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Calculating the actual print size

From: Photoshop CS3 Sharpening Images

Video: Calculating the actual print size

So now that we know about the reliable zoom ratios and we know what the resolution of our screen is, what do we do with that information? Well, I am going to show you how to use that information in order to gauge the sharpness of an image and proper sharpening settings to apply, the best Amount and Radius values for example. And we will see that inside of this image, Stunning 12x8.JPG found inside the 01HowitWorks folder. You may recall that, this is that wonderful image from photographer Alexander Alexis that already looks sharp enough; we just want to make sure that it weathers the storm for commercial output and that it looks nice and sharp on the page.

Calculating the actual print size

So now that we know about the reliable zoom ratios and we know what the resolution of our screen is, what do we do with that information? Well, I am going to show you how to use that information in order to gauge the sharpness of an image and proper sharpening settings to apply, the best Amount and Radius values for example. And we will see that inside of this image, Stunning 12x8.JPG found inside the 01HowitWorks folder. You may recall that, this is that wonderful image from photographer Alexander Alexis that already looks sharp enough; we just want to make sure that it weathers the storm for commercial output and that it looks nice and sharp on the page.

So what I am going to do first, I am going to investigate what my print resolution is. I am going to go up to the Image menu and I am going to choose the Image Size Command or I can press Ctrl+Alt+I or Command+ Option+I on the Mac and we can see that if set this image to print at 12" wide x 8" tall and I have enough pixels in order for the resolution to be 267 pixels per inch, which is one of the standard print resolutions. There are no magic numbers where print resolutions are concerned, but 267 is based on twice 133 LPI Halftone Screen, that's where this comes from.

It is not really necessary that you know that. It is just that 267 and 300 and 360 are some common print resolutions out there, but you can print at anything from about 220 PPI up and get some very sharp imagery out of most printers. So meanwhile let's say I am working on a 17 inch MacBook Pro. It is fairly hilarious that I am doing that given that I am running Windows Vista, but still it is a minor problem. I am working on a 17" MacBook Pro and it has a resolution of a 117 pixels/inch. So what we would do is, we will whip on our calculators right, you must have one sitting around some place, and you would divide 267, so take the number 267, and divide it by 117 and you will get the number 2.28. That is going to be our multiplier.

So 2.28. Just scribble that down, if you have already figured out what the resolutions of your screen is, it may be something entirely different. Why then, divide 267 by it. so maybe your screen resolution is 102 pixels/inch, you divide 167 by 102, do the math, write down the multiplier number on a sheet of paper. Then go ahead and cancel out. We do not want to change the resolution of this image, this is what we want to do instead. Go up to the Image menu and choose Duplicate, and I want you to call this Actual print size because this guy is really going to represent the printed size of the image.

Go ahead and click on the OK button, then I want you to go up to the Image Size command, so this is a separate version of the image, go up to the Image Size command here and I want you to make sure that Resample Image is turned on. Make sure that Bicubic is selected (best for smooth gradients), make sure that Constraint Proportions is turned on. Scale Styles doesn't matter, but you might as well turn on all of your check boxes. Then I want you to change the Resolution value, in my case to 117. Now you might change it to something else, like I said if your screen resolution is 102, change it to that.

So go ahead and change the Resolution value to the resolution of your monitor and then click OK. And then I want you to zoom the image into the 100% zoom ratio. So press Ctrl + plus, or Command + plus on the Mac, until you see a 100% up here inside of the title bar. This is the size at which your image will actually print. Now let us go back to the other image, the Stunning 12x8.JPG file. Go ahead and select it, and I want you to go to the View menu and I want you to choose this command right there, Print Size, and it will zoom the image out to what Photoshop thinks is the size at which the image is really going to print. But notice how these two images here, they fairly differ from each other.

Your actual print size, which is the real deal my friends, is different from Photoshop's version because Photoshop, in this case, is wrong. Why is Photoshop wrong? Because Photoshop is assuming the resolution of your screen is 72 pixels/inch. Now you could set Photoshop straight, by going to the Units and Rulers section of the Preferences dialog box and changing the Screen Resolution value. I could change that to 117 pixels/inch and then Photoshop would get the size right. The problem is that's not going to be a good zoom ratio for you.

So it's going to be of no use where sharpening is concerned. The upshot is where gauging sharpening is concerned, this Print Size command here is of no use to you whatsoever. Having interpolated the image, we now have an accurate picture of the image. I want you to go back to it, the actual print size version, and we're going to use this version of the image to gauge the best Amount and Radius values, and we're going to use those values to sharpen the big version of the image, the Stunning 12x8.jpg file, and we're going to do that in the very next exercise.

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This video is part of

Image for Photoshop CS3 Sharpening Images
Photoshop CS3 Sharpening Images

115 video lessons · 17037 viewers

Deke McClelland
Author

 
Expand all | Collapse all
  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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