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Cognitive Technophysicist

The intersection of Cognitive Science, Psychophysics, and technology, broadly construed

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Showing posts from October, 2018

Weekly grocery specials for Clairemont Mesa Balboa/Genesee area

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October 15, 2018

Food 4 Less (4995 Shawline St)
Harvest international, on balboa ( 4220 Balboa Ave San Diego, CA 92117 )
Ranch 99 (good parking/limited selection or: amazing selection/horrid parking )
Balboa International market (5905 Balboa Ave)

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Alan Robinson, Cognitive Scientist

Technology enthusiast and visual neuroscientist.

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Panasonic TH-42PX75U Plasma TV review: input lag and upscaling tested using the piLagTesterPRO

This 720p Plasma TV from 2008 is very unique and quite nice in many ways. It used to retail for around $1300. If you can find one it's a great choice for retro gaming. Overview/Image quality This is a plasma TV, which generally means at least the following: nearly infinite viewing angles, and jaw dropping weight. That's true in this case as well. This 42" model weights 75lbs. At native resolution (720p) this TV crops 20 pixels off the top/bottom and 30 off the sides. 480p/i crops 20 pixels off all sides. Both modes have aliasing, too, though it's not too bad. There's really no excuse for aliasing on a TV this big: you know the panel was designed specifically to be a tv. Why not hit 720p exactly? And as for 480p/i, they could have at least offered a zoomed out mode with black borders and 1:1 pixel mapping. But no such luck. There are zoom/stretch options to crop even more, but none that crop less. While the native resolution supposedly is 1366 x 768 it does accept

piLagTester PRO order page

September 09, 2021

The piLagTesterPRO measures your monitor's input lag and response time. It is a cheap, full featured add-on to the Raspberry Pi; I provide the sensor and required software, you provide the Pi (a $5 pi Zero is more than sufficient). Although it has a DIY aesthetic, it is quite functional and in fact offers quite a lot more features than the commercial alternatives (Leo Bodnar and the Time Sleuth), and has been tested with over 40 TVs, including 4k models . Here's what it looks like in action: The pi draws a black background, and then roughly once a second displays a set of target rectangles (top/middle/bottom). You place the sensor over the desired target, and the piLagTester measures the monitor's response starting from the moment the frame of video data is sent over the Pi's HDMI port. This is plotted in the graph, which is sideways for space reasons. The lag tester measures two thresholds. In red it shows how long it takes for the monitor to start displaying t

Vizio VX20L HDTV review: input lag and upscaling tested using the piLagTesterPRO

This 720p TV from 2007 is rather mediocre, with variable input lag, aliasing, and in general very little to recommend it for gaming, retro or otherwise. Image quality Good upscaling is critical for retro gaming. Ideally, all pixels should appear equally sharp and bright (no aliasing), and angled lines should appear smooth, with no jagged, irregular steps. Also important is that the display shows most or all of the pixels it is sent. Often, this is not the case, with some number of pixels cropped from the bottom or top edges. Shockingly, these tests are relevant for modern gaming as well, because even at their native resolution many TVs have aliasing and cropping. The set has no options to adjust cropping/scaling. At least not without the remote. 480i/p is displayed stretched to 16:9. resolution aliasing cropping (top, side) 480p/i mild 20, 30 720p bad 30, 40 1080p mild 40, 60 Aliasing is quite bad at the tv's "native" resolution of 720p. 1080p actually looks better

How to pause animation in PowerPoint

October 29, 2009

If you have a long animation looping animation that you want to be able to pause and then resume, there's an easy way to do so with the keyboard. Press the 1 key, which puts you in the mode where you can type in a slide number to jump to. In this mode, all animation is paused. To get out of this mode without jumping to another slide press the ~ key. There are lots of keyboard shortcuts in Powerpoint; press F1 to get a list. Note that one of them is listed as "pause" (S key or + key) but this doesn't actually seem to work in all the situations that the trick described above does. Tested an known to work in PPT 2003.

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