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Digital sepia tones
Many photographers prefer to use software, like Photoshop or The GIMP, because these offer more control over how much tint to apply the image, and exactly what hue. There is no single color known as "sepia" - the term covers a range of yellow and brown mixtures. More sophisticated software tends to implement sepia tones using the duotone feature. Simpler photo-editing software usually has an option to sepia tone an image in one step.
R' = (R × 0.393 + G × 0.769 + B × 0.189) / 1.351f; G' = (R × 0.349 + G × 0.686 + B × 0.168) / 1.203f; B' = (R × 0.272 + G × 0.534 + B × 0.131) / 2.140f; The sample photographs below show the process of removing color from a photograph, then applying a conversion to grayscale. The last sample photograph shows the same colored photograph converted to sepia. See alsoReferences
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