Reduce File Size Sepia Tone User-created filters can have color management, image effects, PDF retouch, domain selection and comments. The Color Management section allows assigning a profile, choosing a default profile, rendering intent, converting to a profile or intermediate transform. The Intermediate Transform section allows adjustment of brightness, tint, hue, saturation, bilevel (high pass filter) or profile assignment, to either grayscale, RGB or CMYK, or all data in the file. This can be applied to either text, graphics, images or shading. Complex filters can be created by stacking multiple effects. Any changes made to the PDF file can then be saved as a new PDF file. Calculator can convert between RGB, CMYK and other color value schemes, and features an interactive color-picker for identifying a color on the screen, duplicating a feature of another bundled utility, Digital Color Meter. ColorSync ColorSync is Apple Inc.'s color management API for the Classic Mac OS and macOS. Apple developed the original 1.0 version of ColorSync as a Mac-only architecture, which made it into an operating system release in 1993. In the same year, Apple co-founded the International Color Consortium (ICC) to develop a cross-platform profile format which became part of ColorSync 2.0. The system Color Management Module (CMM) was "LinoColorCMM", which was developed by Linotype-Hell AG (now part of Heidelberger Druckmaschinen AG). The same CMM was used in Microsoft Windows 2000 and XP under the rubric of "Image Color Management" (ICM). Apple, with the help of Adobe had ported ColorSync 2.0 and its SDK to Microsoft Windows. With ColorSync 3.0, the Windows version which was initially planned was discontinued. ColorSync 4.0 is the latest version, introduced in Mac OS X 10.1. To deal with color gamut issues, ColorSync provides several different methods of doing color matching. For instance, perceptual matching tries to preserve as closely as possible the relative relationships between colors, even if all the colors must be systematically distorted in order to get them to fit within the gamut of the destination device. Because the human eye is more sensitive to color differences rather than absolute colors, this method tends to produce the best-looking results, subjectively speaking, for many common uses, but there are other methods that work better in some cases. (This set of rendering intents is part of the ICC system, and is available on all systems with ICC.) As dictated by the ICC system, the profile connection space