool
      2m 28s
    9. Using the Background Eraser tool
      3m 7s
    10. Saving selections
      1m 34s
  6. 39m 56s
    1. Understanding layers
      5m 43s
    2. Creating layers
      5m 12s
    3. Working in the Layers panel
      2m 19s
    4. Locking layers
      4m 17s
    5. Working with multiple layers
      4m 6s
    6. Merging and flattening layers
      3m 55s
    7. Adding a shape layer
      4m 43s
    8. Basic layer masking
      4m 23s
    9. Using layer blend modes and opacity
      5m 18s
  7. 23m 19s
    1. Cropping
      3m 26s
    2. Straightening
      3m 17s
    3. Transforming
      4m 42s
    4. Working with Smart Objects
      6m 48s
    5. Using Content-Aware Scaling
      5m 6s
  8. 1h 10m
    1. Reading histograms
      4m 21s
    2. Using adjustment layers and the Adjustment panel
      6m 4s
    3. Adjusting tones with Levels
      7m 49s
    4. Limiting adjustments with layer masks
      5m 40s
    5. Using masks in the new Masks panel
      6m 9s
    6. Limiting adjustments by clipping
      3m 6s
    7. Adjusting with Shadow/Highlight
      5m 7s
    8. Adjusting with Curves
      7m 37s
    9. Adjusting with Hue/Saturation
      3m 42s
    10. Adjusting with Vibrance
      2m 16s
    11. Removing a color cast
      4m 26s
    12. Using the Black & White adjustment layer
      2m 39s
    13. Using the Dodge Burn and Sponge tools
      4m 11s
    14. Reducing noise
      2m 39s
    15. Sharpening
      4m 42s
  9. 38m 0s
    1. Using the Spot Healing Brush tool
      5m 17s
    2. Using the Healing Brush tool
      5m 51s
    3. Using the Patch tool
      4m 52s
    4. Using the Clone Stamp tool
      4m 8s
    5. Enhancing eyes
      9m 29s
    6. Changing facial structure
      5m 0s
    7. Softening skin
      3m 23s
  10. 44m 38s
    1. What's a raw image?
      4m 25s
    2. Touring the Camera Raw interface
      7m 35s
    3. Working in the Basic panel
      7m 54s
    4. Working in the Tone Curve panel
      2m 21s
    5. Working in the HSL/Grayscale and Split Toning panels
      3m 46s
    6. Looking at the other Camera Raw panels
      3m 45s
    7. Using the Adjustment Brush tool
      4m 2s
    8. Using the Graduated Filter tool
      3m 56s
    9. Working with multiple files
      6m 54s
  11. 21m 6s
    1. Using the Brushes panel
      8m 30s
    2. Filling with color
      3m 49s
    3. Replacing color
      4m 14s
    4. Using gradients
      4m 33s
  12. 16m 55s
    1. Working with point type
      9m 59s
    2. Working with paragraph type
      3m 17s
    3. Warping text
      3m 39s
  13. 25m 23s
    1. Adding a layer style
      4m 6s
    2. Customizing a layer style
      3m 35s
    3. Copying a layer style
      3m 5s
    4. Creating a new style
      3m 32s
    5. Using Smart Filters
      5m 22s
    6. Working in the Filter Gallery
      5m 43s
  14. 13m 14s
    1. Auto-blending focus
      4m 47s
    2. Creating Photomerge panoramas
      4m 2s
    3. Combining group photos
      4m 25s
  15. 23m 27s
    1. Creating an action
      7m 16s
    2. Batch processing with an action
      6m 36s
    3. Using the Image Processor
      9m 35s
  16. 29m 20s
    1. Printing
      11m 32s
    2. Making a contact sheet from Bridge
      6m 12s
    3. Creating a web gallery from Bridge
      7m 17s
    4. Preparing photos for the web
      4m 19s
  17. 30s
    1. Goodbye
      30s

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