KEYWORDS: CMYK color model, Data modeling, Data conversion, Printing, Image compression, Data centers, Space operations, Mathematical modeling, RGB color model, Digital image processing
A new technique is described for color conversions of JPEG images. For each input block of each
component, the conversion for the 63 AC coefficients is processed in the transform domain instead of the
spatial domain. Only the DC coefficients for each input block of the color components are transformed to
the spatial domain and then processed through the traditional lookup table to create color-converted output
DC coefficients for each block. Given each converted DC value for each block, the remaining 63 AC
coefficients are then converted directly in the transform domain via scaling functions that are accessed via a
table as a function of only the DC term. For n-dimensional color space to m-dimensional color space
conversion, n component blocks create m component blocks. An IDCT can then be applied to the m
component blocks to create spatial domain data or these output blocks can be quantized and entropy
encoded to create JPEG compressed data in the m-dimensional color space.
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