Adobe 5.5 Design Standard Manual de usuario descargar pdf (Pagina 61)

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Adobe Creative Suite 5 Printing Guide 59

Note: To specify a default scaling method, choose Edit > Preferences > General (Win-

dows) 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.

Resizing Without Resampling

Digital camera shots oen open in Photoshop with low resolution but oversized dimensions.

Turn o the Resample Image option and set the resolution or dimensions. e dimensions

and resolution are interrelated, so the le size of the image does not change because no

pixels are lost (or manufactured).

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 5 products fully support a

color-managed workflow, and Adobe Bridge can synchronize color

settings across all the programs in Creative Suite 5 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 (bilevel).

Color Gamuts

A comparison of AdobeRGB (red line),

ProPhotoRGB (blue line) and CMYK (doed line)

gamuts to the range of visible light (color shape).

RGB

The native color mode of images from scanners and digital cameras is

RGB (red-green-blue). As humans, we also “think” in RGB, because the

color receptors in our eyes process red, green, and blue light to create

our view of the world. The gamut of RGB light is somewhat larger than

the range of colors that can be printed with CMYK process inks, which is

why some vibrant colors in RGB images displayed on a monitor lose

richness when printed. This may require some explanation to customers

who are disappointed when comparing a printed piece to what they see

on their monitor.

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Adobe 5.5 Design Standard Manual de usuario Pagina 61

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