Color Conversion in PDF Compression
Color Conversion
Optional. Enable this value by adding it to the profile and setting it equal to "on."
We can see thousands of different shades of colors, and high-quality digital cameras and scanners can often detect millions of shades. To manage the broad range of colors for producing graphics images in digital content, imaging professionals have developed models to define these colors, called color spaces.
Many color spaces have been defined. Some are dependent on hardware devices, and define what a camera can detect, or a printer print, or a monitor display. Others are based on software and thus can be used across many different types of devices, such as Adobe RGB or sRGB (standard RGB). A color space must be defined for any device or software product to make sure that coloring patterns remain the same from one device or system to another.
The Standard RGB color space, sRGB, was developed by Microsoft and Hewlett Packard to describe colors available on most monitors and displays. This color space is also commonly used for web graphics.
Adobe Systems’ own Adobe RGB (Red/Green/Blue) color space is designed to hold all of the colors that are likely to be available on any color CMYK (Cyan/Magenta/Yellow/Black) printer. It is considerably larger than Standard RGB.
Color profiles are standards for managing colors, used to ensure that the colors for text or graphics in a file remain the same regardless of the hardware or software used to display, edit, or print that file. Color profiles are based on the specification created by the International Color Consortium (ICC) in 1993 to govern color and color management across all operating systems, platforms, and software and hardware and software systems. A color profile is usually expressed as a file included in the software or driver for an installed printer, scanner or other hardware device, or in software used to edit a file that is to be displayed or printed. A profile provides a set of data that describes an input or output device. A color profile file can also be embedded in a PDF document.
Convert Profile
These settings are used to enable color conversion and to convert colors in the PDF document.
Lab color specification with a D50 white point. The Lab color space is based on the CIE XYZ color space, but it includes a dimension L, for lightness, along with a and b coordinates, to define the color. This is Adobe Systems’ standard Lab profile.
Convert Intent
These settings are used to enable convert-intent, and for the color translation method used.The intent lets the software determine how to substitute a color that can be written to the file. You can select from a list of standard strategies to apply when converting the colors in that original PDF document.
The conversion intent is used to describe how the destination device for the document reproduces the colors in the document. Thus, when you print or display the PDF output file, the colors in the output file will match as closely as possible the original color found in the source PDF document.
Generally used for photography. This method does not map colors one for one but estimates to match colors. Hence it often provides the most pleasing result but not necessarily the most accurate.