The CGSetDisplayTransferByTable() is not working on the latest round of Mac hardware, namely the MacBook Neo (external display), MacBook M5 Pro (both built-in and external display) and possibly the M5 Max. All tested apps (BetterDisplay, MonitorControl, f.lux, Lunar) exhibit the very issue both in macOS Tahoe 26.3 and macOS Tahoe 26.4 RC. Tested on multiple Macs and installations on the MacBook Neo and MacBook M5 Pro. This issue breaks several display related macOS apps. Way to reproduce the issue using an affected app: Install the app BetterDisplay (https://betterdisplay.pro) Launch the app, open the app menu, choose Image Adjustments and try to adjust colors. Adjustments take no effect Way to reproduce the issue programmatically: Attempt to use the affected macOS API feature: https://developer.apple.com/documentation/coregraphics/cgsetdisplaytransferbytable(::::_:) Here are the FB numbers: FB22273730 (Filed this one as a developer on an unaffected MBP M3 Max) FB22273782 (Filed from an affected MBP M5 Pro running 26.4 RC, with debug info attached)

I found an issue with macOS Reference Modes where a recreated custom preset does not match the grayscale response of the original Apple-provided preset, even when all visible settings appear to be identical. For example, when duplicating the built-in Apple Display P3-600 nits Reference Mode preset, the duplicated preset does not produce the same grayscale luminance response as the original system preset. The comparison is performed under the same physical display brightness setting. The difference is not caused by different brightness levels. The native Reference Mode preset and the recreated preset are tested at the same display brightness, but the grayscale response is still different. The same behavior also occurs when manually creating a new Reference Mode preset with equivalent parameters, including using Pure Gamma settings. Even when the gamma value and other visible parameters are matched, the grayscale transfer function in the shadow region does not match the original Apple preset. The difference can be observed using grayscale test patterns, including: BarsAndBlack_16bit.TIFF CT ColorBar test pattern With these test images, the recreated preset shows lifted dark tones compared with the original Apple Display P3-600 nits preset. The darker grayscale steps become brighter, indicating that the EOTF/grayscale response is not identical between the built-in preset and the recreated preset. This behavior can be reproduced using the built-in macOS Preview application. Opening the same test image and switching between the native Reference Mode preset and the recreated preset shows differences in the black level and shadow grayscale response. The issue can be reproduced on both macOS 26.4 and macOS 15. Environment: macOS: 26.4 (also reproducible on macOS 15) Mac: 14-inch MacBook Pro Display: Built-in XDR Display Reference Mode tested: Apple Display P3-600 nits The main question is: When there is a difference between the built-in Apple Reference Mode preset and a recreated preset with the same visible parameters, which one represents the intended and accurate gamma/EOTF response? Specifically: Is the built-in Apple Display P3-600 nits Reference Mode using additional internal calibration data or hidden parameters that are not exposed in the Reference Mode configuration UI? Is the recreated preset actually applying the requested gamma curve correctly, while the Apple preset includes additional processing? Or is the Apple built-in preset the accurate reference implementation, and the recreated preset cannot reproduce it because some internal display calibration information is unavailable? Is there a documented way to create a custom Reference Mode preset that exactly matches the grayscale response of an Apple system preset? Thank you.

Dear colleagues, when will you add the ability to manually adjust the display's color temperature? Everyone is familiar with the color rendering issue on the 17 series. Many complain about the display's yellowish tint. I'm one of those people, with a G9N panel, but I can't get whites right; there's a persistent yellow tint. TrueTone only solves this problem under cool, white lighting conditions. So, the display might work as intended, but how can I make it work consistently? If there were a way to manually adjust TrueTone, many users wouldn't be so upset when buying a new device, fearing the display would be yellow. I'd like users to be able to choose their preferred color, warm or cool, and have a scale to adjust it! This would solve the yellowish tint issue on 17 series displays! Thank you.

Dear Apple Color Management Team, I’m a professional visual creator working on color-critical photo and graphic projects using macOS (currently 26.1 Tahoe). In recent macOS releases, LUT-based ICC display profiles (such as XYZ LUT + Matrix types generated by DisplayCAL or professional spectrophotometers) can no longer be installed or activated via ColorSync. This limitation significantly affects professional workflows in photography, graphic design, prepress, and video color grading — fields that rely on precise display profiling. The current workaround (converting LUT profiles to simple shaper/matrix ICC v2) results in less accurate tone response and color reproduction, particularly in the dark range and wide-gamut displays. I kindly request Apple to restore or re-enable the ability to install and use ICC v2/v4 LUT-based display profiles under ColorSync, as was possible on macOS Monterey and Ventura. This would allow professionals to continue using trusted calibration tools such as DisplayCAL, X-Rite i1Profiler, and Calibrite Profiler to achieve accurate color management. macOS is widely used in professional creative industries, and restoring this feature would be a huge help for countless photographers, designers, and colorists. Thank you for your attention and commitment to professional users. Best regards, Richárd Deutsch Professional Photographer https://riccio.hu/ MacBook Pro (M4 Pro, macOS 26.1)

So I normally use the below as quick reference guide: https://mar.codes/apple-colors however, what is the reason that iOS colors are not available on tvOS? Especially the system/grays that are available on iOS. What does everyone else use for alternatives to these to get close matches between their multi platform apps?

I’m developing an iOS app, and I’ve noticed that when the user enables Accessibility → Display & Text Size → Color Filters → Grayscale, my app icon loses a lot of visual contrast. The original colored version looks fine, but in grayscale it appears “flat” and harder to distinguish, unlike a pure black-and-white design. What I want to achieve: Ensure the app icon remains visually clear and high-contrast even when iOS renders it in grayscale. Ideally, provide an alternate “high-contrast” app icon version when grayscale mode is enabled. What I’ve tried: Increased color contrast in the original icon design. Added outlines and stronger shapes. Tested with grayscale filters in design tools. Researched Asset Catalog and alternate icons, but found no documented API to detect or respond to grayscale mode. Questions: Is there any API in iOS that allows detecting when the system is in grayscale mode so that I can programmatically switch to an alternate app icon? If not, are there Apple-recommended best practices for designing app icons that still look clear in grayscale? Are there any accessibility guidelines specifically addressing icon design for grayscale or color-blind modes? Additional info: iOS version tested: iOS 17.5 Development in Swift + SwiftUI, using Asset Catalog for icons. I am aware that iOS supports alternate icons via setAlternateIconName, but I haven’t found a trigger for grayscale mode.

Hi, i'm unable to select a icc profile on the new macbook Pro M4. How can i calibrate the internal screen by adding an icc profil made with my X-Rite color calibrator. icc files cannot be selected (grey) from the import menu of the monitor preferences.

HStack{ FormLable(text: NSLocalizedString("Color", comment: "")) Spacer() Image(systemName: "circle.fill") .font(.system(size: AppFontSize.baseSize.size() * 1.2, weight: .medium)) .foregroundColor(color) .overlay(ColorPicker("Color", selection: $color).labelsHidden().opacity(0.015)) } This is how I use the color picker. I used the same code in two different apps, and the color picker appeared in one app but not in the other. By the way, I upgraded Xcode to the latest version.

How can I implement the same custom CIFilter as a Lightroom Color Grading tool for shadows, midtones, highlights and global areas?

ColorSync throughout the system interprets the Rec. ITU-R BT.709-5 color profile differently in macOS 15 than it did on macOS 14 leading to severe color differences. This is breaking/problem-causing color change. Here's a comparison of one way the results can appear different. Steps to Reproduce Open this image above (named here as sRGB_Bars.png) in ColorSync Utility. (This should be an sRGB profiled image if the forums don't mess with that.) With Digital Color Meter open and set to "Display in sRGB" [0-255] you can see the gray bars progress left-to-right as 0, 23, 46, 69, 92, 115, etc... ] Those are the correct reference values. At the bottom of the window in ColorSync use [Match to Profile] [Display -> Rec. ITU-R BT.709-5], then click the Apply Button. You can verify the image now uses the Rec 709 profile with the (i) Get Info button in the toolbar. Use "Save As…" to save the image with a different name. **) Do the steps above on macOS 14 and macOS 15 to create two images. Rec709_CreatedOnMacOS14, and Rec709_CreatedOnMacOS15. **) Compare the two images on BOTH operating system versions, and you'll see they are significantly different from each other. Rec709_CreatedOnMacOS14.png when viewed on macOS 15 has the gray values of: [0, 1, 18, 43, 67, ...] Rec709_CreatedOnMacOS14.png when viewed on macOS 15 has the gray values of: [0, 51, 72, 94, 115, ... ] These are MASSIVE differences. Significance This is not just a problem that affects ColorSync Utility or Preview, etc. This same gamma interpretation difference is affecting the Core Video, Core Image, Video Toolbox, etc pipelines as well. That gets complicated to talk about, and this is example is the simplest I can boil it down to. Conclusion Significant bug? What's going on?

Hi, I'm looking at being able to set a display colour profile via terminal. I know apps such as SwitchResX are able to change this but i can't figure out how and if it is possible to switch via a terminal command or via a script. This here is what i would like to change. I have googled about and searched through preference files but can't find anything. Any help is much apreciated. Thanks, James

When rendering gradient of luma values you can clearly see that the monitor output from Apple Silicon GPU has lifted/curved blacks (values 0-31 out of 1024 in 10-bit output). Any idea what is going on and how to remediate? It looks like some kind of compensation/calibration for the screen panel response, but it is baked into output regardless of what kind of monitor (or non-monitor) is connected. The same rendering on Intel architecture produces correct linear gradation. We have tried M1, M2, M3 and they all seem to be affected.

When changing icc profile in macOS14.x, app may get 2 "NSApplicationDidChangeScreenParametersNotification". And some platform is normal like M2 Pro Mac mini v14.4.1 will receive once. Any idea about this symptom?

Hello - I’m creating an app that needs to copy ColorSync profiles to the /Library/ColorSync/Profiles directory on macOS and was wondering what is the correct / sanctioned way to write to the /Library directory is? The app won’t be in the App Store. The app needs to run on Big Sur through Sonoma. I spent some time working with ColorSyncProfileInstall() but that seems to want to ask the user permission every single time the function is called - and this app can install up to 25 profiles at a time. (There are actually hundreds of profiles that can be chosen that will come from a server). I’m currently looking at using SMJobBless but that sure seems like using an atomic bomb to swat a mosquito. Any thoughts if SMJobBless is the right way to go? (SMAppService for 13 and on). Thanks!

Hey, Guys. I would like to build my own Colorsync App of iOS. How can do?

Hey, Guys. I would like to build the my own Colorsync App of iOS. How can do?

Content: I would like to suggest the addition of a feature in Apple's default Notes app that allows users to customize the color of the outlines of their text, in addition to the font and font color. It would be helpful if users could choose bright colors, such as fluorescent or white, to make their text stand out more, especially when the screen is dark and they want to use a dark font. I believe this would make the app more visually appealing and user-friendly.

How do I get an ICC profile into a form I can embed into an image using Apple Script/Image Events? I'm using the form below make new profile with properties {location:"Macintosh HD/Users/user_N/Desktop/sRGB Profile.icc"}" embed this_image with source profile I've also tried setting the color space property of the image. set the color space of this_image to RGB of course there is more to the code but that is just the part I'm having issues with. I get the error message "Image got an error: can't make profile into type profile" and, error "The variable profile is not defined." number -2753 from "profile" What am I missing here, Anyone know?

Recently, I have matter of should change color of so many photos about 80000 picts. But, It's to hard to change it one by one. Actually, I want to change color with ''Match to image with ColorSync profile" of "Automator". But, I don't know some method to do it. Please teach me some method to do it. Should Ito create some profile in mac? Or, Should I search for other method? If I can create some profile, Please teach me the method both. (The pictures are taken by old film camera. There are already changed to digital image.) (They have color of "sepia color". I have to change color to "Normal".)

I recently came across a program that used data tables to invert the display, however it was a windows only application and I am wondering how I can write a similar thing for Mac, or if there is one already available. The app and config file is attached below so you can sort of dissect how it works Config File: [negativescreen.conf](https://developer.apple.com/forums/content/attachment/f4b67ed7-fa71-4ee6-9c0d-18febe2c3381) Readme file: [README.md](https://developer.apple.com/forums/content/attachment/86bd72f6-46c9-42d5-a925-561f75f24ae8) Window$ Executable: [NegativeScreen.exe](https://developer.apple.com/forums/content/attachment/a4478bd5-d5c7-41dd-9302-0e1a929372c2)