Home » Adobe Manuals » Computer Software » Adobe 23101335 » Manual Viewer

Adobe 23101335 User Guide - Page 325

Optimizing Images for theWeb, About optimization

UPC - 718659152833

Add to My Manuals
Save this manual to your list of manuals

Page 325 highlights

315 Chapter 12: Optimizing Images for the Web C reating small graphics files is key to distributing images on the World Wide Web. With smaller files, Web servers can store and transmit images more efficiently, and viewers can download images more quickly. Likewise, when preparing images for CD-ROM or other multimedia viewing, it's important to make the image files as small as possible. This conserves file storage space and decreases the amount of RAM needed for image display. About optimization Optimization is the process of fine- tuning the display quality and file size of an image for use on the Web or other online media. Adobe Photoshop and Adobe ImageReady give you an effective range of controls for compressing the file size of an image while optimizing its online display quality. You can optimize images in the three major graphic file formats used on the Web: GIF (Graphics Interchange Format), JPEG (Joint Photographic Experts Group), and PNG-8 or PNG-24 (Portable Network Graphics, with 8-bit or 24-bit color). There are two methods of optimizing images: • For basic optimization, the Photoshop Save As command lets you save an image as a GIF, JPEG, or PNG file. Depending on the file format, you can specify image quality, background transparency or matting, color display, and downloading method. However, any Web features-such as slices, links, animations, and rollovers-that you've added to a file are not preserved. For complete information on using the Save As command to save an image as a GIF, JPEG, or PNG file, see "Saving images" on page 357. • For precise optimization, you can use the optimization features in Photoshop or ImageReady to preview optimized images in different file formats and with different file attributes. You can view multiple versions of an image simultaneously and modify optimization settings as you preview the image to select the best combination of settings for your needs. You can also specify background transparency and matting, select options to control dithering, and resize the image to specified pixel dimensions or a specified percentage of the original size. When you save an optimized file using the Save for Web (Photoshop) or Save Optimized (ImageReady) command, you can choose to generate an HTML file for the image. This file contains all the necessary code to display your image-as well as links, rollovers, and animations-in a Web browser.

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

Match case Limit results 1 per page

315

Chapter 12: Optimizing Images for

the Web

reating small graphics ﬁles is key to

distributing images on the World Wide

Web. With smaller ﬁles, Web servers can

store and transmit images more efﬁciently, and

viewers can download images more quickly.

Likewise, when preparing images for CD-ROM or

other multimedia viewing, it’s important to make

the image ﬁles as small as possible. This conserves

ﬁle storage space and decreases the amount of

RAM needed for image display.

About optimization

Optimization is the process of ﬁne- tuning the

display quality and ﬁle size of an image for use on

the Web or other online media. Adobe Photoshop

and Adobe ImageReady give you an effective range

of controls for compressing the ﬁle size of an

image while optimizing its online display quality.

You can optimize images in the three major

graphic ﬁle formats used on the Web: GIF

(Graphics Interchange Format), JPEG (Joint

Photographic Experts Group), and PNG-8 or

PNG-24 (Portable Network Graphics, with 8-bit

or 24-bit color).

There are two methods of optimizing images:

•

For basic optimization, the Photoshop Save As

command lets you save an image as a GIF, JPEG,

or PNG ﬁle. Depending on the ﬁle format, you can

specify image quality, background transparency or

matting, color display, and downloading method.

However, any Web features—such as slices, links,

animations, and rollovers—that you’ve added to a

ﬁle are not preserved.

For complete information on using the Save As

command to save an image as a GIF, JPEG, or PNG

ﬁle, see “Saving images” on page 357.

•

For precise optimization, you can use the

optimization features in Photoshop or

ImageReady to preview optimized images in

different ﬁle formats and with different ﬁle

attributes. You can view multiple versions of an

image simultaneously and modify optimization

settings as you preview the image to select the best

combination of settings for your needs. You can

also specify background transparency and

matting, select options to control dithering, and

resize the image to speciﬁed pixel dimensions or a

speciﬁed percentage of the original size.

When you save an optimized ﬁle using the Save for

Web (Photoshop) or Save Optimized

(ImageReady) command, you can choose to

generate an HTML ﬁle for the image. This ﬁle

contains all the necessary code to display your

image—as well as links, rollovers, and anima-

tions—in a Web browser.

Adobe 23101335 User Guide - Page 325

Optimizing Images for theWeb, About optimization

Page 325 highlights

Optimizing Images for theWeb, About optimization