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Notmasteryet (talk | contribs) (Created page with "== Abstract == This page is a specification for the custom EMBED JPEG marker. Most of the JPEG images contain the color information in YCbCr color model. To include the informat...") |
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<p style="font-size:140%; font-weight: bold; color: navy">EMBED JPEG Marker for Adobe CMYK Images</p> | |||
<p style="font-size:120%; text-style: italic; color: navy">(Draft Recommendation)</p> | |||
== Abstract == | == Abstract == | ||
This page is a specification for the custom EMBED JPEG marker. Most of the JPEG images contain the color information in YCbCr color model. To include the information base on other color models (e.g. RGB or CMYK), | This page is a specification for the custom EMBED JPEG marker. Most of the JPEG images contain the color information in the YCbCr color model. To include the information base on other color models (e.g. RGB or CMYK), format vendors have to include some additional information via JPEG extensions -- application markers. | ||
Adobe introduced the following extensions via APP14 'Adobe' marker (see [http://partners.adobe.com/public/developer/en/ps/sdk/5116.DCT_Filter.pdf Supporting the DCT Filters in PostScript Level 2, Technical Note #5116, Paragraph 18]) The specification was not clear about the CMYK color model components value meaning: is 0 represents absence of the color or its presence (CMYK is a subtractive model). From the http://www.jpegcameras.com/libjpeg/libjpeg-3.html: | Adobe introduced the following extensions via APP14 'Adobe' marker (see [http://partners.adobe.com/public/developer/en/ps/sdk/5116.DCT_Filter.pdf Supporting the DCT Filters in PostScript Level 2, Technical Note #5116, Paragraph 18]) The specification was not clear about the CMYK color model components value meaning: is 0 represents absence of the color or its presence (CMYK is a subtractive model). From the http://www.jpegcameras.com/libjpeg/libjpeg-3.html: | ||