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| macOS graphics model |
|---|
| Rendering |
| Compositing |
ColorSync isApple Inc.'scolor managementAPI for theClassic Mac OS andMac OS Xoperating systems.
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 theInternational Color Consortium (ICC) to develop across-platform profile format which became part of ColorSync 2.0.[1] The systemColor Management Module (CMM) was "LinoColorCMM", which was developed by Linotype-Hell AG (now part ofHeidelberger Druckmaschinen AG). The same CMM was used in Microsoft Windows 2000 and XP under the rubric of "Image Color Management" (ICM).[citation needed] Apple, with the help ofAdobe had ported ColorSync 2.0 and itsSDK toMicrosoft Windows. With ColorSync 3.0, the Windows version which was initially planned was discontinued. ColorSync 4.0 is the latest version, introduced inMac OS X10.1.
Humancolor perception is a very complex and subtle process, and different devices have widely different colorgamuts or ranges of color they can display. To deal with these 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 tocolor differences rather thanabsolute 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.
As dictated by the ICC system, theprofile connection space in ColorSync is theCIE XYZ color space. All image input and output devices (scanners, printers, displays) have to be characterized by providing anICC profile that defines how their color information is to be interpreted relative to this reference color space. This profile might be provided by the device manufacturer, but for better quality results, it might be generated by performing actual measurements on the device with acolorimeter. Thus, when an image is scanned on a scanner, the image file will include a copy of the scanner's profile to characterize the meaning of its color information. Then, before the image is sent to an output device, amatching process converts the color information at the time of rendering from thesource profile (that attached to the image) to thedestination profile (that attached to the output device) so that the resulting colors print or display as closely as possible to the original image.
| ColorSync Utility | |
|---|---|
| Developer | Apple Computer |
| Stable release | 12.0.0 |
| Operating system | macOS |
| Type | Graphics utility |
| License | Proprietary |
| Website | www |
ColorSync Utility is software that ships withMac OS X. It is used for management of color profiles and filters used in Apple'sPDFworkflow, or applying filters to images and PDF documents.[2]
The interface is composed of two parts: the document browser and the utility window. The document browser lets you zoom in and out of an image or apply a Filter to it. The utility window has several options: Profile First Aid, Profiles, Devices, Filters and Calculator.[3]
Filters set to Printing will appear in the drop-down menu under the "Save as PDF..." button in the standard Mac OS X print dialog box. Filters set to PDF Workflow will appear in theQuartz Filters drop-down menu in the ColorSync section of a print dialog box. The default filters that ship with Mac OS X are:
User-created filters can have color management, image effects, PDF retouch, domain selection and comments.
TheColor Management section allows assigning a profile, choosing a default profile,rendering intent, converting to a profile or intermediate transform.
TheIntermediate Transform section allows adjustment of brightness, tint, hue, saturation, bilevel (high pass filter) or profile assignment, to eithergrayscale,RGB orCMYK, 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 betweenRGB,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.
