Grayscale image: Difference between revisions
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{{task|Image processing}} |
{{task|Image processing}} |
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Many image processing algorithms are defined for [[wp:Grayscale|grayscale]] (or else monochromatic) images. |
Many image processing algorithms are defined for [[wp:Grayscale|grayscale]] (or else monochromatic) images. |
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L = 0.2126·R + 0.7152·G + 0.0722·B |
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;Task: |
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Extend the data storage type defined [[Basic_bitmap_storage|on this page]] to support grayscale images. |
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Define two operations, one to convert a color image to a grayscale image and one for the backward conversion. |
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To get luminance of a color use the formula recommended by [http://www.cie.co.at/index_ie.html CIE]: |
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<big> L = 0.2126 × R + 0.7152 × G + 0.0722 × B </big> |
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When using floating-point arithmetic make sure that rounding errors would not cause run-time problems or else distorted results when calculated luminance is stored as an unsigned integer. |
When using floating-point arithmetic make sure that rounding errors would not cause run-time problems or else distorted results when calculated luminance is stored as an unsigned integer. |
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<br><br> |
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=={{header|Ada}}== |
=={{header|Ada}}== |
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