Physically Based Rendering, 2nd Edition

I

ideal sampling, 327–331

identity matrix, 76, 87

identity transformation, 76

illumination algorithms, 751

image contribution function, 836

image file input/output, 1003–1004

image film, 404–413

color alternatives, 406

configuration, 405

crop window, 405–406

discrete integer pixels, 409

extent computation, 406

filter table offsets, 410

filter weight table computation, 407

looping, 409, 410

mutex use, 410

pixel updates, 411

pixel values, 408

pixel weight, 409

storage allocation, 407

XYZ color, 406

image pixels, 323

image pyramids

defined, 529

EWA filter, 541

implementation, 530

image sampling interface, 338–346

image textures, 523–544

caching, 524–527

defined, 523

elliptically weighted average (EWA), 539–544

example illustration, 523

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