During the calibration phase we were able to improve the color accuracy of the Toshiba 46XV454U, but not to as large of an extent as we would have liked. As we mentioned, the color management system was largely ineffective at bringing the set's primary and secondary colors closer to the HD standard. Yes, we could make some improvements, but at the expense of color decoding, which made the image appear unnatural. We had better luck with the green and blue drive controls' influence over the grayscale, improving it significantly over the Warm preset (see the Geek box for details). The grayscale was still minus-green overall, but much better than the bluish case it had before. After calibration we measured a solid 2.09 gamma. For our full picture settings, check out the bottom of this blog post.
For our main image quality tests we involved a few other similarly priced 120Hz LCDs, namely the Sony KDL-46W4100, the Samsung LN52A650, and the Sharp LC-46D85U, and used the Pioneer PRO-111FD, as always, as a reference. We watched Vantage Point in Blu-ray via the PlayStation 3.
Black level: The Toshiba did quite well in this department compared with the other displays in our comparison. It reproduced slightly deeper blacks than the Samsung and the Sharp and matched the Sony's depth of black in dark areas, like the letterbox bars, the shadows in the back of the Presidential limo, and the dark recesses of the TV control room. Shadow detail was also quite good, although not as natural-looking as the Samsung or our reference display. Dark areas like the black coat of Dennis Quaid in the control room, for example, appeared a bit more obscured, although still better than on the Sony and the Sharp.
Color accuracy: The 46XV545U earns mixed reviews on the color accuracy front. For the most part, after calibration it looked about average, with fine saturation and punch on account of the deep black levels. Skin tones, especially in dimmer areas like the face of Enrique's girlfriend as they embrace before the speech, did appear slightly greenish/yellowish and pale compared with the reference, but not to any egregious extent. We attribute this problem to the Toshiba's highly inaccurate primary color of green, which was visible in the yellowish/greenish tinge of the plants along the freeway as Enrique escaped, for example. We also noticed the overly blue tinge of cyan in the stairwell of the hotel, as well as in the shirt of a hotel employee.
The somewhat less-accurate grayscale was visible in white areas too. For example, when the cloud of smoke from the explosion in the square billowed up toward the camera, it appeared a bit redder than on our reference display. We did appreciate the neutral color of black areas on the 46XV545U. Compared with the Samsung, with is slightly greenish blacks, and the Sony and Sharp, which lent black areas a bluish tinge, the Toshiba's black and very dark areas appeared the most accurate of the LCDs in our comparison.
Video processing: The Toshiba 46XV545U includes numerous video processing options, but we'll start as usual with a look at its 120Hz and dejudder modes. An option called ClearFrame in the menu engages the set's 120Hz processing, while dejudder is handled by Film Stabilization, which has two settings called Standard and Smooth.
Watching Vantage Point with resolutions other than 1080p/24 (see below), we found that Standard was pretty much indistinguishable from no dejudder at all. Smooth, on the other hand, did smooth images appreciably, removing most of the judder from film-based sources and providing that telltale "on-rails" look. As usual, with Film-based material, we preferred to leave dejudder turned off, although some viewers may like it.
Compared with the Sony and Samsung sets in their High dejudder modes, Smooth on the Toshiba did evince fewer artifacts during one of our favorite tests-- the difficult section at the beginning of Chapter 18 in SpiderMan 3, where the camera orbits Peter Parker during the parade. The Toshiba was less-smooth-looking than those displays, but it also showed no "halo" distortions around his head. During Vantage Point, it was again obvious that the Toshiba wasn't doing as much smoothing as the other two. As the camera follows the president down the handshake line, for example, motion seemed much more stable on those displays than on the Toshiba.
We also checked out one of our favorite scenes to evaluate dejudder, the flyover of the USS Intrepid from I Am Legend, first in normal 1080p/60 mode. In Standard Film Stabilization mode, the Toshiba looked much like it did with Off; judder was prevalent, and we couldn't see much difference between the Toshiba and the other LCDs with their dejudder modes turned off. We switched to Smooth on the Toshiba and the smoothing effect increased, as expected, although again it didn't look as steady as the High modes on the Sony or Samsung displays.
With 1080p/24 material, the Toshiba's Film Stabilization mode is best set to Standard to preserve the native cadence of Film. During the pan over the Intrepid, Standard evinced the steadier judder--which we consider the most natural, film-like look--seen on the other 120Hz displays with their dejudder modes turned off. Smooth introduced the same kind of overly aggressive smoothing, while turning Film Stabilization to the Off position brought back the subtle hitching motion associated with 3:2 pull-down processing. We'd expect film buffs watching 1080p/24 material to prefer the look of Standard.
Our resolution tests revealed that the Toshiba resolved every detail of 1080i and 1080p sources, correctly deinterlacing 1080i from both film and video, and delivering between 500 and 600 lines of motion resolution when we engaged the ClearFrame processing. We switched between the various Film Smooth settings and they didn't have much impact on motion resolution. Switching ClearFrame off caused the display to revert back to the standard LCD motion resolution of between 300 and 400 lines. But if you're keeping track, since ClearFrame doesn't itself introduce dejudder processing, the Toshiba is one of the few 120Hz LCDs to deliver improved motion resolution without having to also introduce dejudder. It's also worth noting that none of these resolution characteristics, motion or otherwise, were easily discernable in regular program material as opposed to test patterns.
The SRT Super Upconversion feature is designed to work with standard-definition material, so we'll direct you below for details. We were able to engage SRT with 720p material as well as 480i (and not 480p, 1080i or 1080p sources) but we only tested it with 480i.
Uniformity: During dark scenes, the Toshiba's screen evinced the worst uniformity in our test. When the all-black "23 minutes earlier" screen appeared, for example, brighter splotches were visible in the upper corners, as well as along the bottom edge toward the right side. The entire right side was a bit brighter than the rest. The brightness difference became essentially invisible during bright scenes, but in darker scenes we could make out the brighter corners in the letterbox bars, for example. When seen from off-angle the Toshiba lost black levels a bit faster than the Sony and about the same as the other displays, and we also noticed discoloration, where the image became more bluish-green the further we moved off-angle to either side.
Bright lighting: With the lights turned up, the matte-screened 46XV545U attenuated room lighting as well as any of the other matte-screened LCDs and better than the Samsung and the Pioneer, although it didn't preserve black levels as well as the Samsung.
Standard-definition: The Toshiba turned in a below-average standard-definition performance with SRT Super Upconversion turned off. The set resolved every line of the DVD format, but details, for example in the steps and stones of the bridge in HQV's detail test, appeared quite soft. The Toshiba failed to clean up the edges of moving diagonal lines and a waving American flag as well as we'd like to see, although it wasn't terrible. Noise reduction was solid, removing the motes and snowy noise from skies and sunsets quite well. The Toshiba successfully engaged 2:3 pull-down, eliminating the moire from the stands behind the speeding racecar.
SRT Super Upconversion is one of the main selling points of this TV, and when we switched it on, the differences were not subtle. The main effect of SRT that we could discern was to introduce edge enhancement, much like a TV's Sharpness control. There are three SRT modes in addition to an Auto setting, and Mode 1 introduced the least EE (aside from Off) and Mode 3 the most. The artificial edges can increase perceived sharpness, which can seem to make low-quality material look more detailed. In the Toshiba's case, compared with the Off setting, engaging SRT did improve the apparent detail of many areas, such as the bricks behind the waving American flag and the bridge in the Detail test. However, we believe that's mainly because of Off's general softness compared with the other displays in our lineup. For that reason, we'd recommend using the mildest of the three SRT settings with standard-definition material, despite the artificial-looking edges it can create, especially around text and other onscreen graphics.
It's worth noting that, as with all other standard-definition processing, SRT is irrelevant if you use an external source that does the conversion itself. Such sources can include upconverting DVD or Blu-ray players, a cable box, or a satellite boxes set to convert everything to HD.
PC: Via the digital HDMI input, the Toshiba performed as perfectly as we'd expect from any 1080p LCD, displaying every line of a 1,920x1,080-pixel resolution source with no overscan. Via an analog input, as the manual indicates, the highest resolution we could achieve was 1,280x1,024, although we preferred the look of the wide-screen 1,360x768 resolution. Either way, both were softer than full 1,920x1,080, naturally.
|Before color temp (20/80)||7738/7158||Poor|
|After color temp||7009/6446||Average|
|Before grayscale variation||659||Poor|
|After grayscale variation||237||Average|
|Color of red (x/y)||0.648/0.331||Good|
|Color of green||0.221/0.669||Poor|
|Color of blue||0.15/0.057||Good|
|Defeatable edge enhancement||Yes||Good|
|480i 2:3 pull-down, 24 fps||Pass||Good|
|1080i video resolution||Pass||Good|
|1080i film resolution||Pass||Good|
|Toshiba 46XV545U||Picture settings|
|Picture on (watts)||178.59||133.5||N/A|
|Picture on (watts/sq. inch)||0.2||0.15||N/A|
|Cost per year||$55.28||$41.32||N/A|
|Score (considering size)||Good|
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