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Downsampling graphic art

From: Photoshop CS5 One-on-One: Fundamentals

Video: Downsampling graphic art

All right, a few exercises ago I was telling you that when I'm downsampling continuous-toned photographic images, I like to first flatten my artwork and then apply the Image Size command using Bicubic Sharper. That is not what I do when I'm working with high contrast designs or other artwork that include graphical elements, and lines, and shapes, and text, and that kind of thing, because in that case Bicubic Sharper doesn't fare nearly so well. I have opened the composition that I created by the end of Chapter 10 and I've called it Final MH banner 4x.psd, because it's four time as large as the final Web graphic that I want to create.

Downsampling graphic art

All right, a few exercises ago I was telling you that when I'm downsampling continuous-toned photographic images, I like to first flatten my artwork and then apply the Image Size command using Bicubic Sharper. That is not what I do when I'm working with high contrast designs or other artwork that include graphical elements, and lines, and shapes, and text, and that kind of thing, because in that case Bicubic Sharper doesn't fare nearly so well. I have opened the composition that I created by the end of Chapter 10 and I've called it Final MH banner 4x.psd, because it's four time as large as the final Web graphic that I want to create.

And by the way, when you first open this image, you're going to get this font warning, telling you that some fonts are missing. That's Rotis once again, just click OK and don't worry about it. I also have opened this image, which is the final size graphic, where I have gone ahead and downsampled the image to 590 pixels wide, and it's called High-contrast comparison.psd found inside the 12_for_Web folder. And notice that I have two layers, one is called Bicubic, one is called Sharper. Now, Bicubic is the downsampling with the standard default Bicubic, best for smooth gradient setting.

And Sharper is Bicubic Sharper. When you first turn on the Sharper graphic and compare it, you might think that it actually looks a little better because the stars are popping out and the glasses are looking a little more razor sharp and all that jazz, but actually we have some problems here. I'm going to go ahead and zoom in to this graphic to four times its normal size, so 400% zoom ratio. And notice that we have these black halos surrounding every single one of the letters inside this image. We also have black halos around the individual stars, which is an unnecessary degree of exaggeration.

And by the way, it's going to increase file size, because that makes the image harder to compress, and we have dark halos around the rims of the martini glasses and the bubbles, and on and on, compared with turning that layer off, we lose all those unnecessary dark halos. We really don't need them. This was a sharply focused, high-contrast piece of artwork in the first place. It stands on its own. It doesn't need a bunch of aftermarket sharpening. So, I'm going to return back to my Final MH banner 4x.psd file.

There's no reason to flatten this image and apply the Image Size command, because the only advantage that the Image Size command has over the downsampling powers of Save for Web is that Save for Web cannot do Bicubic Sharper. It's just does standard Bicubic all the time. Well, that's all we need and it works from the composite image. It doesn't look at the layers the way Image Size does, so it's the perfect solution. So, I'm not going to worry about flattening, I'm not going to worry about Image Size, I'm just going to go to the File menu, choose Save for Web & Devices, Ctrl+Shift+Alt+S, Command+Shift+Option+S on the Mac.

Now, if this was a sufficiently large image, it's possible that Save for Web & Devices will complain at you. And it will tell you that this image is just too big to work on, in which case you're going to have to flatten it and downsample it and all that jazz. But I'm starting from a moderately large image in the first place, not a horribly large one. All right. Let's switch to the Optimized display here, so that we're just seeing one image. And now I'm going to downsample the image by entering 590 for the W value and pressing the Tab key. As soon as you press Tab, it actually does its thing.

Now again, it has this disturbing habit at least in this version of Photoshop of showing me a bright line on the right and bottom edges of the preview, that doesn't turn out to actually be there, so just go ahead and ignore that. Right now I'm looking at the image compressed using JPEG, notice that JPEG High and I'll go ahead and zoom in, so I can better see what I'm doing. The good news is that we're getting a small file size of just under 47K. However, the bad news is especially when compared with the original version of the image that we have all kinds of artifacting going on.

And artifacts are pixel transitions that don't contribute to anything to our actual understanding of that image file. In other words, it's nothing we did on purpose. It's something that was added by the JPEG compression, and it ends up looking like we have noise details throughout the image. And it's also creating a little bit of wiggle around some of these letters. Notice that kind of duplication of information around the hump of the H right there, and it also impairs the legibility of the text, especially if you compare these details to the original image, which doesn't have any of that noise going on, very smooth transitions.

There isn't that weird detail over the edge and so on. So JPEG, even though it services continuous-tone photographic images very well, it doesn't do a very good job on high contrast artwork like this. We're better off using GIF or PNG, and I'm going to explain each in the upcoming exercises.

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This video is part of

Image for Photoshop CS5 One-on-One: Fundamentals
Photoshop CS5 One-on-One: Fundamentals

195 video lessons · 74735 viewers

Deke McClelland
Author

 
Expand all | Collapse all
  1. 39m 52s
    1. Welcome to Photoshop CS5 One-on-One
      1m 49s
    2. Making Photoshop your default image editor
      7m 43s
    3. Installing the DekeKeys keyboard shortcuts
      8m 10s
    4. Remapping Mac OS shortcuts
      7m 37s
    5. Installing the Best Workflow color settings
      4m 31s
    6. The color settings explained
      6m 54s
    7. Loading the CS5 color settings in Bridge
      3m 8s
  2. 53m 36s
    1. There is nothing you can't do
      2m 1s
    2. The power of Photoshop
      4m 43s
    3. Duplicating a layer
      4m 49s
    4. Liquifying an image
      4m 43s
    5. Adding a layer mask
      5m 54s
    6. Loading an alpha channel
      7m 42s
    7. Selecting with Color Range
      4m 10s
    8. Making a Hue/Saturation layer
      2m 53s
    9. Luminance blending
      7m 21s
    10. Mask density
      5m 9s
    11. Making a knockout layer
      4m 11s
  3. 51m 23s
    1. The best way to work
      41s
    2. Setting General preferences
      5m 33s
    3. Changing the pasteboard color
      5m 41s
    4. File handling, performance, and units
      7m 25s
    5. Touring the Photoshop interface
      11m 5s
    6. Creating and saving a workspace
      7m 21s
    7. Changing settings and updating the workspace
      6m 4s
    8. Resetting the preferences
      7m 33s
  4. 2h 46m
    1. The amazing Adobe Bridge
      1m 17s
    2. Making a new image
      5m 11s
    3. Opening an image
      7m 7s
    4. Opening and closing multiple images
      5m 24s
    5. Opening a problem image
      4m 23s
    6. Adding file information
      8m 37s
    7. Introducing Adobe Bridge
      7m 37s
    8. A whirlwind tour of Bridge
      7m 21s
    9. Adjusting the interface and thumbnails
      8m 18s
    10. Using the full-screen preview
      8m 5s
    11. Rotating images on their sides
      5m 38s
    12. Assigning star ratings and labels
      8m 40s
    13. Filtering thumbnails in the Contents panel
      9m 13s
    14. Moving, copying, and deleting files
      6m 34s
    15. Creating and assigning keywords
      6m 38s
    16. Searches and collections
      7m 3s
    17. Batch-exporting JPEG files
      8m 57s
    18. Batch-renaming
      7m 15s
    19. String substitution and regular expressions
      8m 50s
    20. Grouping images into stacks
      7m 21s
    21. Comparing images in Review mode
      5m 58s
    22. Playing images in a slideshow
      4m 49s
    23. Customizing and saving the workspace
      7m 17s
    24. Using Mini Bridge in Photoshop CS5
      8m 36s
  5. 1h 1m
    1. Learning to swim inside an image
      37s
    2. The tabbed-window interface
      5m 19s
    3. Arranging image windows
      4m 26s
    4. Common ways to zoom
      5m 31s
    5. New zoom tricks in Photoshop CS5
      4m 24s
    6. Hidden old-school zoom tricks
      4m 34s
    7. Scrolling and panning images
      4m 8s
    8. Viewing the image at print size
      6m 42s
    9. The Navigator and "bird's-eye" scrolling
      2m 56s
    10. Nudging the screen from the keyboard
      2m 39s
    11. Scroll wheel tricks
      3m 41s
    12. The Rotate View tool
      3m 36s
    13. Cycling between screen modes
      6m 17s
    14. Using the numerical zoom value
      6m 14s
  6. 1h 6m
    1. Imaging fundamentals
      58s
    2. What is image size?
      7m 45s
    3. The Image Size command
      6m 0s
    4. Selecting an interpolation option
      4m 56s
    5. Upsampling versus "real" pixels
      5m 22s
    6. The penalty of pixels
      5m 35s
    7. Print size and resolution
      7m 26s
    8. Downsampling for print
      6m 39s
    9. Downsampling for email
      7m 28s
    10. Options for upsampling
      8m 13s
    11. Better ways to make a big image
      6m 1s
  7. 44m 43s
    1. Frame wide, crop tight
      1m 2s
    2. Using the Crop tool
      8m 8s
    3. Fixing out-of-canvas wedges
      5m 31s
    4. Crop tool presets
      6m 53s
    5. Previewing the crop angle
      4m 24s
    6. The Crop command
      4m 47s
    7. Straightening with the Ruler tool
      4m 18s
    8. Cropping without clipping
      5m 1s
    9. Perspective cropping
      4m 39s
  8. 1h 41m
    1. Making drab colors look better
      1m 20s
    2. Brightness and contrast
      4m 10s
    3. Adjusting numerical values
      4m 26s
    4. Introducing adjustment layers
      5m 17s
    5. Editing adjustment layers
      2m 51s
    6. Saving adjustment layers
      4m 35s
    7. Adding a quick layer mask
      4m 23s
    8. Introducing the Histogram
      4m 34s
    9. Working with the Histogram panel
      6m 27s
    10. Using Color Balance
      7m 18s
    11. Introducing the Variations command
      4m 51s
    12. Luminance and saturation controls
      3m 54s
    13. Fading a static adjustment
      3m 21s
    14. How hue and saturation work
      4m 28s
    15. Rotating hues and adjusting saturation
      6m 4s
    16. Creating a quick and dirty sepia tone
      4m 42s
    17. Adjusting hues selectively
      5m 32s
    18. The Target Adjustment tool
      4m 24s
    19. Photoshop CS5 Target Adjustment enhancements
      53s
    20. Adjusting the color of clothing
      8m 44s
    21. Enhancing a low-saturation image
      4m 23s
    22. Refining saturation with Vibrance
      5m 1s
  9. 1h 57m
    1. Photoshop versus the real world
      1m 21s
    2. Meet the selection tools
      10m 26s
    3. Marking the center of an image
      4m 9s
    4. Drawing a geometric selection outline
      4m 45s
    5. Blurring a selection outline with Feather
      6m 8s
    6. Copy and paste versus drag and drop
      5m 31s
    7. Creating a graduated selection
      4m 29s
    8. Aligning one image with another
      4m 45s
    9. Accessing the Move tool on the fly
      3m 34s
    10. Invert and Match Colors
      5m 4s
    11. Matching colors selectively
      3m 52s
    12. Feathering and filling a selection
      5m 14s
    13. Dressing up a composition with effects
      5m 34s
    14. The incredible image rotation trick
      2m 18s
    15. The Magic Wand tool
      4m 12s
    16. Tolerance and other options
      7m 7s
    17. Grow, Similar, and Inverse
      5m 39s
    18. Quick selection and the Magnetic Lasso
      7m 27s
    19. Evaluating a selection in Quick Mask
      8m 52s
    20. Saving and loading selections
      6m 14s
    21. Placing an image with a layer mask
      3m 23s
    22. Eliminating edge fringing
      7m 43s
  10. 1h 58m
    1. Brushing to correct
      56s
    2. How brushing works
      4m 52s
    3. Working with spacing
      7m 32s
    4. Changing size and hardness
      7m 45s
    5. The heads-up Color Picker
      7m 17s
    6. Flipping a mirror image
      3m 33s
    7. Setting the source for the History brush
      3m 42s
    8. Brightening details with the Dodge tool
      7m 49s
    9. Darkening details with the Burn tool
      3m 5s
    10. The Sponge tool
      4m 29s
    11. Backing off edits
      8m 4s
    12. Patching eye bags
      8m 57s
    13. Evening out flesh tones
      7m 23s
    14. Smoothing away whiskers
      7m 41s
    15. Reducing shadow noise
      7m 0s
    16. How healing works
      4m 40s
    17. The enhanced Spot Healing brush
      4m 52s
    18. Using the better Healing brush
      4m 23s
    19. Introducing the Clone Source panel
      3m 49s
    20. Cloning from one layer to another
      5m 30s
    21. Working with multiple sources
      4m 44s
  11. 1h 23m
    1. The layered composition
      1m 0s
    2. Making a new background layer
      6m 58s
    3. Working with "big layers"
      6m 24s
    4. Move, Duplicate, and Scale
      4m 11s
    5. Transforming a copy and repeat
      5m 15s
    6. Stacking order and eyedropping a layer
      5m 15s
    7. Adjusting multiple layers at once
      4m 22s
    8. Switching between layers
      4m 56s
    9. Making a digital star field
      5m 9s
    10. Blend mode and clipping mask
      4m 50s
    11. Dragging and dropping from your desktop
      4m 38s
    12. Black + Lens Flare = glow
      6m 16s
    13. Locking transparency
      5m 42s
    14. Adding gradient layers
      8m 12s
    15. Stacking an adjustment layer
      4m 12s
    16. Adding shadow and stroke
      6m 9s
  12. 1h 17m
    1. Outputting from Photoshop and Bridge
      1m 32s
    2. Printing an RGB composite
      5m 31s
    3. Customizing the subjective print file
      3m 15s
    4. Gauging print size
      5m 35s
    5. Scale, position, and page orientation
      5m 6s
    6. Three important printing curiosities
      4m 41s
    7. Introducing the Output options
      5m 34s
    8. Establishing a bleed
      5m 52s
    9. Using the Color Management options
      7m 21s
    10. Generating a PDF contact sheet
      6m 18s
    11. Creating a contact sheet template
      6m 8s
    12. Saving and opening a PDF contact sheet
      4m 18s
    13. Introducing the Web Gallery
      7m 53s
    14. Exporting and editing an HTML site
      3m 58s
    15. The Airtight Photocard site
      4m 56s
  13. 1h 9m
    1. Rules of the web
      1m 1s
    2. Introducing web graphics
      6m 59s
    3. A first look at Save for Web
      5m 47s
    4. Scaling a layered image versus a flat one
      7m 30s
    5. Incremental downsampling
      3m 1s
    6. Adding text, bar, and stroke
      4m 24s
    7. Assigning copyright and metadata
      6m 21s
    8. Comparing GIF, JPEG, and PNG
      4m 59s
    9. Determining the perfect JPEG settings
      6m 31s
    10. Saving metadata
      3m 52s
    11. Working with an unprofiled RGB image
      4m 35s
    12. Downsampling graphic art
      4m 49s
    13. Saving a GIF graphic
      6m 1s
    14. Antiquated GIF versus the better PNG
      4m 6s
  14. 1m 37s
    1. Until next time
      1m 37s

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