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Questions tagged [hdr]

High Dynamic Range (HDR) is a term used for image and video, referring to an extended range than normal 8-bit-per-color channel precision, enabling representation of a wider range of luminance and complete color gamut.

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How to create thumbnails from HDR video with FFmpeg?

I using FFmpeg to create thumbnails from HDR videos recorded with an iPhone but the colors of the generated JPG file look washed out. Here is a screenshot I took while running the video in a player and the other picture is a JPG generated with…
schneikai
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Get EXR image luminance

As far as i know, I think to get an image.exr luminance we have to render the image in different exposure and gather them into one ? Here is my image made in Adobe which have different luminance from 0(left) to 10 (right) in exr…
huangkaiyi
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Is there a simple way to show an image with a color depth of 10 bits on screen using Python?

I have a use case where I get images from Carla simulator buffer in a python script, running on a Win10 localhost, and I want to show these images on an HDR screen in a full 10 bit color depth. Unfortunately I have not found a library yet that is…
roque2205
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get 10-bit RGB value from 10 bit video

I tried to extract frames from 10 bit video using ffmpeg: ffmpeg -i 10-bit-video.mp4 -pix_fmt rgb16be test_%03d.png and that's 16-bit png with max value of 65535 how to get corresponding 10-bit RGB value (0-1023) from extracted 16-bit PNG?
Yineng Xiong
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Unity: Cannot obtain information from an HDR display. HDR is not enabled in the player settings for this project

I am trying to enable HDR output in Unity 2020.3.2f1 by calling RequestHDRModeChange HDROutputSettings.main.RequestHDRModeChange(true); but I receive an exception saying: Cannot obtain information from an HDR display. HDR is not enabled in the…
erkil1452
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Windows API to get whether HDR(High Dynamic Range) is active

My environment is Windows 10 20H2(64bit) and Visual Studio 2019. I am developing an app as C# WPF(.NET 5) project. And I want to write a code that HDR(High Dynamic Range) is active currently on the system. In this document, I got some hints about…
Tank2006
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HDR-fusion - when to use what method?

I am studying different methods for hdr-fusion in the opencv-tutorial here: https://docs.opencv.org/master/d2/df0/tutorial_py_hdr.html I am also reading various articles. However, I don't seem to find any information on when I such use which method,…
Henrik Leijon
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Powershell script to activate HDR in Windows 10

I've scoured the net for resources on this, to no avail. I cannot find the syntax to toggle HDR in Windows 10. As it currently stands, the GUI function for this is buried in a menu, and is a huge pain in the ass to turn on and off per application as…
zreilly
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Reading HDR photo in Android with RGBA_F16 and accessing single pixel from buffer

AFAIK HDR images in PNG are saved as integer values in 16-bit depth. But in Android SDK I can read HDR image with configuration Config.RGBA_F16, which has a very interesting description: Each pixels is stored on 8 bytes. Each channel (RGB and alpha…
404pio
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How to save a non normalized cv::Mat with imwrite in opencv?

I'm currenty trying to save a cv::Mat of type CV_64FC3 to my harddisk of float values between about 0 and 5. If you want to know why, read below. I have been looking into saving it in hdr format, but if I just call imwrite("myname.hdr",…
Amber Elferink
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H.264 to DNxHR 444 issue. Colors are not transcoded correctly (HDR project). Note: issue not solved yet

I'm having an issue transcoding a H.264 UHD HDR file to a DNxHR file in a mxf container with FFmpeg. The issue is that both files don't look the same at all, the colors look washed out on the DNxHR video, and I tried to make the transcoding as…
Raulo1985
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Any comparison studies of advantage and drawbacks of High vs Standard Dynamic Range for machine vision techniques?

My intuition says that a High Dynamic Range image would provide more stable features and edges for various image segmentation and other low level vision algorithms to work with - but then it could go the other way with the larger number of bits…
norlesh
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SceneKit Swift - using HDR environment light map from file

I'm trying to use a spherical HDR image as the environment light in a Swift project using SceneKit and am having trouble using standard 32bpc HDR imaging formats to do it. I can use PNG maps easily, but have trouble loading images from an OpenEXR…
Mitchell Kehn
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What is the difference between Static HDR and dynamic HDR?

HDR is a high dynamic range which is widely used in video devices to have better viewing experience. What is the difference between static HDR and dynamic HDR?
stackuser
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Uploading HDR photo from iPhone to web - GPS data missing

I've got a photo uploading website that allows people to upload photos from their phones onto a map. All is working well with photos uploaded from iPhone and Android with no issues. However, I have got a problem with iPhone HDR photos. They don't…
Ted
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