Vulkan's HDR Decreases Gamma

Moderator: GZDoom Developers

Vulkan's HDR Decreases Gamma

Postby kinker31 » Fri Oct 09, 2020 4:42 pm

I'm not sure if this is something that has been introduced in the newest version, or if this is a problem with AMD chips, but recently, the Vulkan renderer's High Dynamic Range has been causing GZDoom to de-gamma the screen way more than it should, a -1 in gamma, to be exact. Although bumping the Gamma Correction up to 2 fixes the problem, this causes all screenshots I take to look overly bright/washed out. Turning off HDR lets the gamma work properly, but either sharpens the image like crazy in the process, or washes out the colors in strange ways, not sure which one it is. I currently run a Windows 10 Inside build (18363.1082), use an AMD Radeon (TM) R7 360 Series, and can indeed actually run the Vulkan renderer. I have some screenshots of this strange behavior below, the upper one with HDR on, and the bottom without HDR.

EDIT: I am indeed running the latest version of GZDoom too, I made sure to double-check.



User avatar
kinker31
Englishman who Went Up a Hill and Came Down with All the Bananas
 
Joined: 05 Feb 2018
Location: Does anyone actually put anything serious here?
Discord: kinker31#1062
Twitch ID: kinker31
Github ID: kinker31
Operating System: Windows 10/8.1/8/201x 64-bit
OS Test Version: Yes (Using Development/Testing Version)
Graphics Processor: ATI/AMD with Vulkan Support

Re: Vulkan's HDR Decreases Gamma

Postby GeneralDelphox » Fri Oct 16, 2020 10:14 am

I tried it for myself, and I'm not seeing anything wrong on my end. Though, I am using a NVIDIA GPU instead of AMD. I also used version 4.4.2 (the current stable release of GZDOOM as of making this post) while testing.

Vulkan with HDR


Vulkan without HDR


OpenGL
User avatar
GeneralDelphox
 
Joined: 30 Sep 2017
Discord: General Delphox#5567
Operating System: Windows 10/8.1/8/201x 64-bit
OS Test Version: No (Using Stable Public Version)
Graphics Processor: nVidia with Vulkan support


Return to Vulkan Renderer Bugs

Who is online

Users browsing this forum: No registered users and 0 guests