Adobe 65023809 Printing Guide - Page 60

Color mode, Bilinear, Bicubic Best For Smooth Gradients, Bicubic Smoother Best for Enlargement

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• Bilinear: Averages the color of surrounding pixels; fast, but produces mediumquality 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 camouflage the loss of data when scaling down images. Note: To specify a default scaling method, choose Edit > Preferences > General (Windows) or Photoshop > Preferences > General (Mac OS), and then choose a method from the Image Interpolation Methods menu. Changing resolution without resampling During interpolation, pixels are created or averaged from existing information in the image. But if you resize an image without resampling, no information is created or lost. The most common example of this approach involves digital camera images, which are frequently very large, but with low resolution. The solution for this sort of image is to change the resolution without altering pixels. Choose Image > Image Size, and deselect the Resample Image option. You'll then see that dimensions and resolution are linked together: increase the resolution and the dimensions are reduced. Decrease the dimensions and the resolution is increased. Set the resolution to an appropriate value, such as 300 ppi, and the width and height fall into place accordingly. With this approach, no pixels are lost or created, so the file size is not changed. In essence, only the number of pixels per inch (or centimeter) is changed, not the actual pixels themselves. Color mode If you are using a color-managed workflow, you may be accustomed to receiving RGB or Lab images from your customers, tagged with the correct color profiles. All Creative Suite 4 products fully support a color-managed workflow, and Adobe Bridge can synchronize color settings across all the programs in Creative Suite 4 for consistency. (For more on color management, see the "Common Resources" chapter in this document.) If you are not using color management, you probably expect your customers to supply CMYK or grayscale images in submitted jobs. There are also other color modes to consider, such as grayscale, multitone, and bitmap. Resizing Without Resampling Digital camera shots often open in Photoshop with low resolution but oversized dimensions. Turn off the Resample Image option and set the resolution or dimensions. The dimensions and resolution are interrelated, so the file size of the image does not change because no pixels are lost (or manufactured). Adobe Creative Suite 4 Printing Guide 58

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Adobe Creative Suite 4 Printing Guide
58
•
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 camouflage
the loss of data when scaling down images.
Note:
To specify a default scaling method, choose Edit > Preferences > General (Windows) or Pho-
toshop > Preferences > General (Mac OS), and then choose a method from the Image Interpolation
Methods menu.
Changing resolution without resampling
During interpolation, pixels are created or averaged from existing information in the image. But
if you resize an image without resampling, no information is created or lost. °e most common
example of this approach involves digital camera images, which are frequently very large, but
with low resolution. °e solution for this sort of image is to change the resolution without alter-
ing pixels.
Choose Image > Image Size, and deselect the Resample Image option. You’ll then see that dimen-
sions and resolution are linked together: increase the resolution and the dimensions are reduced.
Decrease the dimensions and the resolution is increased. Set the resolution to an appropriate
value, such as 300 ppi, and the width and height fall into place accordingly. With this approach,
no pixels are lost or created, so the file size is not changed. In essence, only the number of pixels
per inch (or centimeter) is changed, not the actual pixels themselves.
Color mode
If you are using a color-managed workflow, you may be accustomed to receiving RGB or Lab
images from your customers, tagged with the correct color profiles. All Creative Suite 4 products
fully support a color-managed workflow, and Adobe Bridge can synchronize color settings across
all the programs in Creative Suite 4 for consistency. (For more on color management, see the
“Common Resources” chapter in this document.)
If you are not using color management, you probably expect your customers to supply CMYK or
grayscale images in submitted jobs. °ere are also other color modes to consider, such as gray-
scale, multitone, and bitmap.
Resizing Without Resampling
Digital camera shots often open in Photoshop with
low resolution but oversized dimensions° Turn off
the Resample Image option and set the resolution
or dimensions° The dimensions and resolution are
interrelated, so the file size of the image does not
change because no pixels are lost (or manufactured)°