Adobe 5.5 Design Standard Manual de usuario descargar pdf (Pagina 60)

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Adobe Creative Suite 5 Printing Guide 58

down in a page layout, it’s probably not worthwhile to use Photoshop

to scale down the images and update them. But if most of your images

are scaled downor if images are scaled down drasticallyit may be

worthwhile to take the time to reduce their size in Photoshop and

update them in the page layout program. Weigh the time required to

scale the images against the increase in processing timeand increased

storage required for oversized imagesto decide whether it is

necessary to create downsized images.

Resampling images

When image scaling becomes necessary, Photoshop offers some

refinements to optimize the results. Choose Image > Image Size to see

the Image Size dialog box. You can resize an image by pixel dimensions

or document size. Under both the pixel count and document size

options, you can also specify a percentage size. If Resample Image is

not selected, the Pixel Dimensions part of the dialog box is dimmed,

because the pixel count won’t change if the image is not resampled.

Keep in mind that in-RIP image interpolation is comparable to that in

Photoshop. And image content will ultimately be resampled as part of

the RIP process. Consequently, attempting to get a “head start” by

resampling or scaling in Photoshop actually adds an unnecessary

interpolation step. The only exception is for images that require

substantial sharpening, which should be performed at or near the final

target resolution. Note that upsampling an image does not improve it.

This is especially true of screen shots, which should be left at their

original resolution throughout the workflow if possible.

Pixel Count/

Percentage

(toggle)

Document Dimensions

Scaling Options

Image Size

Choose options according to how you intend to resize an image—by dimensions or by pixel

count. (Scaling a placed image in InDesign or Illustrator does not let you interpolate image

data. )

If the Resample Image option is selected, Photoshop must interpolate

information. That is, it must manufacture image data to “fill in the

blanks” if the image is scaled up. If the image is scaled down with

Resample Image selected, interpolation governs what information is

discarded. The scaling options include six methods for resampling, and

even offers parenthetical hints about suitable uses for the methods:

•Nearest Neighbor (Preserve Hard Edges): Appropriate when resizing

screen shots (to avoid anti-aliasing small text), but inappropriate for

photographic images.

•Bilinear: Averages the color of surrounding pixels; fast, but produces

medium-quality results.

•Bicubic (Best For Smooth Gradients): Slower, but produces smoother

results than Bilinear.

•Bicubic Smoother (Best for Enlargement): As the hint implies,

smooths the results to minimize obvious pixels or jagged artifacts.

•Bicubic Sharper (Best for Reduction): Accentuates edge sharpening

to camouage the loss of data when scaling down images.

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Adobe 5.5 Design Standard Manual de usuario Pagina 60

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