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Adobe 23101335 User Guide - Page 105

Changing image size and resolution, Displaying image size information

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ADOBE PHOTOSHOP 6.0 95 User Guide 1-by-1-inch, 100-ppi image and so has four times the file size. Image resolution thus becomes a compromise between image quality (capturing all the data you need) and file size. Another factor that affects file size is file format- due to varying compression methods used by GIF, JPEG, and PNG file formats, file sizes can vary considerably for the same pixel dimensions. Similarly, color bit-depth and the number of layers and channels in an image affect file size. Photoshop supports a maximum file size of 2 GB and maximum pixel dimensions of 30,000 by 30,000 pixels per image. This restriction places limits on the print size and resolution available to an image. Keep in mind that bitmap and vector data can produce different results when you resize an image. Bitmap data is resolution-dependent; therefore, changing the pixel dimensions of a bitmap image can cause a loss in image quality and sharpness. In contrast, vector data is resolutionindependent; you can resize it without losing its crisp edges. Displaying image size information You can display information about the current image size using the information box at the bottom of the application window (Windows) or the document window (Mac OS). (See "Displaying file and image information" on page 78.) Changing image size and resolution Once you have scanned or imported an image, you may want to adjust its size. In Photoshop, the Image Size command lets you adjust the pixel dimensions, print dimensions, and resolution of an image; in ImageReady, you can only adjust the pixel dimensions of an image. For assistance with resizing and resampling images in Photoshop, choose Help > Resize Image. This interactive wizard helps you scale your images for print or online media. To display the current image size: Do one of the following: • (Photoshop) Press Alt (Windows) or Option (Mac OS), position the pointer over the file information box, and hold down the mouse button. The box displays the width and height of the image (both in pixels and in the unit of measurement currently selected for the rulers), the number of channels, and the image resolution. • (ImageReady) Click an image information box, and select Image Dimensions from the pop-up menu. The box displays the width and height of the image in pixels.

Section	Page
Table of Contents	3
Getting Started	11
Registration	11
Installing Adobe Photoshop and ImageReady	11
Learning Adobe Photoshop and ImageReady	11
Using Web resources	13
Other learning resources	14
Customer support	15
Adobe Photoshop Basics	19
Using tools and palettes	20
Opening images in Photoshop and ImageReady	22
Streamlining your workflow	24
Making tonal and color adjustments	26
Retouching images	27
Making pixel selections	28
Making edits	30
Using layers	32
Compositing images	34
Painting	36
Drawing shapes	37
Creating type	40
Editing type	41
Designing Web graphics	42
Creating animations (ImageReady)	43
Optimizing Web graphics	44
What’s New in Adobe Photoshop 6.0	49
Superb vector support	50
Enhanced vector output	52
Layer styles	52
Interactive image warping	54
Enhanced slicing capabilities	55
Enhanced support for image maps and rollovers	57
Weighted optimization	58
Improved Web workflow	58
Streamlined interface	59
Enhanced layer management	60
Expanded text features	61
Preset Manager	63
Other new and enhanced features	63
Looking at the Work Area	67
Using the toolbox	67
Using the tool options bar	69
Using palettes	70
Using context menus	74
Viewing images	74
Correcting mistakes	78
Reverting to any state of an image	79
Duplicating images	83
Using rulers, the measure tool, guides, and the grid	84
Working with Extras	87
Displaying status information	88
Displaying file and image information	88
Annotating images (Photoshop)	90
Jumping between applications	92
Previewing an image in a browser	94
Managing libraries with the Preset Manager (Photoshop)	95
Setting preferences	96
Resetting all warning dialogs	97
Monitoring operations	98
Closing files and quitting	98
Getting Images into Photoshop and ImageReady	101
About bitmap images and vector graphics	101
About image size and resolution	102
Changing image size and resolution	105
Scanning images	109
Creating new images	110
Opening and importing images	111
Placing files	114
Managing files with WebDAV	116
Working with Color	119
About color modes and models (Photoshop)	119
Color gamuts (Photoshop)	124
Adjusting the monitor display	124
Channels and bit depth (Photoshop)	126
Converting between color modes (Photoshop)	127
Converting to indexed color (Photoshop)	128
Applying colors	128
Making color and tonal adjustments	128
Producing Consistent Color (Photoshop)	131
Why colors sometimes don’tmatch	131
About color management	131
Do you need color management?	132
Creating a viewing environment for color management	133
Setting up color management	134
Using predefined color management settings	134
Customizing color management settings	136
Specifying working spaces	137
Specifying color management policies	138
Customizing advanced color management settings	140
Saving and loading color management settings	140
Synchronizing color management between applications	141
Soft-proofing colors	141
Changing the color profile of a document	143
Embedding profiles in saved documents	144
Obtaining, installing, and updating color profiles	144
Creating an ICC monitor profile	146
Selecting	149
About selections	149
Making pixel selections	149
Adjusting pixel selections	156
Softening the edges of a selection	157
Moving, copying, and pasting selections and layers	159
Working with snap	162
Saving and loading selections	163
Deleting selections	163
Removing fringe pixels from a selection (Photoshop)	164
Extracting objects from their background (Photoshop)	164
Drawing and Editing	171
About drawing and painting	171
Drawing shapes and paths	171
Using the shape tools	174
Using the pen tools (Photoshop)	176
Drawing overlapping shapes (Photoshop)	181
Using the Paths palette (Photoshop)	181
Editing paths (Photoshop)	182
Managing paths (Photoshop)	189
Converting between paths and selection borders (Photoshop)	190
Adding color to paths (Photoshop)	192
Transforming and retouching	192
Using Channels and Masks	195
About channels	195
Using the Channels palette (Photoshop)	195
Managing channels (Photoshop)	197
Mixing color channels (Photoshop)	200
Adding spot colors (Photoshop)	201
Using channel calculations to blend layers and channels (Photoshop)	204
About masks (Photoshop)	207
Creating temporary masks in Quick Mask mode (Photoshop)	207
Storing masks in alpha channels	209
Using Layers	215
About layers	215
About layer sets	216
Using the Layers palette	216
Creating a layered image	220
Grouping layers into sets	223
Moving and aligning the contents of layers	224
Editing layers	226
Creating clipping groups	228
Specifying layer properties	229
Using the Layer Style dialog box (Photoshop)	230
Setting layer blending options	231
Using layer styles	236
Customizing layer styles	240
Creating and editing contours (Photoshop)	246
Hiding portions of a layer	247
Using adjustment layers or fill layers (Photoshop)	252
Managing layered images	256
Using Type	261
About type	261
Creating type	261
Working with type layers	264
Formatting characters	268
Formatting paragraphs	275
Controlling hyphenation and justification	277
Working with composition	277
Setting options for Chinese, Japanese, and Korean type (Photoshop)	277
Designing Web Pages	281
About designing Web pages with Photoshop and ImageReady	281
Creating and viewing slices	282
Selecting and modifying slices	286
Specifying slice options	291
Creating and viewing image maps (ImageReady)	296
Selecting and modifying image maps (ImageReady)	298
Specifying image map options (ImageReady)	301
Selecting an image map type (ImageReady)	302
Working with rollovers (ImageReady)	302
Creating Web photo galleries (Photoshop)	307
Creating Animations (ImageReady)	311
About animation	311
Creating animations	311
Working with layers in animations	316
Viewing animations	319
Optimizing animations	319
Viewing animated images in Photoshop	320
Saving animations	320
Opening and importing files as animations	321
Optimizing Images for theWeb	325
About optimization	325
Viewing images during optimization	326
Choosing a file format for optimization	327
Optimizing images	330
Using weighted optimization	337
Optimizing colors in GIF and PNG-8 images	340
Working with hexadecimal values for color	347
Making transparent and matted images	349
Previewing and controlling dithering	351
Setting optimization preferences (ImageReady)	355
Using a droplet to automate optimization settings (ImageReady)	356
Saving optimized images	357
Setting output options	358
Creating background images	362
Saving and Exporting Images	367
Saving images	367
About file formats	374
Adding file information (Photoshop)	376
Adding digital copyright information	376
Setting preferences for saving files (Photoshop)	376
Creating multiple-image layouts (Photoshop)	377
Placing Photoshop images in other applications (Photoshop)	379
Printing (Photoshop)	385
About printing	385
Printing images	386
Positioning and scaling images	387
Setting output options	388
Selecting halftone screen attributes	389
Printing part of an image	392
Choosing a print encoding method	392
Printing vector graphics	392
Using color management when printing	392
Printing with Adobe PressReady	393
Creating color traps	394
Printing duotones	394
Printing color separations	399
Automating Tasks	403
About actions	403
Using the Actions palette	404
Recording actions	404
Playing actions	409
Setting playback options (Photoshop)	410
Editing actions	410
Managing actions in the Actions palette	412
Using the Batch command (Photoshop)	415
Using droplets	416
Using the Automate commands (Photoshop)	420
External automation	421
Index	423

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ADOBE PHOTOSHOP 6.0

User Guide

1-by-1-inch, 100-ppi image and so has four times

the ﬁle size. Image resolution thus becomes a

compromise between image quality (capturing all

the data you need) and ﬁle size.

Another factor that affects ﬁle size is ﬁle format—

due to varying compression methods used by GIF,

JPEG, and PNG ﬁle formats, ﬁle sizes can vary

considerably for the same pixel dimensions.

Similarly, color bit-depth and the number of layers

and channels in an image affect ﬁle size.

Photoshop supports a maximum ﬁle size of 2 GB

and maximum pixel dimensions of 30,000 by

30,000 pixels per image. This restriction places

limits on the print size and resolution available to

an image.

Changing image size and

resolution

Once you have scanned or imported an image,

you may want to adjust its size. In Photoshop,

the Image Size command lets you adjust the pixel

dimensions, print dimensions, and resolution of

an image; in ImageReady, you can only adjust the

pixel dimensions of an image.

For assistance with resizing and resampling

images in Photoshop, choose Help > Resize

Image. This interactive wizard helps you scale your

images for print or online media.

Keep in mind that bitmap and vector data can

produce different results when you resize an

image. Bitmap data is resolution-dependent;

therefore, changing the pixel dimensions of a

bitmap image can cause a loss in image quality and

sharpness. In contrast, vector data is resolution-

independent; you can resize it without losing its

crisp edges.

Displaying image size information

You can display information about the current

image size using the information box at the

bottom of the application window (Windows)

or the document window (Mac OS). (See

“Displaying ﬁle and image information” on

page 78.)

To display the current image size:

Do one of the following:

•

(Photoshop) Press Alt (Windows) or Option

(Mac OS), position the pointer over the ﬁle

information box, and hold down the mouse

button. The box displays the width and height of

the image (both in pixels and in the unit of

measurement currently selected for the rulers),

the number of channels, and the image resolution.

•

(ImageReady) Click an image information box,

and select Image Dimensions from the pop-up

menu. The box displays the width and height of

the image in pixels.