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Downsampling for email

From: Photoshop CC One-on-One: Fundamentals

Video: Downsampling for email

In this movie, I'll show you how to downsample an image with the intention of emailing it or posting it to a photo sharing or social media site, something along the lines of Google Plus or Facebook, Twitter, Flickr, there's a bunch of them out there. And mostly, the idea is to reduce the size of the file on disk to 5 megabytes or less is usually a good goal. And you also don't want the image to be so big that it can't be viewed on the largest monitor out there. Now, currently, I'm seeing this image, which is a panorama of Moab, Utah from the Fotolia image library, and I'm looking at this image at the 17% view size. It happens to be 7,000 pixels wide, and it's about 20 megapixels in all. Plus, it takes up 12.8 megabytes on disk as a compressed JPEG file. So we definitely want to trim things down, by first going up to the Image menu and choosing the Duplicate command, just so we don't ruin the original. And I should have mentioned this before, if your image contains layers, you can just turn on this checkbox, Duplicate Merged Layers Only, and that'll give you a flat file.

Downsampling for email

In this movie, I'll show you how to downsample an image with the intention of emailing it or posting it to a photo sharing or social media site, something along the lines of Google Plus or Facebook, Twitter, Flickr, there's a bunch of them out there. And mostly, the idea is to reduce the size of the file on disk to 5 megabytes or less is usually a good goal. And you also don't want the image to be so big that it can't be viewed on the largest monitor out there. Now, currently, I'm seeing this image, which is a panorama of Moab, Utah from the Fotolia image library, and I'm looking at this image at the 17% view size. It happens to be 7,000 pixels wide, and it's about 20 megapixels in all. Plus, it takes up 12.8 megabytes on disk as a compressed JPEG file. So we definitely want to trim things down, by first going up to the Image menu and choosing the Duplicate command, just so we don't ruin the original. And I should have mentioned this before, if your image contains layers, you can just turn on this checkbox, Duplicate Merged Layers Only, and that'll give you a flat file.

In my case, I already have a flat file, however. So I'm just going to call this guy Downsampled Moab, like so. And then I'll click OK. And I've now got a copy of the image. The next step, of course, is to go up to the Image menu and choose the Image Size command. And notice the dimensions here, 7000 pixels by 2800. And we've also got an uncompressed file size of 56 and a half megabytes in RAM. This is a ginormous image. Now, when I'm downsampling images just for whatever web purpose I might have and I'm not sure exactly what size I want the final file to be. Because, sometimes, you know exactly the pixel dimensions you want, but generally you don't, and so, I'll usually switch here from Inches to Percent. And just figure that I'll take the file size down to some percentage, maybe start at 50% and see what you end up with.

And that's going to give me an image size of 14 megabytes in RAM, which is pretty darn big. Now, you can figure that when you save the JPEG file, it's not going to be much more than a third of that. But, it's going to vary depending on a detail inside the file and you also want to pay attention to the dimensions. Notice that the final is still 3500 pixels wide and nobody out there owns a screen that's that big. In fact, very few people own screens that are more than 2000 pixels wide.

So we need to take the file size down farther. I'm going to try 33% and see what we get. Now, that's going to give me 2300 hundred pixels wide, a little bit of change there. And we're coming up on a 1000 pixels tall, which seems about as big as I want this to be. Now, I want to show you something, you may not be able to see this in the video, but when I drag the image it looks a little bit jagged, and when I release it gets all smooth. Check this out, when you're downsampling images things behave differently than when you're upsampling, here inside the Preview.

I'm going to go ahead and zoom in by clicking this Plus button to 300%. And notice we're getting big pixels, because after all, we're zooming in beyond 100%. But if I click and hold, the image looks better. So in other words, it looked better before I downsampled it than it looks after. So, Photoshop is going to show you the original version of the image. Perhaps a little bit jagged, however, in my case, it's not jagged in the least when I click and hold. It gets jagged only after I release and that's because 33% here, times three ends up giving us a 100%.

So in other words, this is our 100% view of the original image when I click and hold. All right, so, that pretty much takes care of it. We've gotten the image size and RAM down to 6 megabytes, which is definitely in the clear. Again, the JPEG file probably going to be about a third that size. So now, what you want to do is go ahead and click OK in order to downsample that image. And you can see, it's much smaller on screen. But if I press Ctrl+1 or Cmd+1 on a Mac in order to zoom in 100%, it's still plenty gargantuan on this screen. All right, now, what you want to do is save off the file as a JPEG image. And you do that by going up to the File menu, and choosing either the Save or Save As command, doesn't matter, because this file has not been saved yet. I'll just go ahead and choose Save or you can press Ctrl+S or Cmd+S on the Mac, and you can see, I've already provided you with a file called Downsampled Moab.jpeg. I'm going to go ahead and replace it right now, and I'll click on the Save button, and click Yes to replace the image.

And then, you'll see the JPEG Options dialog box. What I recommend you do is always, always, always save at the maximum quality setting. Don't take it down to, I believe 8 is the default and that's just going to mess up the image. That's going to apply too much compression and it's just not worth it, so many people make that mistake with their web images, they overcompress and it just destroys the experience in my opinion. Go ahead and crank it all the way up at a quality setting of 12, which is the highest inside this dialog box, you end up getting JPEG compression that you cannot even see, you're not going to notice a difference.

And you get this little preview that tells you that your file's going to be 1.9 megabytes. Now, that's an approximation. It may be a little off, but it's going to be somewhere around there, and then you also want to turn on baseline optimize, because that's going to apply lossless compression as well. It may not make a difference in terms of the file size, but sometimes, it does and it's worth it. And then you want to go ahead and click OK in order to save off that file. And now, it's ready to email. You can typically email images 10 megabytes or smaller.

And you could certainly post this on any of the sites out there. So that's how you downsample an image for email, as well as any variety of online photo sharing here 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 · 29023 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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