I used an X-Rite Eye One Display 2 Colorimeter and BasICColor/HCFR/Eye One Match 3 to measure the colour presets and for calibration, as well as PixerPixAn for motion testing.
HP 2509b Review
Dirt 2 PC Maxed Settings
Video Overdrive Off
Digital Versus Ghosting Test
Video Overdrive On
Digital Versus Ghosting Test
Turning on VO is not recommended. Major dark streaking/smearing can be seen with camera pans which is very distracting.
VS CRT PixerPixAN
VS LG W2442PA/Acer G245H/BenQ EW2420/Samsung 275t PixerPixAn
VS Samsung S27A550H PixerPixAn
The LG W2442PA remains king in terms of responsiveness with the Samsung PX2370 in very close 2nd. The Acer G245H/Samsung S27A550H and HP 2509b all show similar ghosting characteristics. I have not used the 2509p enough yet to be able to give proper insight as to how much it ghosts and if it streaks/smears/shows the "corona effect," (shield forming around fast moving objects).
Response Time 4/5
Default Color Presets Chart
The 6500k and Text presets both offer very good color accuracy. Color temperature is slightly to warm in both of these modes, however the gamma is very good resulting in good shadow details and punchy colors. Setting the HP 2509b to the Text preset and turning down the brightness resulted in a very accurate picture for gaming/movies, good shadow detail, and deep blacks. The glossy coating helps make colors like vibrant and clear...at the price of relfections
For a cheap TN panel the HP 2509B marvels in terms of default color accuracy. The LG W2442PA I tested had the edge here in "User," mode which is tied with the Samsung PX2370 in terms of default color accuracy. However both the HP 2509b and LG W2442PA have better screen uniformity and black levels than the PX2370 I tested.
The HP 2509B has nvery good default color accuracy, the contrast ratio is outstanding at over 1100:1, which is the highest contrast ratio I have seen on a TN panel and the default average gamma was very good. Thep blacks, accurate color presets, proper shadow detail and color saturation combined with the glossy screen which adds extra color vibrancy and image clarity, all make the HP 2509B is a clear winner in terms of TN panel quality.
Default Color Presets 4.5/5
Long Exposure to reveal issues
Reference Samsung F2380MX C-PVA
The above picture magnifies the dis-uniformity due to the longer exposure. The first picture is a "real life," representation. The HP 2509b has very good backlight uniformity. The LG W2442PA is still king in terms of screen uniformity, with the Acer G245H second and the HP 2509b in third. The screen appears very uniform with a tiny bit of light leakage on the top and bottom. It is hardly noticeable during a widescreen movie in the dark, though the slight blue tint is a bit distracting on the bottom center in this picture I took of L4D2 with the lights out.
I measured the color temperature and brightness values across the entire screen
I calibrated the HP 2509b to 120cdm/2 and the color temperature to 6500k (center of the screen).
The left side of the screen measures around 90cdm/2 and gets brightter from left to right. Brightness and color temperature distribution are pretty good with no actual visible deviations in brightness. Typically 40%+ differences in brightness are quite visible. With even brightness, color temperature and little backlight bleeding the HP 2509b is a clear winner and a perfect successor to the Acer G245Hbmid which is no longer avaliable from most retailers.
Backlight Uniformity 4.5/5
I calibrated the HP 2509b using the X-Rite Eye One Display 2's bundled software Eye One Match 3 and verified the results with BasICColor and HCFR because Eye One Match 3 doesn't give in depth results.
I try to calibrate the monitor to around 120cdm/2 brightness which typically gives the best contrast/black depth result for light/dark viewing enviroments. The industry standard for displaying accurate "true to life," color is a temperature of 6500k and for the best shadow detail I try to achieve a gamma value of around 2.2. A low gamma value (2.05-) will result in a some what washed out picture while gamma values of 2.4+ crush dark details.
After calibration the image quality is further improved to near perfection, only the gamma was slightly off the target value of 2.2. The HP 2509b looks fantastic before and after calibration thanks to its deep black level, good screen uniformity and accurate colors. This is the 2nd best TN panel I have tested. The Acer G245H and LG W2442PA are tied for first, though their blacks aren't quite as deep they make up for it with slightly better screen uniformity and perfect gamma.
5 star ratings are resereved for IPS and VA panels with deep blacks and better color uniformity, still the HP 2509b easily earns itself a