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Resolution and Smart Filter radius

From: Photoshop CS4 One-on-One: Mastery

Video: Resolution and Smart Filter radius

In this exercise, we're going to explore the tricky relationship between Smart Filters and Image Resolution. This is a really interesting and somewhat technical topic. I'm going to try to make it make sense; I think you'll be able to follow along here. Now the idea is this. You may recall, back when we were talking about the sharpening filters back in Chapter 14 and the blurring and averaging filters in Chapter 15, that any filter that includes radius value, you're modifying that radius value to accommodate the number of pixels inside the image. In all the filters that we've assigned to this image so far, Smart Sharpen, Median and High Pass, they all include radius values. I've gone ahead and saved my progress incidentally, Large Filter comp.psd.

Resolution and Smart Filter radius

In this exercise, we're going to explore the tricky relationship between Smart Filters and Image Resolution. This is a really interesting and somewhat technical topic. I'm going to try to make it make sense; I think you'll be able to follow along here. Now the idea is this. You may recall, back when we were talking about the sharpening filters back in Chapter 14 and the blurring and averaging filters in Chapter 15, that any filter that includes radius value, you're modifying that radius value to accommodate the number of pixels inside the image. In all the filters that we've assigned to this image so far, Smart Sharpen, Median and High Pass, they all include radius values. I've gone ahead and saved my progress incidentally, Large Filter comp.psd.

Now if these were flat adjustments and we changed the number of pixels inside of the image, the results of our filters, specifically our radius values, would scale along with the image. But that doesn't happen when we're working with Smart Filters. Okay, so what am I talking about? We're going to make two duplicates of this image. I'm going to go up to the Image menu and I'm going to choose the Duplicate command. I'm going to call this one, Flattened image. And then I'll go ahead and click OK. I'll zoom in a little bit here so that we're seeing our two images at the same zoom ratio. I'm going to go ahead and commit the filters to the image in one of two ways. I could go up to the Layer menu and I could choose the Flatten Image command, and that's going to completely flatten the image and get rid of the Smart Object and the filters. It's going to wrap all of those operations into the flattened image. So the image isn't going to look any different, it's going to look the same as it did before. That's one way to work.

If for some reason you want to keep that layer though, you can also do this. I'll press Ctrl+Z, Command+Z on the Mac. You can go to your Smart Object layer there, right-click in an empty portion of the layer, not on the thumbnail, choose Rasterize Layer and that's going to go ahead and rasterize everything out, but you still have an independent layer that you can turn on and off. Now that this is a flat version of the image, I've committed the filters. I'm going to go ahead and re-sample the image to 50% of its former size. So I'll go up to the Image menu, choose the Image Size command, Ctrl+Alt+I, Command+Option+I on the Mac, and I'll switch to percent and I'll change the percent value to 50%. We don't care about the resolution or any of this jazz, we do want all the checkboxes on and we do want the Interpolation Method set to Bicubic (best for smooth gradients). Click OK, and then I'll go ahead and zoom the image to 100%, and now let's compare our two images.

This is the high-resolution image here with all the Smart Filters assigned to it, and this is the lower resolution image, which has been rasterized. They look for all intents and purposes because we've zoomed out the 50% image so that we can't see all of its pixels. So they both look the same on screen. This is very important. So compare this to what would happen if we had not rasterized the layer. So I'll go up to the Image menu, with Large filter comp selected and I'll choose Duplicate. I'll call this one Small filter comp, and I'll get rid of word copy, we don't need that. I'll click OK. I'll zoom in to 50% so that we're seeing the image at the same zoom ratio.

I'm not going to flatten the image. I'm going to leave it alone; I'm going to leave my Smart Filters and my Smart Object intact. I'm going to go up to the Image menu; I'm going to choose the Image Size command again. I'm going to change the percent value to 50%, all checkboxes on, Bicubic (best for smooth gradients). So the exact same thing we saw just a moment ago. Now notice that there is this checkbox that scales the styles. That means that it scales things like Drop Shadows and Glows and all that good stuff, Bevel and Emboss. It will go ahead and scale those to half of their former size.

If we had a Drop Shadow going on, that was a 14 pixel Drop Shadow. Well, this checkbox would automatically scale it to a 7 pixel Drop Shadow. However, notice that there is nothing here about Smart Filters. Smart Filters do not get scaled. So I'll click OK and we'll go ahead and zoom into 100%, looks a lot different. So this is the original comp right there and this is the flattened version of the image at 50% and this is the unflattened Smart Object version of the image at 50%. Do you see the difference? This is what happens when we scale the effects of the filters. This is what happens when you don't scale the effects of the filters. So all of our effects are thicker. So what do you have to do? If you're going to work this way, if you're going to go ahead and keep your Smart Filters as you downsample an image or upsample for that matter.

You're just not going to upsample as often, hopefully. But if you decide to go that route and keep your Smart Filters, then you're going to have to follow up. If you want to keep the same effects, you're going to have to manually adjust every single one of your Smart Filters to taste so that you have lower radius values. So, for example, I would go over here to my Smart Sharpen filter, double-click on it, in order to bring up the Smart Sharpen dialog box. I would change the Radius value, not Amount. Amount is fine. It does not need to be scaled. Radius does need to be scaled. I'll take that down to 2 pixels, half of its former 4 pixels, and I'll click OK.

Then I would change the Median value, but if I double-click on Median right now, it's going to get grumpy on me, right? It's going to bring up an alert message anyway, just to warn me what's going on. I'll just escape out of there. A way around this is to actually move Median to the top of the stack. If you want to be able to see the effects of all the filters at that same time, you can just temporarily move Median up and then double-click on it. Then change its Radius value to half of what it was before, 10 pixels instead of 20, click OK. Then let's go ahead and move High Pass up to the top of the stack. We need to change it as well. I'll double-click on it, change its value to half of what it was before, 25 instead of 50, click OK, and then move everybody back to where they need to be, Medium below Smart Sharpen and High Pass below Median. Then we would expect the effects to look the same as they do in the other images, let's check.

I'll Ctrl+Tab or Command+Tilde over to the Large layer comp. I'll Ctrl+Tab or Command+Tilde over to the Flattened image, and I'll Ctrl+Tab or Command+Tilde over to the Small filter comp. They all look the same on screen. So just bear in mind, if you're going to downsample your image with the Smart Filters still assigned, you're going to have to adjust your Radius values and only your Radius values, anything that's spreading out in edge, where Filters are concerned, here inside Photoshop.

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This video is part of

Image for Photoshop CS4 One-on-One: Mastery
Photoshop CS4 One-on-One: Mastery

147 video lessons · 27717 viewers

Deke McClelland
Author

 
Expand all | Collapse all
  1. 21m 17s
    1. Welcome
      1m 21s
    2. Installing the DekeKeys keyboard shortcuts
      5m 38s
    3. Resetting the Function keys on a Mac
      3m 51s
    4. Installing the CS4 color settings
      4m 34s
    5. Setting up the CS4 color settings
      5m 53s
  2. 2h 31m
    1. Introduction to masking
      51s
    2. Introducing color range
      4m 22s
    3. Adding base colors and adjusting fuzziness
      4m 46s
    4. Localized color clusters
      6m 12s
    5. The Quick Mask mode
      7m 33s
    6. Viewing a quick mask by itself
      6m 40s
    7. Testing the quality of edges
      3m 55s
    8. Introducing the Masks palette
      7m 45s
    9. Editing a layer mask
      6m 18s
    10. Choking a mask with Gaussian Blur and Levels
      6m 44s
    11. Choking a mask with Mask Edge
      7m 43s
    12. Adding a Gradient Overlay shadow
      4m 23s
    13. Using live Density and Feather
      6m 12s
    14. Journeyman masking
      5m 44s
    15. Creating an alpha channel
      7m 6s
    16. Increasing contrast
      7m 15s
    17. Overlay painting
      8m 28s
    18. Cleaning up whites and blacks
      5m 48s
    19. Soft light painting
      5m 47s
    20. Selecting in style
      6m 55s
    21. Employing masks as selections
      5m 2s
    22. Scaling and compositing layers
      6m 30s
    23. Compositing glass
      5m 10s
    24. Selecting glass highlights
      8m 41s
    25. Working with found masks
      5m 46s
  3. 1h 34m
    1. Introduction to vector-based shapes
      1m 10s
    2. Vector-based type outlines
      7m 23s
    3. The benefits of vectors
      6m 27s
    4. Upsampling vs. nondestructive scaling
      7m 35s
    5. Vectors and effects
      8m 7s
    6. Fill Opacity and clipped layers
      4m 24s
    7. Basic shape creation
      3m 15s
    8. Drawing interacting shapes
      6m 21s
    9. Power-duplicating paths
      3m 12s
    10. Combining pixels and vector masks
      5m 19s
    11. Line tool and layer attributes
      7m 5s
    12. Copying and pasting path outlines
      3m 28s
    13. Drawing custom shapes
      3m 59s
    14. Drawing with the Pen tool
      7m 48s
    15. Creating cusp points
      7m 28s
    16. Defining a custom shape
      3m 34s
    17. Assigning a vector mask to an image
      2m 38s
    18. Adding a vector object to a composition
      5m 40s
  4. 1h 23m
    1. Introduction to Vanishing Point
      1m 11s
    2. Creating and saving the first plane
      8m 9s
    3. Creating perpendicular planes
      5m 16s
    4. Healing in perspective
      8m 47s
    5. Cloning and scaling in perspective
      8m 33s
    6. Patching an irregularly shaped area
      6m 59s
    7. Healing between planes
      3m 34s
    8. Importing an image into a 3D scene
      5m 45s
    9. Adding perspective type
      5m 37s
    10. Removing and matching perspective
      5m 36s
    11. Applying a reflection in perspective
      5m 1s
    12. Creating a perspective gradient
      6m 11s
    13. Converting a gradient to a mask
      2m 58s
    14. Swinging planes to custom angles
      4m 32s
    15. Wrapping art around multiple surfaces
      5m 49s
  5. 1h 15m
    1. Introduction to Smart Objects
      58s
    2. Placing a Smart Object
      5m 7s
    3. Saving a PDF-compatible AI file
      4m 27s
    4. Performing nondestructive transformations
      6m 7s
    5. Editing a Smart Object in Illustrator
      6m 50s
    6. Converting an image to a Smart Object
      6m 50s
    7. Cloning Smart Objects
      5m 24s
    8. Creating a multilayer Smart Object
      5m 51s
    9. Updating multiple instances at once
      2m 54s
    10. Creating a Camera Raw Smart Object
      4m 17s
    11. Editing a Camera Raw Smart Object
      3m 25s
    12. Assembling a layered ACR composition
      5m 54s
    13. Using an ACR Smart Object to effect
      3m 41s
    14. Blending multiple ACR portraits
      6m 56s
    15. Live type that inverts everything behind it
      6m 32s
  6. 1h 48m
    1. Introducing nondestructive Smart Filters
      46s
    2. Applying a Smart Filter
      4m 22s
    3. Adjusting filter and blend settings
      4m 25s
    4. Heaping on the Smart Filters
      5m 19s
    5. Smart Filter stacking order
      7m 23s
    6. Resolution and Smart Filter radius
      6m 12s
    7. Masking Smart Filters
      4m 41s
    8. Employing nested Smart Objects
      5m 5s
    9. Dragging and dropping Smart Filters
      6m 31s
    10. Using the Shadows/Highlights filter
      5m 53s
    11. Regaining access to the pixels
      7m 8s
    12. Parametric wonderland
      5m 52s
    13. Working with the Filter Gallery
      6m 28s
    14. Freeform filter jam
      5m 51s
    15. Swapping filters from the Filter Gallery
      3m 45s
    16. Mixing all varieties of parametric effects
      7m 30s
    17. Addressing a few Smart Filter bugs
      3m 11s
    18. Applying a Smart Filter to live type
      5m 30s
    19. Choking letters with Maximum
      3m 7s
    20. Duplicating a Smart Filter
      2m 38s
    21. Enhancing a filter with a layer effect
      6m 30s
  7. 1h 6m
    1. Introduction to Auto-Align, Auto-Blend, and Photomerge
      1m 2s
    2. Merging two shots into one
      3m 49s
    3. Applying Auto-Align layers
      3m 44s
    4. Masking images into a common scene
      1m 38s
    5. Auto-Align plus Auto-Blend
      8m 11s
    6. Assigning weighted Opacity values
      4m 7s
    7. Employing a Difference mask
      7m 17s
    8. Masking smarter, not harder
      3m 53s
    9. Capturing multiple depths of field
      3m 37s
    10. Auto-blending real focus
      8m 31s
    11. Creating a panorama with Photomerge
      7m 27s
    12. Correcting a seamless panorama
      4m 52s
    13. An altogether nondestructive Lab correction
      7m 59s
  8. 1h 44m
    1. Introduction to new CS4 technologies
      1m 1s
    2. Applying Content-Aware Scale
      7m 18s
    3. What works and what doesn't with Content-Aware Scale
      4m 19s
    4. Protecting areas with masks
      7m 31s
    5. Applying incremental edits
      7m 6s
    6. Protecting skin tones
      7m 12s
    7. Scaling around a model with TLC
      9m 0s
    8. Adjusting the scale threshold
      5m 22s
    9. When Content-Aware Scale fails
      4m 2s
    10. Creating a lens distortion effect
      8m 39s
    11. Layer masking the family
      11m 44s
    12. Installing the Pixel Bender
      3m 42s
    13. Introducing Pixel Bender kernels
      6m 50s
    14. Pixel Bender kernel roundup
      7m 24s
    15. Tube View and Ripple Blocks
      3m 58s
    16. Making a seamless pattern with Kaleidoscope
      6m 13s
    17. Introducing the Pixel Bender Toolkit
      3m 24s
  9. 1h 20m
    1. Introduction to actions
      42s
    2. Creating an action
      5m 45s
    3. Recording operations
      5m 12s
    4. Reviewing and editing an action
      4m 45s
    5. Playing an action (the Button Mode)
      4m 50s
    6. Saving and loading actions
      5m 0s
    7. Copying and modifying an action
      4m 8s
    8. Permitting the user to change settings
      5m 50s
    9. The Best Chrome Effect Ever II
      3m 41s
    10. Recording a fail-safe action
      7m 33s
    11. Rounding corners with a mask
      4m 33s
    12. Cleaning up layers
      3m 51s
    13. Automating layer effects
      7m 1s
    14. Applying chrome with Gradient Map
      6m 24s
    15. Action anomalies
      4m 11s
    16. Rendering effects to layers
      5m 1s
    17. Testing that it works
      2m 0s
  10. 1m 14s
    1. See ya
      1m 14s

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