Postium Korea OBM-U248K Overview
 
Monitor your 4K or 8K studio or field production with the OBM-U248K 24" HDR 8K LCD Monitor from Postium Korea. With full input support for signals up to 8K60, the OBM-U248K offers 3840 x 2160 display resolution and a 178° viewing angle, with a brightness of 540 cd/m² and a 1200:1 contrast ratio. It features four 12G-SDI inputs, which can be used as single-link inputs for resolutions up to DCI 4K, and quad-link inputs for bringing in 8K. Four 12G-SDI loop outputs allow you to send up to four separate signals to other destinations. An HDMI 2.0 input and two SFP optical inputs provide additional options for bringing in video with embedded audio, and a 3.5mm line input offers analog stereo connectivity. A 3.5mm analog stereo output allows you to monitor sound via optional headphones. The monitor comes with its own power cord.
 
The OBM-U248K offers professional performance and features, including high-quality black level reproduction and accurate calibrated colorimetry, as well as integrated 3D LUTs, Waveform, Vectorscope, and a full broadcast feature set. Wide color space support includes DCI-P3 and ITU-R BT.2020 and is controlled with an advanced 3D LUT to reproduce various color spaces accurately with smooth, artifact-free grayscale steps. Available color gamuts are DCI-P3, ITU-R BT.2020, ITU-R BT.709, SMPTE-C, EBU, and Native.
 
Custom 3D LUT File Import
The OBM-U248K allows you to import 3D LUTs for accurate and consistent color matching between individual displays as well as using customized looks that have been created by third party color-grading applications. LUTs that can be loaded include: Log-C, C-Log, S-Log2, S-Log3, and J-Log1. LUT-converted content can then be output to downstream devices/monitors via the SDI loop out.
 
High Dynamic Range Display Function
The OBM-U248K allows you to display HDR footage with the option to view both highlights and shadow details of your scene at the same time, thus resulting in more natural and realistic images. It supports PQ EOTF (SMPTE ST 2084), Hybrid Log Gamma and S-Log3, and HDR and SDR (standard dynamic range) images may be simultaneously displayed.
 
Features at a Glance
Focus Assist controls the aperture level of a video signal and displays images on screen with sharpened edges to help camera focus operation.
 
False Color indicates the luma (Y) level of the input image. If a certain Y level is set, the pixels with the designated Y level are displayed with a zebra pattern or a color pattern. There are multiple display modes: Zebra, Variable, ARRI, and Comparison.
 
Gamut Error Type can be observed in 3 modes.
 
In Type 1, when the targeted color space is selected as BT.709, the pixels outside of the targeted color space are displayed as Black Zebra. The pixels over Y Maximum, Chroma Maximum, RGB Maximum are displayed as Black Zebra, and the pixels below Y Minimum, Chroma Minimum, RGB Minimum are also displayed as Black Zebra.
 
In Type 2, when the targeted color space is selected as BT.709, the pixels outside of the targeted color space are displayed as Black or White Zebra. The pixels over Y Maximum, Chroma Maximum, RGB Maximum are displayed as Black Zebra, and the pixels below Y Minimum, Chroma Minimum, RGB Minimum are displayed as White Zebra.
 
In Type 3: Mono, when the targeted color space is selected as BT.709, the pixels inside of the targeted color space are displayed as Mono, and the pixels outside of the targeted color space are displayed as the color. In this type, black and white area is not recognized.
 
Black Stretch increases visibility in dark areas without degradation of image quality in bright areas. This mode can be used to increase shadow detail without changing absolute black level and without affecting mid-tones.
 
4K HDR Waveform Monitor and Vector Scope Display modes enable users to monitor sources using the internal Waveform and Vector Scope individually or simultaneously. The position of Waveform and Vector Scope can be moved between Top Left, Top Right, Bottom Right, and Bottom Left.
 
Adjustable Gamma control allows for incremental compensation between gamma correction values of 1.0 and 3.0—thereby ensuring that the decoded image isn't too bright (no gamma correction) or too dark (overcorrection).
 
The LCD panel resolution is QFHD (16:9) 3840x2160, so if the input signal is UHD 4K (3840 x 2160), 1:1 mapping is supported. If the input signal is DCI 4K (4096 x 2160), 1:1 mapping is not supported. When 1:1 scan mode is selected with the button in 1920 x 1080 or 1280 x 720 mode, the image is placed in the center of the screen and a 1:1 mapped image is output.
 
Various frame markers and mattes are available, including aspect, area, and center markers. In addition, the detailed display settings of each marker are allowed. For example, the color, brightness, horizontal/vertical position, and thickness of aspect markers can all be adjusted.
 
Input Signal Format Support
Single-Link 12G/6G/3G/HD-SDI, Dual-Link 6G/3G-SDI, and Quad-Link 12G/6G/3G/HD-SDI signals can be input to the SDI In connectors. Up to 4-channel Single-Link 12G/6G/3G/HD-SDI signals, 1-channel Dual-Link 6G/3G-SDI, or 1-channel Quad-Link 12G/6G/3G-SDI signals can be input. Each link contains a full image at 1/4 resolution. 2SI mode uses four sub-images and alternates the samples every two pixels and every line instead of splitting the image into four quadrants.
 
12G-SDI (ST 2022-6) over IP is supported via an optional SFP interface, which allows the use of various SFP modules. 12G-SDI may be displayed over fiber and the 12G-SDI Single-Link over IP through the integrated SFP interface.