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Downsampling for the web

From: Photoshop CC One-on-One: Intermediate

Video: Downsampling for the web

In this movie, I'll show you the best way to down-sample an image for the Web. I'm working inside a file called Big Venice panorama, and it's a much larger version of that banner art. So, what I'd like to do is have that smaller file load by default, and then if somebody clicks on it. They'll see a larger version of this image, but not this large. If you click and hold down this doc item down here in the lower left corner of the window, you'll see the width of this image is 4802 pixels, which wouldn't even fit on the biggest retina display out there.

Downsampling for the web

In this movie, I'll show you the best way to down-sample an image for the Web. I'm working inside a file called Big Venice panorama, and it's a much larger version of that banner art. So, what I'd like to do is have that smaller file load by default, and then if somebody clicks on it. They'll see a larger version of this image, but not this large. If you click and hold down this doc item down here in the lower left corner of the window, you'll see the width of this image is 4802 pixels, which wouldn't even fit on the biggest retina display out there.

So there's no sense in providing this many pixels with my web art. Fortunately, you can down sample your image from the save for web dialogue box, unfortunately, it doesn't do a very good job. So, we'll start things off by going up to the File menu and choosing Save for web. This is a continuous tone image, so I don't want to work with the PNG eight format. I want JPEG instead. So I'll go ahead, and select JPEG like so, and next what I want to do is reduce the size of my image to 33%, and that's going to affect both the width and height values as well, and I'll go ahead, and scroll my artwork like so.

And zoom in a couple of clicks here by pressing Ctrl + Plus or Cmd + Plus on the Mac. Now notice this quality setting. We do have control over the interpolation theoretically anyway. And for example, nearest neighbor works just fine. If you select it you'll end up with these jagged transitions. As were seeing here, both in the optimized Jpeg view. And in the original view, which doesn't really make any sense, but that's the way it is. Whereas the other options all do the same thing. So notice if I switch to Bilinear, which provides the smoothest interpolation.

And then I'll go ahead and switch to Bicubic Sharper, which is the sharpest interpolation. Keep an eye on this boat on screen here. Notice when I chose by cubic sharper, nothing happens. And so, if you really do want control over the interpolation, you have to down sample the image using the Image Size command instead. Which is exactly what I'm going to do. So, I'll go ahead and click on the cancel button in order to cancel out of this dialog box. And then, I'll press shift tab in order to bring up my right side panels and notice I have a couple of adjustment layers at work.

Before you scale your image for the web. You're best off flattening it which means that you want to duplicate the image before you start by going up to the Image menu and choosing the Duplicate command. And I'll go ahead and accept this default name and turn on duplicate merge layers only, in order to create a flat version the file as we see here. And I'm going to create another copy, so that we can compare couple of different interpolation methods and see how things ought to work inside Safer Web, by choosing the Duplicate command once again.

And this time, I don't have to select this check box. In fact, it's dimmed because the image is already flat. And I'll go ahead and accept it as well. All right. Now, with the second copy open, I'll go up to the Image menu and choose the Image Size command. And I've got this thing set up so its taking up the entire screen. Notice that my width and height values is set to percent and so I'll just go ahead and take the width value down to 33% and I'll change resample so we can see the difference here, to bi linear. And you don't need to worry about the resolution value by the way. That has no effect on web graphics.

So just go ahead and click OK in order to down sample that image. And it's going to appear quite small by comparison to the way it did before. And I'm going to zoom in on that boat this little bit and I'll switch over to the first copy, go up to the image menu, choose image size again, dial in 33% for the with value and we want both the width and height values to be the linked together, by the way. And now I'll change resample to automatic which when downsampling the image, as were doing here, goes ahead and automatically assigns by keeping sharper.

And now I'll click okay. And I'll go ahead and zoom in on this graphic as well. Alright now let's take a look at these images. Actually I'm going to zoom in quite a bit on the bi-linear version. By pressing control plus or command plus. Let's say until we get to 400%. And then I'll go up to the window menu. Choose a range. And choose match all. So that we'll have alignment between our two images. So this is an example of bilinear interpolation, and this is an example of bicubic sharper, which is going to work better for our purposes.

So with this image selected. Go ahead and zoom out a little bit, so I can take it in the way it was meant to be viewed at 100%. And then, I'll go up to the file menu and choose Save for web. I need to once again switch from PNG eight to JPEG because I cancelled out of the dialogue box last time around. And, I'll go ahead and scroll over to the boat, I suppose. This time around, we do not need to modify the image size. It's already been modified so we'll leave that option alone. Now, by default, the quality setting is going to be set to high.

Which in my case, will generate a JPEG file that's 284 k. Which means that it's going to take four seconds to download at one megabit per second. But presumably people want to see a good version of this file. Because after all they clicked on the small thumbnail. So I'm going to take the quality up to very high. Which will generate a file that's almost 500 k. But again the people want it. So it seems like the right way to go. Now click the save button. And I'll go ahead and truncate the name here a little bit by getting rid of the word copy.

Other wise the settings are just fine as is. And then I'll click the Save button, in order to save off the optimized jpeg version of that graphic. And that's the best way to down sample a web graphic, using the Image Size command as opposed to Safer Web. Here inside photo shop.

Show transcript

This video is part of

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

119 video lessons · 9405 viewers

Deke McClelland
Author

 
Expand all | Collapse all
  1. 2m 4s
    1. Welcome to One-on-One
      2m 4s
  2. 29m 46s
    1. The best of Photoshop automation
      35s
    2. Introducing the Patch tool
      3m 43s
    3. Using Content-Aware Patch
      5m 42s
    4. Retouching with Content-Aware Patch
      2m 5s
    5. Using the Content-Aware Move tool
      3m 9s
    6. Using Content-Aware Extend
      2m 4s
    7. The Content-Aware Scale command
      6m 35s
    8. Scaling in multiple passes
      2m 22s
    9. Protecting skin tones
      3m 31s
  3. 32m 55s
    1. Editing the histogram
      1m 50s
    2. The new automatic Levels adjustment
      4m 33s
    3. Customizing a Levels adjustment
      4m 53s
    4. Understanding the Gamma value
      2m 7s
    5. Opening up the shadows
      2m 48s
    6. Previewing clipped pixels
      3m 40s
    7. Retouching with Output Levels
      4m 25s
    8. Making channel-by-channel adjustments
      2m 19s
    9. Faking a gray card in post
      2m 51s
    10. Assigning shortcuts to adjustment layers
      3m 29s
  4. 57m 43s
    1. How sharpening works
      1m 38s
    2. Introducing the Smart Sharpen filter
      6m 56s
    3. Understanding the Radius value
      5m 20s
    4. Gauging the best sharpening settings
      5m 45s
    5. Addressing color artifacts and clipping
      5m 49s
    6. The Remove and Reduce Noise options
      4m 22s
    7. The Shadows/Highlights options
      7m 36s
    8. Correcting for camera shake
      6m 47s
    9. Sharpening with the Emboss filter
      5m 45s
    10. Sharpening with the High Pass filter
      4m 44s
    11. Painting in sharpness
      3m 1s
  5. 1h 9m
    1. Vector-based type
      1m 35s
    2. Creating and editing point text
      5m 58s
    3. Font and type style tricks
      7m 10s
    4. Type size and color tricks
      6m 42s
    5. Kerning and tracking characters
      8m 7s
    6. Creating and editing area text
      3m 50s
    7. Selecting and formatting paragraphs
      6m 36s
    8. Setting text inside a custom path
      5m 32s
    9. Creating text along a path
      6m 12s
    10. Adjusting baseline shift
      4m 45s
    11. Creating and stylizing a logo
      6m 49s
    12. Masking text into image elements
      6m 14s
  6. 57m 13s
    1. The other vector-based layer
      1m 39s
    2. Dotted borders and corner roundness
      8m 14s
    3. Drawing and aligning custom shapes
      3m 55s
    4. Creating your own repeatable custom shape
      5m 43s
    5. Selecting paths and isolating layers
      4m 11s
    6. Combining simple shapes to make complex ones
      5m 59s
    7. Cropping, adjusting, and merging shapes
      5m 50s
    8. Creating a soft, synthetic sparkle
      6m 22s
    9. Saving a resolution-independent PDF file
      6m 42s
    10. Turning a small image into a huge one
      8m 38s
  7. 1h 14m
    1. Depth, contour, and texture
      1m 28s
    2. Imparting depth with a layer effect
      9m 9s
    3. The power of the drop shadow
      7m 37s
    4. Modifying a layer and its effects
      6m 21s
    5. Saving custom default settings
      4m 12s
    6. Creating a custom contour
      8m 5s
    7. Introducing Bevel and Emboss
      8m 8s
    8. Multiple effects and multiple layers
      7m 45s
    9. Global Light and rasterizing effects
      8m 5s
    10. Gloss and surface contour
      6m 4s
    11. Adding texture to Bevel and Emboss
      7m 21s
  8. 34m 48s
    1. Styles store settings
      1m 38s
    2. Creating and applying a paragraph style
      3m 41s
    3. Redefining a style and styling a word
      5m 38s
    4. Creating and styling a placeholder style
      5m 43s
    5. Applying and creating layer styles
      5m 45s
    6. Loading and customizing layer styles
      5m 42s
    7. Merging and saving layer styles
      6m 41s
  9. 56m 48s
    1. Meet the transformations
      1m 55s
    2. Transformations and Smart Objects
      5m 46s
    3. Adjusting the interpolation setting
      5m 10s
    4. Rotating a layer with Free Transform
      5m 22s
    5. Scale, duplicate, and repeat
      4m 30s
    6. Creating a synthetic star field
      5m 20s
    7. Warping a logo with Arc and Flag
      5m 34s
    8. Distort, perspective, and skew
      4m 15s
    9. Using transformations to draw and correct
      7m 0s
    10. Bolstering text with layer effects
      5m 43s
    11. Adding highlights with Lens Flare
      6m 13s
  10. 43m 36s
    1. Removing the weight that the camera adds
      1m 7s
    2. The Warp and Reconstruct tools
      6m 44s
    3. Brush size, hardness, and opacity
      4m 29s
    4. The Pucker, Bloat, Push, and Twirl tools
      7m 12s
    5. Saving and reapplying Liquify settings
      4m 9s
    6. Lifting and slimming details
      9m 42s
    7. Warping legs, arms, and fabric
      5m 33s
    8. Improving a model's posture
      4m 40s
  11. 58m 46s
    1. Shoot in color, convert to black and white
      1m 55s
    2. Three ways to grayscale
      5m 36s
    3. Mixing a custom black-and-white image
      7m 31s
    4. Simulating an infrared photograph
      6m 39s
    5. Creating a sienna-infused sepia tone
      5m 38s
    6. Creating a hyper-saturated image
      5m 26s
    7. Introducing the Black & White command
      3m 16s
    8. Customizing the Black & White settings
      4m 50s
    9. Black & White meets the Channel Mixer
      7m 29s
    10. Infusing an image with tint and color
      5m 9s
    11. Grayscale and Split Tone in Camera Raw
      5m 17s
  12. 41m 34s
    1. The many ways to print
      1m 41s
    2. Using the test document
      3m 18s
    3. Print, position, and size
      5m 57s
    4. Description and printing marks
      3m 3s
    5. Establishing a bleed
      3m 44s
    6. Getting reliable color
      5m 54s
    7. Special printing options
      5m 1s
    8. Previewing an image at print size
      4m 16s
    9. Creating contact sheets
      4m 49s
    10. Creating a multipage PDF
      3m 51s
  13. 31m 9s
    1. Making Internet imagery
      1m 6s
    2. Introducing Save for Web
      4m 39s
    3. Creating the perfect JPEG image
      5m 14s
    4. Creating a high-contrast GIF image
      6m 23s
    5. The two varieties of PNG
      3m 57s
    6. Downsampling for the web
      5m 59s
    7. Adding copyright and contact info
      3m 51s
  14. 1m 3s
    1. Until next time
      1m 3s

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