# OpenCV trackbars not showing values on MacOS **URL:** \ **Category:** Python\ **Tags:** highgui, apple\ **Created:** [February 13, 2022, 5:07pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551 "2022-02-13T17:07:03Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![elspops](https://avatars.discourse-cdn.com/v4/letter/e/5f9b8f/32.png) [@elspops](https://forum.opencv.org/u/elspops)\ **Post date:** [February 13, 2022, 5:07pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551/1 "2022-02-13T17:07:03Z")
Hi I am trying to use colour detection for my Raspberry Pi car I’ve made this colour picker script and the track bar works but it doesn’t display the numeric values just the bars. Can anyone help with this? ![Screenshot 2022-02-13 at 17.03.52](https://us1.discourse-cdn.com/flex020/uploads/opencv/original/2X/b/bece7594b092536b86a950ecb2dcfbe2176a38b4.png) ---
**Author:** ![berak](https://avatars.discourse-cdn.com/v4/letter/b/85f322/32.png) [@berak](https://forum.opencv.org/u/berak)\ **Post date:** [February 13, 2022, 5:28pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551/4 "2022-02-13T17:28:58Z")
please – NO SCREENSHOTS of ode or errors here. remove them and replace with TEXT, thank you. apart from that – what is it now ? macos ? raspi ? what did you install ? how so ? ---
**Author:** ![elspops](https://avatars.discourse-cdn.com/v4/letter/e/5f9b8f/32.png) [@elspops](https://forum.opencv.org/u/elspops)\ **Post date:** [February 13, 2022, 5:39pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551/5 "2022-02-13T17:39:03Z")
Oh okay I’m sorry I didn’t know. I’ve removed the code screenshots. It just doesn’t show the values/ numbers on my trackbars. I have opencv-python and opencv-contrib-python in pycharm as packages I’m working on MacOS Monterey. ---
**Author:** ![berak](https://avatars.discourse-cdn.com/v4/letter/b/85f322/32.png) [@berak](https://forum.opencv.org/u/berak)\ **Post date:** [February 13, 2022, 6:45pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551/6 "2022-02-13T18:45:17Z")
> [@elspops](#): > > I have opencv-python and opencv-contrib-python not the problem here, but use ONE of those, not both. what does `cv2.getBuildInformation()` say about the GUI backend used here ? ---
**Author:** ![elspops](https://avatars.discourse-cdn.com/v4/letter/e/5f9b8f/32.png) [@elspops](https://forum.opencv.org/u/elspops)\ **Post date:** [February 13, 2022, 6:50pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551/7 "2022-02-13T18:50:07Z")
Oh okay, and I have added cv2.getBuildInformation() to the script and it outputs: import sys; print(‘Python %s on %s’ % (sys.version, sys.platform)) sys.path.extend and then just the path to my project. Is the issue something to do with my opencv? On Mac it won’t show the trackbar values I’ve tried searching everywhere and no one has a solution to it. ---
**Author:** ![berak](https://avatars.discourse-cdn.com/v4/letter/b/85f322/32.png) [@berak](https://forum.opencv.org/u/berak)\ **Post date:** [February 13, 2022, 6:52pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551/8 "2022-02-13T18:52:44Z")
no, i meant: ``` print(cv2.getBuildInformation()) ``` and show us the output (at least the GUI section) ---
**Author:** ![elspops](https://avatars.discourse-cdn.com/v4/letter/e/5f9b8f/32.png) [@elspops](https://forum.opencv.org/u/elspops)\ **Post date:** [February 13, 2022, 6:57pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551/10 "2022-02-13T18:57:26Z")
Sorry actually do you want me to copy and paste it all as text and I’ll remove the screenshot? ---
**Author:** ![berak](https://avatars.discourse-cdn.com/v4/letter/b/85f322/32.png) [@berak](https://forum.opencv.org/u/berak)\ **Post date:** [February 13, 2022, 7:00pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551/11 "2022-02-13T19:00:56Z")
pleeeaaase ! (again, at least we need the GUI section) ---
**Author:** ![elspops](https://avatars.discourse-cdn.com/v4/letter/e/5f9b8f/32.png) [@elspops](https://forum.opencv.org/u/elspops)\ **Post date:** [February 13, 2022, 7:01pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551/12 "2022-02-13T19:01:52Z")
Ok sorry! Here is the ouput: General configuration for OpenCV 4.5.4 ===================================== Version control: 4.5.4 Platform: Timestamp: 2021-11-19T20:31:27Z Host: Darwin 20.6.0 x86\_64 CMake: 3.22.0 CMake generator: Unix Makefiles CMake build tool: /usr/bin/make Configuration: Release CPU/HW features: Baseline: SSE SSE2 SSE3 SSSE3 SSE4\_1 requested: DETECT Dispatched code generation: SSE4\_2 FP16 AVX AVX2 AVX512\_SKX requested: SSE4\_1 SSE4\_2 AVX FP16 AVX2 AVX512\_SKX SSE4\_2 (1 files): + POPCNT SSE4\_2 FP16 (0 files): + POPCNT SSE4\_2 FP16 AVX AVX (4 files): + POPCNT SSE4\_2 AVX AVX2 (30 files): + POPCNT SSE4\_2 FP16 FMA3 AVX AVX2 AVX512\_SKX (5 files): + POPCNT SSE4\_2 FP16 FMA3 AVX AVX2 AVX\_512F AVX512\_COMMON AVX512\_SKX C/C++: Built as dynamic libs?: NO C++ standard: 11 C++ Compiler: /usr/local/opt/ccache/libexec/clang++ (ver 13.0.0.13000029) C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D\_DEBUG C Compiler: /usr/local/opt/ccache/libexec/clang C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D\_DEBUG Linker flags (Release): -Wl,-dead\_strip Linker flags (Debug): -Wl,-dead\_strip ccache: YES Precompiled headers: NO Extra dependencies: -framework OpenCL /Applications/Xcode\_13.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/System/Library/Frameworks/Accelerate.framework -lm -ldl -framework Cocoa -framework AppKit 3rdparty dependencies: libprotobuf ade ittnotify libjpeg-turbo libwebp libpng libtiff libopenjp2 IlmImf zlib quirc ippiw ippicv OpenCV modules: To be built: calib3d core dnn features2d flann gapi highgui imgcodecs imgproc ml objdetect photo python3 stitching video videoio Disabled: java world Disabled by dependency: - Unavailable: python2 ts Applications: - Documentation: NO Non-free algorithms: NO GUI: COCOA Cocoa: YES VTK support: NO Media I/O: ZLib: build (ver 1.2.11) JPEG: build-libjpeg-turbo (ver 2.1.0-62) WEBP: build (ver encoder: 0x020f) PNG: build (ver 1.6.37) TIFF: build (ver 42 - 4.2.0) JPEG 2000: build (ver 2.4.0) OpenEXR: build (ver 2.3.0) HDR: YES SUNRASTER: YES PXM: YES PFM: YES Video I/O: DC1394: NO FFMPEG: YES avcodec: YES (58.134.100) avformat: YES (58.76.100) avutil: YES (56.70.100) swscale: YES (5.9.100) avresample: YES (4.0.0) GStreamer: NO AVFoundation: YES Parallel framework: GCD Trace: YES (with Intel ITT) Other third-party libraries: Intel IPP: 2020.0.0 Gold [2020.0.0] at: /Users/runner/work/opencv-python/opencv-python/\_skbuild/macosx-11.0-x86\_64-3.10/cmake-build/3rdparty/ippicv/ippicv\_mac/icv Intel IPP IW: sources (2020.0.0) at: /Users/runner/work/opencv-python/opencv-python/\_skbuild/macosx-11.0-x86\_64-3.10/cmake-build/3rdparty/ippicv/ippicv\_mac/iw Lapack: YES (/Applications/Xcode\_13.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/System/Library/Frameworks/Accelerate.framework -lm -ldl) Eigen: NO Custom HAL: NO Protobuf: build (3.5.1) OpenCL: YES (no extra features) Include path: NO Link libraries: -framework OpenCL Python 3: Interpreter: /Users/runner/work/opencv-python/opencv-python/venv/bin/python (ver 3.10) Libraries: /Library/Frameworks/Python.framework/Versions/3.10/lib/libpython3.10.dylib (ver 3.10.0) numpy: /private/var/folders/24/8k48jl6d249\_n\_qfxwsl6xvm0000gn/T/pip-build-env-iyx0bpj4/overlay/lib/python3.10/site-packages/numpy/core/include (ver 1.21.2) install path: python/cv2/python-3.10 Python (for build): /Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7 Java: ant: /usr/local/bin/ant (ver 1.10.12) JNI: /Users/runner/hostedtoolcache/Java\_Temurin-Hotspot\_jdk/8.0.312-7/x64/Contents/Home/include /Users/runner/hostedtoolcache/Java\_Temurin-Hotspot\_jdk/8.0.312-7/x64/Contents/Home/include/darwin /Users/runner/hostedtoolcache/Java\_Temurin-Hotspot\_jdk/8.0.312-7/x64/Contents/Home/include Java wrappers: NO Java tests: NO Install to: /Users/runner/work/opencv-python/opencv-python/\_skbuild/macosx-11.0-x86\_64-3.10/cmake-install ---
**Author:** ![elspops](https://avatars.discourse-cdn.com/v4/letter/e/5f9b8f/32.png) [@elspops](https://forum.opencv.org/u/elspops)\ **Post date:** [February 13, 2022, 7:02pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551/13 "2022-02-13T19:02:32Z")
And sorry which GUI section do you need? How can I show you that? Thank you ---
**Author:** ![berak](https://avatars.discourse-cdn.com/v4/letter/b/85f322/32.png) [@berak](https://forum.opencv.org/u/berak)\ **Post date:** [February 13, 2022, 7:07pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551/15 "2022-02-13T19:07:15Z")
no its alright now, we can see: > [@elspops](#): > > GUI: COCOA > Cocoa: YES > VTK support: NO it also seems to be [an ongoing, unresolved issue](https://github.com/opencv/opencv/issues/5056) ---
**Author:** ![elspops](https://avatars.discourse-cdn.com/v4/letter/e/5f9b8f/32.png) [@elspops](https://forum.opencv.org/u/elspops)\ **Post date:** [February 13, 2022, 7:08pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551/16 "2022-02-13T19:08:55Z")
Oh okay. Yeah I know i’ve already been on that page and it doesn’t look like there’s a solution to it. ---
**Author:** ![berak](https://avatars.discourse-cdn.com/v4/letter/b/85f322/32.png) [@berak](https://forum.opencv.org/u/berak)\ **Post date:** [February 13, 2022, 11:22pm UTC](https://forum.opencv.org/t/opencv-trackbars-not-showing-values-on-macos/7551/18 "2022-02-13T23:22:31Z")
i simply think, there is no code to draw tickmarks (or associated numbers) [here](https://github.com/opencv/opencv/blob/4.x/modules/highgui/src/window_cocoa.mm#L931)