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Photoshop CS3 Sharpening Images
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Using reliable zoom ratios


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Photoshop CS3 Sharpening Images

with Deke McClelland

Video: Using reliable zoom ratios

Now based on the previous exercise, those of you who watched it, you might figure that given that your screen resolution is somewhere in the neighborhood of one quarter to one half of the output resolution, the resolution at which you're going to print an image, then you could just zoom out in order to gauge how your halos are going to look, in order to gauge the sharpness of the image. And that's true to an extent. But you have to be careful when zooming an image, and I am going to give you a sense of why you have to be careful with the help of this whacky image right here.
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  1. 50m 30s
    1. Why every image needs sharpening
      2m 38s
    2. Understanding the effects of sharpening
      5m 26s
    3. Understanding the mechanics of sharpening
      4m 19s
    4. Understanding sharpening and gradual transitions
      3m 21s
    5. Understanding sharpening and noise reduction
      4m 0s
    6. Understanding amount and radius
      7m 50s
    7. Measuring your screen resolution
      6m 19s
    8. Using reliable zoom ratios
      5m 30s
    9. Calculating the actual print size
      4m 54s
    10. Gauging the ideal sharpening settings
      6m 13s
  2. 59m 31s
    1. Everyone knows you sharpen last (and everyone is wrong)
      1m 8s
    2. Understanding the conventional sharpening workflow
      5m 4s
    3. Flattening and saving to TIFF
      6m 39s
    4. Downsampling (and why you shouldn't upsample)
      6m 8s
    5. Understanding last-step sharpening
      6m 44s
    6. Recognizing problems with the conventional workflow
      9m 38s
    7. Erasing sharpening with the history brush
      4m 30s
    8. Using alternative sharpening workflows
      2m 37s
    9. Sharpening a scanned photograph shot on film
      2m 45s
    10. Sharpening a digital photograph
      3m 6s
    11. Sharpening specific details
      3m 43s
    12. Finding broad workflow conclusions
      2m 49s
    13. Learning that technique trumps timing
      4m 40s
  3. 1h 27m
    1. Comparing and contrasting neighboring pixels
      1m 6s
    2. Using the Gaussian Blur filter
      4m 25s
    3. Using Gaussian luminance distribution
      4m 47s
    4. Using the Unsharp Mask filter
      4m 54s
    5. Understanding the history of Unsharp Mask
      3m 51s
    6. Building your own USM with Gaussian Blur
      7m 35s
    7. Using the Smart Sharpen filter
      7m 35s
    8. Compensating for camera shake
      8m 50s
    9. Building your own Smart Sharpen with Lens Blur
      6m 59s
    10. Using directional sharpening with Emboss
      9m 13s
    11. Using Smart Sharpen extras
      8m 56s
    12. Using Convolution Kernels for more accuracy
      7m 8s
    13. Using the High Pass filter
      7m 32s
    14. Using Luminance Sharpening
      5m 5s
  4. 2h 14m
    1. Smoothing filters, smart objects, and masks
      1m 25s
    2. Using the Median filter and Dust and Scratches
      7m 7s
    3. Using Smart Blur and Surface Blur
      6m 12s
    4. Using the Despeckle filter
      8m 17s
    5. Softening flesh tones selectively
      10m 15s
    6. Using the Reduce Noise filter
      7m 27s
    7. Combining smoothing and sharpening
      8m 24s
    8. Making an image into a smart object
      9m 24s
    9. Applying editable smart filters
      6m 8s
    10. Combining two smart filters
      8m 5s
    11. Assigning a filter mask
      5m 59s
    12. Nesting one smart object inside another
      10m 32s
    13. Employing a static High Pass layer
      8m 59s
    14. Matching static pixel-level edits
      4m 37s
    15. Avoiding clipping with luminance blending
      9m 7s
    16. Sharpening and smoothing
      6m 36s
    17. Making an edge mask
      8m 14s
    18. Making a non-edge mask
      7m 17s
  5. 1h 33m
    1. Sharpening with Adobe Camera Raw
      1m 29s
    2. Introducing Camera Raw (4.1 or later)
      8m 13s
    3. Understanding why to sharpen for source
      5m 14s
    4. Using Camera Raw’s sharpening control
      5m 52s
    5. Previewing limitations and tricks
      6m 45s
    6. Why downsampling doesn’t work
      3m 12s
    7. Reducing chromatic aberration
      7m 30s
    8. Using the Defringe option
      3m 32s
    9. Understanding high frequency, low radius
      5m 21s
    10. Raising the Detail value
      3m 6s
    11. Using on-the-fly edge masking
      5m 41s
    12. Sharpening a low-frequency portrait
      6m 36s
    13. Eliminating color noise
      4m 47s
    14. Reducing luminance noise
      4m 42s
    15. Correcting “false sharpening”
      7m 15s
    16. Reducing shadow noise
      5m 22s
    17. Approximating ACR sharpening in Photoshop
      8m 35s
  6. 59m 8s
    1. Gauging and exploiting luminance frequency
      1m 27s
    2. Using low-frequency source sharpening
      5m 53s
    3. Using High Pass for portraits
      4m 19s
    4. Actioning a low-frequency edge mask
      7m 42s
    5. Modifying the source sharpening
      5m 21s
    6. Using high-frequency source sharpening
      5m 26s
    7. Using Smart Sharpen for cityscapes
      3m 2s
    8. Actioning a high-frequency edge mask
      5m 4s
    9. Downplaying color artifacts and clipping
      4m 4s
    10. Sharpening a medium-frequency image
      5m 24s
    11. Sharpening a layered composition
      7m 16s
    12. Sharpening for multiple frequencies
      4m 10s
  7. 1h 8m
    1. Who needs dull when you have sharp?
      56s
    2. Focusing in on a person’s eyes
      4m 22s
    3. Blurring the area outside the eyes
      4m 22s
    4. Sharpening eyes and other details
      5m 38s
    5. Darkening the lashes and eyebrows
      7m 13s
    6. Sharpening dark-haired people
      5m 2s
    7. Edge mask and emphasize
      3m 39s
    8. Nesting a Smart Sharpen effect
      4m 48s
    9. Density mask sharpening
      5m 35s
    10. Adding depth of field
      4m 39s
    11. Sharpening a background
      4m 23s
    12. Masking background from foreground
      8m 51s
    13. Eliminating halos around a person
      5m 38s
    14. Deepening and warming a background
      3m 28s
  8. 1h 18m
    1. Reverting back to convention
      1m 37s
    2. Understanding the use-neutral composition
      4m 15s
    3. Restoring much-needed antialiasing
      4m 2s
    4. Reducing noise in a high-frequency image
      7m 24s
    5. Making a third-level smart object
      3m 55s
    6. Preparing an image for print
      5m 18s
    7. Using ideal settings for commercial reproduction
      5m 37s
    8. Calculating very large-format settings
      5m 11s
    9. Using ideal settings for inkjet output
      4m 26s
    10. Sharpening for commercial reproduction
      5m 45s
    11. Sharpening for inkjet output
      4m 58s
    12. Revealing high-frequency multipass sharpening
      5m 21s
    13. Using Gaussian Blur to sharpen hair
      5m 41s
    14. Flatten, Save As, Resample, and Sharpen
      5m 9s
    15. Revealing low-frequency multipass sharpening
      3m 30s
    16. Sharpening an image for web or screen
      6m 22s
  9. 1m 50s
    1. Goodbye
      1m 50s

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Photoshop CS3 Sharpening Images
10h 33m Intermediate Feb 15, 2008

Viewers: in countries Watching now:

Real focus happens inside the camera's lens element. The sharpening features in Photoshop CS3 exaggerate the contrast along edges in a photograph to transform a well-focused image into an outstanding image. In Photoshop CS3 Sharpening Images, Deke McClelland teaches a host of sharpening and noise reduction techniques, including using filters such as Unsharp Mask, Smart Sharpen, High Pass, and Reduce Noise. The training teaches the essentials of sharpening, including what it does, why it's important, and how the filters function. Plus, the training covers Deke's recommended best practices, including the four distinct varieties of sharpening, which can be used independently or in combination with each other. Photoshop CS3 Sharpening Images is about how to transform images from looking good to looking their absolute best. Exercise files accompany the course.

Topics include:
  • Understanding the effects of sharpening
  • In-depth examinations of Unsharp Mask, Smart Sharpen, Emboss, and High Pass
  • Smoothing an image with the Surface Blur, Despeckle, and Reduce Noise features
  • Working with smart objects and smart filters
  • Creating edge masks and non-edge masks
  • Sharpening for digital-image capture using Camera Raw
  • Gauging and exploiting luminance frequency
  • Exploring creative applications of sharpening
  • Sharpening a multilayer composition
  • Sharpening eyes, hair, and out-of-focus backgrounds
  • Reducing noise in a high-frequency image
  • Determining ideal settings for commercial and inkjet output
  • Sharpening very large-format images
  • Sharpening an image for the web or screen output
Subjects:
Photography Sharpening
Software:
Photoshop
Author:
Deke McClelland

Using reliable zoom ratios

Now based on the previous exercise, those of you who watched it, you might figure that given that your screen resolution is somewhere in the neighborhood of one quarter to one half of the output resolution, the resolution at which you're going to print an image, then you could just zoom out in order to gauge how your halos are going to look, in order to gauge the sharpness of the image. And that's true to an extent. But you have to be careful when zooming an image, and I am going to give you a sense of why you have to be careful with the help of this whacky image right here.

I know it's a little bit unpleasant to look at and I wouldnt stare it your image because its going to burn your retina, but what we have is a series of parallel lines, hence the name of the image, it's Parallel lines.PSD. It's found inside the 01 How It Works folder, and its a series of parallel lines that are formed by a combination of four pixel wide black lines followed by two pixel wide white lines, and they're alternating of course. Now currently I am looking at the image at the 400% zoom ratio. What were going to do though is were going to go ahead and crop the movie so that we can see these lines nice and tight.

Alright. Now I'll just narrate where we are in terms of zoom ratios. Now anything above a 100% is perfectly fine. Its not going to throw you off, as long as its in the even multiple of 100%. So 100%, 200%, 300%, etc. are going to work just fine for you. You're going to have an accurate view of the image, albeit you'll have a really big mass of pixels. Its when you start going below 100% the things get problematic. So here we are at 300%, the lines are still very uniform as you can see. Here is 200%.

Everything looks hunky-dory at this point right here. I am going to go ahead and scroll the image over a little bit, but the pixels look just fine, the lines look fine, that is to say. Heres the 100% view, things are still holding up very nicely, meaning that the widths of all the black lines is uniform and the width of all the white lines is uniform. OK. Now I am going to press, I am pressing by the way, Control + minus or Command + minus on the Macintosh side in order to zoom out. If I press Command + minus again, or Control + minus here on the PC, here is the 66.7% zoom ratio.

It's a terrible zoom ratio, and the reason is because it drops pixels. Photoshop just goes ahead and abandons pixels as it's rendering the screen. So instead of trying to resolve the entire image to this new zoom ratio, it just goes ahead and drops out pixels that it can't use. As a result, in the case of this particular image, we have a gigantic distortion midway through the image over here on the right hand side of the image. It suddenly looks totally wrong. We just have this weird disconnect between the right side and left side here.

that's not really part of the image, but it's showing up. The way it's going to resolve itself when you're looking at a continuous tone photograph, as you're going to see sharp, sometimes jagged transitions where sharp jagged transitions do not exist. So if anything the image is going to look sharper than it actually at 66.7%. Alright. If I press Control + minus or Command + minus again to zoom out to the 50% zoom ratio, everything is one again hunky-dory, and the reason is that Photoshop is now performing an interpolation, what's knows as the bicubic interpolation, meaning that its averaging the pixels in the real image in order to create this 50% view.

Now 66.7 isnt the only bad one, everything between 50% and 100% is bad. So everything from 50.1% to 99.9% has problems and you should not believe it. So you can believe 100%, you can believe 50%, you can't believe anything in between. Now lets press Control + minus or Command + minus. Again, this is 33%. Can you believe it? I don't think so. Something has gone terribly wrong with the right half of the image, it's turned solid black.

Meanwhile, Photoshop is doing a decent job over here on the left hand side of the image. Again, were going to see jag a transitions and sharp edges where none exist inside the actual photograph. Now zoom out another stop here, another increment to 25%, its another good bicubic interpolation view of the image. You cant trust anything between 25% and 50%, though you can trust those two. So we got 100, that's good, we got 50 that's good, we got 25, that's good and anything in between those guys, is bad.

Heres the next zoom out. This is 16.7%, also bad, and then zoom out again to 12.5%, that's good, and then we start getting so small that is not very helpful. So every other, if you're pressing Control + minus to zoom out or Command + minus on the Mac to zoom out or Control + plus or Command + plus to zoom in, then every other increment is good. So starting at 12.5%, I'll press Control + plus or Command + plus to zoom in, we've got bad, we've got good, we've got bad, we've good, we've got bad, as witnessed over here on the right hand side of the image, we have good at 100%.

So just something to bear in mind, some of the zoom ratios, 12.5%, 25%, 50%, and 100%, are good, and then even multiples of 100%, 200%, 300%, and 400%, those are good as well. But anything in between 12.5, 25, 50, and 100, consider those absolutely 100% unreliable where gauging, sharpening in Photoshop is concerned.

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