Nec PH1000U (7) Correcting Horizontal and Vertical Keystone Distortion CORNERSTONE. COCAR Mini Video Projector uses advanced technology using DLP projector technology, keystone correction, Bluetooth 4.0. With Mac and personal computers. Keystone Correction Automatic Vertical ± 30 degrees Keystone Correction Manual Horizontal ± 30 degrees Mac Connectivity Projector is Mac compatible via USB, DVI to HDMI or VGA adapter (not included) Contrast Ratio Units Per Master Carton: 10 Up to 2000:1 Color Reproduction 16.77 million colors Projection Lens Type Manual optical zoom/Manual focus.

As an instructor, you may need to present information in different classrooms and in different environments. No matter if your presentation will take place in a large classroom or a small classroom and whether you are using a screen, a blackboard, or an improvised wall, one of the challenges you will frequently come across is keystone.

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What is Keystone Correction?

Have you ever projected an image on the wall and noticed that the image is not rectangular? If so, you understand why keystone correction is necessary.

The reason why this happens is because the projector is not sitting perpendicular to the projection surface. Antares auto tune efx+ torrent free. As a projector is turned left, turned right, or tilted up or down, you will see that a trapezoidal image is projected. You are seeing keystoning.

This distorted image is what you as an educator want to avoid. The problem is that in some classrooms there is not the perfect place for you to put a projector. This is where keystone correction comes into play.

Vertical Lens Shift

This feature makes it possible to correct an image where the top and bottom of the image are different lengths. The vertical lens shift allows you to address this issue without needing to move the projector.

You are able to raise or lower the image, taking that trapezoid shape and returning it to a rectangle.

Horizontal Lens Shift

If the left and right sides of the image are different lengths, you can use the horizontal lens shift to correct the problem. Again, this feature allows you to move the image to the left or right, correcting the trapezoid shape without needing to physically move the projector.

There are two types of keystone correction available on most projectors. There is a manual correction and a digital one. The manual correction, as its name implies, is a physical adjustment that happens to the lens.

This correction makes it so that the projector points at an angle that is higher or lower than what it would normally point to if it was on a flat surface. Manual keystoning works great in the majority of circumstances.

The projector does need to be an appropriate distance away from the screen to achieve the desired results.

Digital Keystoning

LCD and DLP projectors are both designed to display digital information. Information that is sent to the projector digitally, such as in a PowerPoint presentation, can be digitally converted and scaled.

Some projectors have added a selected algorithm to the scaling, which allows it to alter the image before the image reaches the lens.

This means that the image will be square, even if the projector is at an angle. This offers more flexibility when setting up a projector, especially if the setup is in a unique environment.

Potential Downsides of Digital Keystoning

If a projector comes equipped with digital keystoning, why worry about manual keystoning? While digital keystoning can be effective in some circumstances, it may add a couple of unwanted changes to your image.

Projector Keystone Correction Software Mac

Depending on what you are projecting and the application you are using with the projector, this may or may not be an issue for you.

Digital keystoning will use digital scaling to shrink the long side of the image. When this happens, information is removed from the image.

This leads to scaling artifacts that become easier to see the larger the image is.

For example, if there is text in the area that is being scaled, that text will become fuzzy. This problem becomes less evident if you’re using video or photos.

A second challenge is that the image becomes dimmer. Some of the lumen output is removed because the scaled image is smaller than the native resolution of the projector.

This is why we say that if you are moving a projector from place to place, it’s better to use the manual keystone correction.

If you know in advance that you are going to be moving your projector around, then you may want to start by searching for projectors that have horizontal and vertical shift lenses.

Projector Keystone Correction Software Mac Os

This way, you know you will be able to adjust the projector to meet the needs of the environment that you are in.

You should also look at the amount of correction the projector can provide. For vertical keystone correction, some projectors will offer between 12 and 35 degrees of projection. Keystone correction is a great tool if you need to move your projector from classroom to classroom.

But, remember, it is going to impact picture quality. It can lead to a slightly distorted image, especially when it comes to the sides of the screen.

See related - best HD projectors and best 4K projectors

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A Handy Feature for Presenters

Road warriors have to present in unknown environments on a regular basis. Whether they are presenting to a small or large audience, in a room with a screen, or improvising with a wall, one of the most frequent and frustrating problems is keystoning.

What is Keystoning?

'Keystoning' occurs when a projector is aligned non-perpendicularly to a screen, or when the projection screen has an angled surface. The image that results from one of these misalignments will look trapezoidal rather than square. A distorted image is a distraction most presenters want to avoid. However, in some cases, there is nowhere else to place the projector. So what can you do?

Early projectors did not have keystone correction features. Projectors were usually found in fixed installations, so furniture and screens could typically be moved to accommodate. As projectors became lighter and more portable, the demand for an easier solution grew.

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Vertical Keystone Correction Projector

Manual Keystone Correction

Today, there are two methods of keystone correction, manual and digital. Manual keystone correction is essentially a physical adjustment to the lens of the projector so that it projects at an angle higher or lower than it would be if it were on a flat surface. The manual adjustment works well in some situations, but cannot eliminate horizontal keystoning. The projector also needs to be far away from the screen to achieve results. Not good enough you say? Read on..

Digital Keystone Correction

Projector Keystone Correction Software Mac Version

LCD and DLP™ projectors are both digital display devices. Data such as a PowerPoint presentation sent to a projector is digitally converted and scaled. By adding a special, selectable, algorithm to the scaling, some new projectors are able to alter the image before it reaches the projection lens. The result is a squared image, even at an angle. This allows presenters more flexibility when setting up their projector in variable environments.

Degree of Correction

Projectors vary in the amount of keystone correction they can provide. For vertical (up and down) keystone correction, some offer a modest 12 degrees while others achieve as much as 35 degrees of correction. Some new projectors, such as the latest line-up of Hitachi projectors, also offer horizontal (side to side) keystone correction.

While keystone correction is a handy feature for road warriors and other portable projector users, it does not produce an ideal picture quality. Scaling inside the projector creates a slightly distorted image, particularly at the sides of the screen. In a long-term installation, lens shift is preferred to keystone correction. Jailbreak ios 7 download for mac.