Adobe Photoshop CC For Dummies. Peter Bauer. Читать онлайн. Newlib. NEWLIB.NET

Автор: Peter Bauer
Издательство: John Wiley & Sons Limited
Серия:
Жанр произведения: Программы
Год издания: 0
isbn: 9781119711780
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the cursor within the window and you can drag to reposition the preview and change the zoom factor. And rather than dragging and dragging and dragging in the small window to move the preview to a distant part of the image, simply click that area in the image itself to jump the preview to that location. The Reduce Noise slider can be used to minimize the amount of little speckles that sometimes appear when resampling an image.

Snapshot of the Image Size dialog box that includes a preview window and an automated Fit To option.

      FIGURE 2-5: The Image Size dialog box includes a preview window and an automated Fit To option.

      

You’ll find it very handy to change the pixel dimensions and the print size at the same time in the Image Size dialog box. And, much to the delight of math-challenged folks, the Image Size feature does most of the calculations for you. For example, with the Link option selected (note the tiny Link icon to the left of the Width and Height boxes), you enter a new Width, and Photoshop calculates the new Height automatically! To disable this option so that you can change only the width or the height (which is rare), just click the Link icon.

      Changing the size of your artwork with the Image Size command

Snapshot of zooming an image to 300-percent.

      FIGURE 2-6: As the smaller image shows at 300% zoom, you can reduce an image too much.

Snapshot of a slider just below in the Image Size dialog box to control noise in the enlargement.

      FIGURE 2-7: When either Preserve Details option is selected, you’ll also see a slider just below it in the Image Size dialog box to control noise in the enlargement.

Snapshot of scaling an image without scaling its layer styles.

      FIGURE 2-8: Scaling an image without scaling its layer styles can ruin your image.

      The Resample option is the one that might require the attention of that gray matter within your skull. Not only do you need to decide whether you want to resample the image (change its pixel dimensions), but you also need to decide how you want to resample. Refer to Figure 2-7 to see that you have eight different ways to calculate the change (called resampling algorithms).

      When using Image Size without resampling, you’re simply changing the instructions recorded in the image for your printing device. When you enter one dimension, either width or height, Photoshop does the math and fills in both the other dimension and the new resolution.

Snapshot of resizing an image without constraining proportions.

      FIGURE 2-9: Resizing an image without constraining proportions. Interesting, yes, but useful?

Snapshot of clearing the Resample Image check box to change print size, not pixel dimensions.

      FIGURE 2-10: Clear the Resample Image check box to change print size, not pixel dimensions.

Take a look at Figure 2-11. I selected the Resample Image check box and entered 10 and inches for my new print width to print this image to a letter-size (8.5 x 11 inches) sheet of paper. Photoshop fills in the new height (6.667 inches). But what if I want an 8-x-10 print? If I enter 8 and inches for the height, Photoshop recalculates the width to 12 inches. If I want a true 8-x-10, I have to crop some of the image because most digital photos have a different aspect ratio than an 8-x-10. (You can read more about cropping to a specific aspect ratio in Chapter 4.)

Snapshot of entering a value, and Photoshop that recalculates the fields automatically.

      When you resample an image (change the pixel dimensions), Photoshop takes the image and maps it to the new size, attempting to preserve the image’s appearances as much as possible at the new size, using the new number of pixels. Of course, if you take an image that’s more than 3,000 pixels wide and resample it to 300 pixels wide, you’re going to lose some of the detail. And, conversely, resampling an image from 300 pixels wide to 3,000 pixels wide, even when using the Preserve Details resampling algorithm, is likely to introduce some softness to the image’s appearance.

      TO RESAMPLE OR TO CROP: THAT IS THE QUESTION

      To