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Downsampling advice

From: Photoshop CC One-on-One: Fundamentals

Video: Downsampling advice

In this movie, I'll provide you with some insights for which Interpolation settings to apply when when downsampling an image inside Photoshop. So what I've done is I've created a diagram in which I went up to the Image menu and chose the Image Size command. And then, with the Resample checkbox turned on, I reduced the width value to 25%. And as long as I'm here, I want to provide you with little trick. Normally, notice this, if I switch from something like Percent to Pixels, then (LAUGH) I'm going to reduce the image quite a bit here.

Downsampling advice

In this movie, I'll provide you with some insights for which Interpolation settings to apply when when downsampling an image inside Photoshop. So what I've done is I've created a diagram in which I went up to the Image menu and chose the Image Size command. And then, with the Resample checkbox turned on, I reduced the width value to 25%. And as long as I'm here, I want to provide you with little trick. Normally, notice this, if I switch from something like Percent to Pixels, then (LAUGH) I'm going to reduce the image quite a bit here.

Because I've changed its width to 25 pixels, but that also ends up changing the height. I'll go ahead and set that back to Percent, so we get the results I'm looking for. And if you want to change the unit associated with width or height independently, then you want to press the Shift key and click on this option. And then, I'll choose Pixels for height here, and we can see now that the height of the image is going to be 706 pixels. Anyway, the larger point is that I downsampled the image to 25%, and then I applied each one of these various interpolation setting. I got that already in a second file.

So go ahead and switch over to it here. And I'll zoom in as well, and I've got some Layer comps set up in advance so that I can just toggle through the Layers through the keyboard. This is the result of downsampling the image using nearest neighbor. So all that does is it just throws away pixels, and as a result, we get some very jagged transitions. Can't really think of any reasons why'd you want to use nearest neighbor for downsampling, but there it is and this here is Bilinear. So we end up getting the smoothest transitions between the various pixels.

This next one is Bicubic. And, let me go ahead and zoom in a little farther here, because the difference between these interpolations is a little bit subtle. So again, this was Bilinear. And now, this is Bicubic. We have a little more definition associated with the details this time around. If you feel like you are getting too much sharpness then you can back it off with Bicubic smoother, which actually does a good job of defeating noise inside of an image.

So if you have random variation between neighboring pixels, that are not really representative of the scene analogous to film grain, then you can help defeat those with that setting. And then if you want more sharpness then you go with Bicubic Sharper, and in that case, we saw pretty big increase in the sharpness of the detail there. And then finally, preserve details, which I have to admit, this is it. And if you didn't notice any difference there, it isn't because you're not looking hard enough, it's because there is no difference.

Pixel for pixel, this effect is absolutely identical. So, what's the upshot? Well, I'll go ahead and zoom out here, by pressing Ctrl+0, Cmd+0 on a Mac. Here's my advice, my rules for downsampling. For starters here, when in doubt, stick with Automatic, because that's going to go ahead and apply Bicubic Sharper. However, if you plan on later sharpening the image after you downsample, and I do this a lot. And I'll be devoting an entire chapter to sharpening by the way in the intermediate course.

At which point, we'll discuss these two commands right here Unsharp Mask and Smart Sharpen, both of which give you lots of control. And so, if you plan on going that route, then you don't want to sharpen on top of an already Sharp effect, because you'll be adding halos to halos. So instead, in that case, you want to use the standard Bicubic setting, which is called inside the Image Size dialog bo. It's called Bicubic, and in parentheses, smooth gradients. This is also a good idea if you think there's any chance that you're going to downsample an image more than once.

Next, if the image is noisy, as I say, random variations between neighboring pixels, then, go ahead and try Bicubic Smoother and see if that doesn't give you better results. And then finally, if the results end up looking jagged, I've had this happen on a few graphics that I've created for the web recently, where a very fragile detail ends up looking quite jagged, then you want to use Bilinear instead, because, it's just a straight averaging computation.

And it's going to give you the smoothest results possible, but of course, my biggest word of advice is that you never downsample and save over your original file. Always duplicate the image first, before you downsample so that the original file is safe. So there's my advice for downsampling, hopefully, it will help you achieve the best results possible when you're working inside your own images.

Show transcript

This video is part of

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

102 video lessons · 21074 viewers

Deke McClelland
Author

 
Expand all | Collapse all
  1. 35m 44s
    1. Welcome to One-on-One
      1m 51s
    2. Opening from the Windows desktop on Windows 8 NEW
      6m 16s
    3. Opening from the Windows desktop on Windows 7 or earlier UPDATED
      5m 48s
    4. Opening from the Macintosh Finder UPDATED
      7m 10s
    5. Opening from Photoshop or Bridge
      3m 52s
    6. Opening through Camera Raw
      5m 11s
    7. Closing one image and closing all UPDATED
      5m 36s
  2. 52m 47s
    1. Navigating your image
      40s
    2. The dark vs. the light interface UPDATED
      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 UPDATED
      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 UPDATED
      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 UPDATED
      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 UPDATED
      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 UPDATED
      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 UPDATED
      6m 11s
    3. Using the Spot Healing Brush
      5m 36s
    4. The more capable "standard" Healing Brush UPDATED
      5m 55s
    5. Meet the Clone Source panel
      3m 53s
    6. Caps Lock and Fade
      4m 57s
    7. The Dodge and Burn tools UPDATED
      5m 1s
    8. Adjusting color with the Brush tool UPDATED
      6m 35s
    9. Smoothing skin textures UPDATED
      5m 57s
    10. Brightening teeth
      4m 0s
    11. Intensifying eyes UPDATED
      4m 43s
  11. 49s
    1. Until next time UPDATED
      49s

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