Precise, consistent colormanagement requires accurate ICC-compliant profiles of all of yourcolor devices. For example, without an accurate scanner profile,a perfectly scanned image may appear incorrect in another program,simply due to any difference between the scanner and the programdisplaying the image. This misleading representation may cause youto make unnecessary, time-wasting, and potentially damaging “corrections”to an already satisfactory image. With an accurate profile, a programimporting the image can correct for any device differences and displaya scan’s actual colors.
A color management system uses the following kinds of profiles:
Describehow the monitor is currently reproducing color. This is the firstprofile you should create because viewing color accurately on your monitorallows for critical color decisions in the design process. If whatyou see on your monitor is not representative of the actual colorsin your document, you will not be able to maintain color consistency.
Describewhat colors an input device is capable of capturing or scanning.If your digital camera offers a choice of profiles, Adobe recommendsthat you select Adobe RGB. Otherwise, usesRGB (which is the default for most cameras). Advanced users mayalso consider using different profiles for different light sources.For scanner profiles, some photographers create separate profilesfor each type or brand of film scanned on a scanner.
Check out our other videos and blog posts at http://www.cityinkexpress.co.uk. Show how to setup and change the settings for your Sublimation profile using this software.
Describethe color space of output devices like desktop printers or a printingpress. The color management system uses output device profiles toproperly map the colors in a document to the colors within the gamut ofan output device’s color space. The output profile should also takeinto consideration specific printing conditions, such as the typeof paper and ink. For example, glossy paper is capable of displayinga different range of colors than matte paper.
Most printerdrivers come with built‑in color profiles. It’s a good idea to trythese profiles before you invest in custom profiles.
(Not applicable toPDFs) Define the specific RGB or CMYK color space of a document.By assigning, or tagging, a document with a profile, theapplication provides a definition of actual color appearances inthe document. For example, R=127, G=12, B=107 is just a set of numbersthat different devices will display differently. But when taggedwith the Adobe RGB color space, these numbersspecify an actual color or wavelength of light—in this case, a specificcolor of purple.
When color management is on, Adobe applicationsautomatically assign new documents a profile based on WorkingSpace options in the Color Settings dialog box.Documents without assigned profiles are known as untagged andcontain only raw color numbers. When working with untagged documents,Adobe applications use the current working space profile to displayand edit colors.
A. Profiles describe the color spaces of the input deviceand the document. B. Using the profiles’ descriptions,the color management system identifies the document’s actual colors. C. The monitor’sprofile tells the color management system how to translate the document’snumeric values to the monitor’s color space. D. Usingthe output device’s profile, the color management system translatesthe document’s numeric values to the color values of the outputdevice so the correct appearance of colors is printed.
Profiling software can bothcalibrate and characterize your monitor. Calibrating yourmonitor brings it into compliance with a predefined standard—forexample, adjusting your monitor so that it displays color usingthe graphics arts standard white point color temperature of 5000° K(Kelvin). Characterizing your monitor simply createsa profile that describes how the monitor is currently reproducing color.
Monitor calibration involves adjusting the following video settings:
The overall level and range, respectively, of display intensity.These parameters work just as they do on a television. A monitor calibrationutility helps you set an optimum brightness and contrast range for calibration.
The brightness of the midtone values. The values producedby a monitor from black to white are nonlinear—if you graph thevalues, they form a curve, not a straight line. Gamma defines thevalue of that curve halfway between black and white.
The substances that CRT monitors use to emit light. Different phosphorshave different color characteristics.
The color and intensity of the brightest white the monitorcan reproduce.
When you calibrate your monitor,you are adjusting it so it conforms to a known specification. Onceyour monitor is calibrated, the profiling utility lets you savea color profile. The profile describes the color behavior of themonitor—what colors can or cannot be displayed on the monitor andhow the numeric color values in an image must be converted so thatcolors are displayed accurately.
Make sure your monitor has been turned on for at least half an hour. This gives it sufficient time to warm up and produce more consistent output.
- Make sure your monitor is displaying thousands of colorsor more. Ideally, make sure it is displaying millions of colorsor 24‑bit or higher.
Remove colorful background patterns on your monitor desktop and set your desktop to display neutral grays. Busy patterns or bright colors surrounding a document interfere with accurate color perception.
- Do one of the following to calibrate and profile yourmonitor:
In Windows, installand use a monitor calibration utility.
In Mac OS, use the Calibrate utility, locatedon the System Preferences/Displays/Color tab.
For the best results, use third-party software andmeasuring devices. In general, using a measuring device such asa colorimeter along with software can create more accurate profilesbecause an instrument can measure the colors displayed on a monitorfar more accurately than the human eye.
Note:
Monitor performance changes and declines over time;recalibrate and profile your monitor every month or so. If you findit difficult or impossible to calibrate your monitor to a standard,it may be too old and faded.
Most profiling software automatically assigns the newprofile as the default monitor profile. For instructions on howto manually assign the monitor profile, refer to the Help systemfor your operating system.
Colorprofiles are often installed when a device is added to your system.The accuracy of these profiles (often called generic profiles or cannedprofiles) varies from manufacturer to manufacturer. You canalso obtain device profiles from your service provider, downloadprofiles from the web, or create custom profiles usingprofessional profiling equipment.
- In Windows, right-clicka profile and select Install Profile. Alternatively, copy the profilesinto the WINDOWSsystem32spooldriverscolor folder.
- In Mac OS, copy profiles into the /Library/ColorSync/Profilesfolder or the /Users/[username]/Library/ColorSync/Profilesfolder.
After installing color profiles, be sure to restart Adobeapplications.
You can embed a color profile in an object. Acrobat attaches the appropriate profile, as specified in the Convert Colors dialog box, to the selected objects in the PDF. For more information, see Color conversion and ink management (Acrobat Pro).
You convert colors
Overview
If you are used to preparing images in Adobe Photoshop or Adobe Lightroom using Adobe RGB or ProPhoto RGB color profiles, you have probably been preparing images for consistent print quality.
To prepare your images for consistent display quality you’ll need to convert files to the sRGB color profile.
What is a Color Profile
The International Color Consortium (ICC) has a standard for an ICC Profile that defines the rules for managing color on input devices (such as cameras and scanners) and output devices (such as printers and monitors).
Adobe Icc Profiles Mac
Here are some key color profiles you need to know about:
- Adobe RGB and ProPhoto RGB: Color profiles used in Adobe Photoshop and Adobe Photoshop Lightroom – primarily for preparing images for print.
- sRGB: the color profile used by most web browsers to display images on the web.
Mixing color profiles can lead to washed out / dull images
If you take an image with either an Adobe RGB or ProPhoto RGB color profile and display it in a web browser, the colors may look washed out or dull.
To avoid this occurring, convert the image to sRGB format before it is displayed in a web browser.
*Note: Safari has for some time supported the color profile recorded for an image. Firefox 3.5.2 (Aug 09) introduced standard support for ICC color profiles.
Converting the color profile to sRGB
If you have images with the Adobe RGB or ProPhoto RGB color profile, to convert them to sRGB:
- In Adobe Photoshop – see detailed instructions and screenshots below
- In Adobe Lightroom, choose File, Export and set the Color Space to sRGB.
After you have converted the image to sRGB, check that the colors are the way you want them.
Exporting files with ICC Color Profiles
In Photoshop you can choose to include or exclude the ICC color profile metadata when you choose Save As to save an image for the web. Note this only affects whether the file is ‘tagged’ with the color profile – the colors embedded in the image remain the same.
There are pros and cons to leaving the color profile off. Leaving the ICC color profile off can result is potentially a better option for images on the web:
- the file size is slightly smaller.
- you may avoid problems with untagged sRGB files being displayed differently to tagged sRGB files.
More information
If you want to find out more about color profiles and the rationale for using sRGB for your web images, here are some links:
- Web Browser Color Management Tutorial, by Greg Ballard
- Embedding Tagging ICC Profiles in Web Images, by Greg Ballard
- Digital Image Color Spaces by Jeffrey Friedl
- Web Browser Color Management Guide and Color Management Test by Fabio Pili of Gear Oracle
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