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## LuminanceSourceAbstract.php

Class LuminanceSourceAbstract

##### Tags

created

  24.01.2021

author

  ZXing Authors

author

  Ashot Khanamiryan

author

  Smiley smiley@chillerlan.net

copyright

  2021 Smiley

license

  Apache-2.0

### Interfaces, Classes, Traits and Enums

LuminanceSourceAbstract
  The purpose of this class hierarchy is to abstract different bitmap implementations across platforms into a standard interface for requesting greyscale luminance values. The interface only provides immutable methods; therefore crop and rotation create copies. This is to ensure that one Reader does not modify the original luminance source and leave it in an unknown state for other Readers in the chain.

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