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PHOTOSHOP CS3
User Guide
61
Image size and resolution
About pixel dimensions and resolution
The pixel dimensions (image size or height and width) of a bitmap image is a measure of the number of pixels along
an image’s width and height. Resolution is the fineness of detail in a bitmap image and is measured in pixels per inch
(ppi). The more pixels per inch, the greater the resolution. Generally, an image with a higher resolution produces a
better printed image quality.
Same image at 72-ppi and 300-ppi; inset zoom 200%
The combination of pixel dimension and resolution determine the amount of image data. Unless an image is
resampled,theamountofimagedataremainsthesameasyouchangeeitherthepixeldimensionorresolution.Ifyou
change the resolution of a file, its width and height change accordingly to maintain the same amount of image data.
And, vice versa. For more information, see “Resampling” on page 64.
In Photoshop, you can see the relationship between image size and resolution in the Image Size dialog box (choose
Image > Image Size). Deselect Resample Image, because you don’t want to change the amount of image data in your
photo. Then change the width or the height or the resolution. As you change one value, the other two values change
accordingly.
- PHOTOSHOP 1
- Copyright 2
- Contents 3
- Chapter 1: Getting started 8
- Adobe Help 9
- Using Help in the product 10
- Accessibility features 11
- Resources 12
- Photoshop CS3 videos 13
- Installed resources 14
- Bridge Home 15
- Adobe Design Center 16
- Adobe Developer Center 17
- Customer support 17
- Downloads 17
- What’s new? 18
- Image editing improvements 19
- Compositing enhancements 19
- 3D and motion advances 20
- Comprehensive image analysis 20
- Chapter 2: Workspace 21
- Hide or show all panels 22
- Display panel menu options 22
- Customize the workspace 23
- Move panels 24
- Manipulate panel groups 24
- Stack free-floating panels 25
- Resize or minimize panels 25
- Minimize button 26
- Panels collapsed to icons 26
- Panels expanded from icons 26
- ❖ In Interface preferences: 27
- Palettes and menus 28
- Display context menus 31
- Define a set of menus 31
- Delete a set of menus 32
- Turn menu colors on or off 32
- About tools 32
- Selection tools gallery 34
- Crop and slice tools gallery 34
- Retouching tools gallery 34
- Painting tools gallery 35
- Use a tool 37
- Cycle through hidden tools 37
- Change tool pointers 37
- Using the options bar 38
- Create and use tool presets 38
- Viewing images 40
- Use the Navigator palette 41
- Zoom in or out 41
- Match locations in images 43
- Work with the Info palette 44
- 7 Click OK 46
- Rulers, the grid, and guides 48
- Use snapping 52
- Show or hide Extras 52
- Work with the Preset Manager 53
- Manage preset items 54
- Preferences 55
- Open a preferences dialog box 56
- Plug-ins 57
- Recovery and undo 58
- Work with the History palette 59
- Set Edit History Log options 61
- Memory and performance 63
- Free memory 64
- Photoshop images 65
- Image size and resolution 68
- File size 69
- Resampling 71
- View the print size on-screen 74
- Create a new image 76
- Placing files 81
- High dynamic range images 84
- Merge images to HDR 86
- 4 Do any of the following: 89
- Chapter 4: Camera Raw 92
- 3. Adjust color 94
- Camera Raw Settings menu 96
- Camera Raw view controls 96
- Image adjustment tabs 97
- 2 Do any of the following: 97
- 4 Click Save 100
- Format options 100
- PHOTOSHOP CS3 101
- Correcting the white balance 102
- Adjust tone in Camera Raw 103
- Rotate images with Camera Raw 107
- Retouch images in Camera Raw 108
- Remove red-eye in Camera Raw 108
- Reducing noise in Camera Raw 109
- Camera Raw settings 110
- Applying a preset 112
- Camera Raw Workflow options 113
- Chapter 5: Color 114
- See also 115
- Color modes 117
- Multichannel mode 119
- Pattern Dither 121
- Choosing colors 125
- Chapter 6: Color management 135
- Keeping colors consistent 137
- Set up color management 139
- Proofing colors 144
- Soft-proof colors (Acrobat) 145
- Working with color profiles 148
- Color settings 153
- Color conversion options 156
- About rendering intents 156
- About histograms 158
- Histogram palette overview 158
- Histogram palette 159
- View histogram statistics 160
- 2 Do one of the following: 160
- Preview histogram adjustments 161
- Refresh the histogram display 161
- View color values in an image 162
- Adjusting color samplers 163
- Correcting images 164
- Color adjustment commands 165
- Make a color adjustment 165
- Identify out-of-gamut colors 166
- Levels overview 167
- 1 Do one of the following: 168
- Adjust color using Levels 169
- Curves overview 170
- Set Curve display options 171
- Apply an Auto correction 173
- Set black and white points 173
- Adjust hue and saturation 175
- E. Moves entire slider 176
- Add contrast to a photo 179
- Targeting images for press 181
- Apply the Auto Levels command 190
- Apply the Variations command 193
- To use the Equalize command 194
- Desaturate colors 194
- Invert colors 195
- Posterize an image 195
- Crop and Straighten photos 200
- Make a photo frame 202
- Patched image 208
- About lens distortion 212
- Set camera and lens defaults 213
- Sharpen images 214
- Sharpen using Smart Sharpen 215
- Sharpen using Unsharp Mask 216
- Sharpen selectively 217
- Add lens blur 219
- Transforming objects 220
- Repeat a transformation 223
- Transform freely 223
- Warp an item 224
- 4 Do one of the following: 225
- Liquify filter 226
- Distortion tools 227
- Reconstruct distortions 229
- Work with meshes 231
- Work with backdrops 231
- Vanishing Point 232
- Vanishing Point tools 233
- Work in Vanishing Point 234
- • Move the Angle slider 237
- ❖ Do any of the following: 238
- Create panoramic images 246
- 4 Choose a Layout option 247
- Adding Cylindrical Mapping 248
- Navigate in the dialog box 249
- Zoom in the dialog box 249
- Rotate images 249
- Chapter 9: Selecting 251
- Select with the marquee tools 252
- Select with the Lasso tool 253
- User Guide 254
- Select a color range 257
- Sampling color 258
- Adjusting pixel selections 259
- Adjust selections manually 260
- Intersected selections 261
- Refine selection edges 262
- 3 Click OK 264
- Copy between applications 267
- Channels 271
- Show or hide a channel 273
- Show color channels in color 273
- Select and edit channels 273
- Merge channels 275
- Delete a channel 276
- Change Quick Mask options 278
- Channel calculations 282
- Subtract 284
- Chapter 10: Layers 285
- Layers palette overview 286
- Convert background and layers 287
- Create layers and groups 287
- Duplicate layers 288
- Select layers 290
- Group and ungroup layers 291
- Add layers to a group 291
- Link and unlink layers 291
- Show layer edges and handles 292
- Move the content of layers 292
- Managing layers 296
- Rasterize layers 297
- Delete a layer or group 297
- Export layers 298
- Track file size 298
- Merge and stamp layers 298
- Setting opacity and blending 299
- Create a knockout 301
- Group blend effects 302
- 4 Click OK 303
- Layer effects and styles 304
- Apply preset styles 305
- Layer style options 307
- Display or hide layer styles 309
- ❖ Do one of the following: 310
- Copy layer styles 311
- Scale a layer effect 312
- Remove layer effects 312
- Adjustment and fill layers 313
- Create an adjustment layer 314
- Create a fill layer 314
- Nondestructive editing 315
- Create Smart Objects 317
- About Smart Filters 319
- Apply a Smart Filter 319
- Layer comps 322
- Create a layer comp 323
- Apply and view layer comps 323
- Clear layer comp warnings 324
- Delete a layer comp 324
- Export layer comps 324
- Masking layers 325
- Add and edit vector masks 328
- Unlinking layers and masks 328
- Chapter 11: Painting 332
- Paint tool options 333
- Paint with a pattern 333
- Erase with the Eraser tool 335
- Brush presets 337
- Create a new preset brush 339
- Brushes palette overview 339
- Blending modes 350
- List of blending modes 351
- Blending mode examples 353
- Gradients 354
- Gradient Editor overview 356
- Create a smooth gradient 356
- Create a noise gradient 358
- Fill the work canvas 360
- Chapter 12: Drawing 365
- Drawing shapes 366
- Drawing with the Pen tools 370
- Draw curves with the Pen tool 371
- Finish drawing a path 373
- Managing paths 376
- Manage paths 377
- Editing paths 378
- Adjust path segments 380
- Add or delete anchor points 384
- Adding color to paths 387
- Stroke paths with color 388
- Chapter 13: Filters 390
- Display the Filter Gallery 392
- Zoom in or out of the preview 392
- Hide filter thumbnails 392
- Filter effects reference 395
- Brush Stroke filters 397
- Distort filters 397
- Noise filters 398
- Pixelate filters 399
- Render filters 399
- Stylize filters 401
- Texture filters 402
- Video filters 402
- Other filters 402
- Applying specific filters 403
- Defining undistorted areas 404
- Apply the Displace filter 404
- Add Lighting Effects 406
- Lighting Effects types 407
- Adjust an Omni light 407
- Lighting Effects styles 408
- Add or delete a light 408
- Chapter 14: Type 410
- Enter paragraph type 412
- Editing text 413
- Check and correct spelling 415
- Find and replace text 416
- Assign a language for text 416
- Rasterize type layers 417
- Formatting characters 418
- OpenType fonts 424
- Apply OpenType features 424
- Line and character spacing 426
- Adjust kerning 427
- Adjust tracking 427
- Scaling and rotating type 428
- Formatting paragraphs 429
- Prevent words from breaking 434
- Composition methods 434
- Creating type effects 435
- Asian type 440
- Use tate-chu-yoko 441
- Align Asian characters 442
- 5 Do one of the following: 443
- 7 Do one of the following: 443
- Specify a burasagari option 446
- Saving images 447
- Set file saving preferences 449
- Save large documents 449
- Saving PDF files 451
- PDF compatibility levels 454
- General options for Adobe PDF 455
- Adding security to PDF files 457
- Save an Adobe PDF preset 457
- File formats 466
- Photoshop format (PSD) 467
- Photoshop 2.0 format 467
- Photoshop EPS format 467
- PICT File 471
- PICT Resource 471
- Pixar format 472
- PNG format 472
- Portable Bit Map format 472
- Radiance format 472
- Scitex CT 472
- Metadata and annotations 473
- Annotating images 474
- Open and edit annotations 475
- Read a Digimarc watermark 476
- Embed a watermark 478
- Create a PDF presentation 479
- 6 Click OK 482
- 9 Click Save 485
- Chapter 16: Printing 490
- 3 Do one of the following: 492
- Print part of an image 494
- Print vector data 494
- Print a hard proof 496
- 1 Choose File > Print 499
- 2 Choose Image > Trap 504
- Estimate scan resolution 504
- Printing duotones 505
- Printing spot colors 508
- Chapter 17: Web graphics 512
- Slicing web pages 514
- View slices and slice options 516
- Modifying slices 517
- Duplicate slices 519
- Copy and paste a slice 519
- Combine slices 519
- Slice output options 521
- Creating web photo galleries 523
- Create a web photo gallery 524
- Web photo gallery options 525
- Web photo gallery styles 526
- Optimizing images 530
- Optimize an image for the web 532
- Save a file to e-mail 536
- Web graphic formats 537
- JPEG optimization options 537
- Optimization settings for SWF 546
- Optimization settings for SVG 547
- G. Encoding menu 547
- Set output options 548
- HTML output options 549
- Background output settings 550
- Saving Files output settings 550
- About animation 551
- Animation palette overview 553
- Change thumbnail size 554
- Creating images for video 556
- Aspect ratio 557
- 1 Create a new document 558
- Extended) 561
- Creating frame animations 571
- • Add a style to layers 572
- Add frames to an animation 573
- Select animation frames 573
- Create frames using tweening 576
- Choose a disposal method 578
- Delete an entire animation 579
- Preview video and animations 586
- 3G export settings 591
- DV Stream export settings 593
- Export image sequences 595
- Chapter 19: Technical imaging 597
- Remove stack rendering 603
- Edit an image stack 603
- Convert an image stack 603
- Measurement Data Points 607
- • Choose File > Open 612
- Change lighting effects 614
- Change rendering effects 614
- plane moves beyond 615
- Chapter 20: Automating tasks 617
- Play an action on a file 618
- Specify playback speed 618
- Manage actions 619
- Manage action sets 619
- Creating actions 621
- Record a path 622
- Insert a stop 622
- Edit and rerecord actions 624
- Processing a batch of files 625
- Process a batch of files 626
- Droplet icon 627
- Process a file with a droplet 628
- Scripting 629
- Creating data-driven graphics 630
- Define variables 631
- Rename a variable 633
- Define a data set 633
- Preview or apply a data set 633
- 4 Choose data sets to export 634
- 5 Click OK 634
- Import a data set 635
- Define new keyboard shortcuts 636
- Default keyboard shortcuts 637
- Keys for using Photomerge 644
- Keys for viewing images 646
- Keys for editing paths 648
- Keys for painting objects 649
- Keys for formatting type 650
- Keys for using palettes 651
- Function keys 658
- OLE (Object Linking and 672
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