A Handy Feature for Presenters

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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.

ตั้งค่า Video Projector. นอกจากตำแหน่งและมุมแล้วเครื่องฉายวิดีโอส่วนใหญ่ยังมีเครื่องมือเพิ่มเติมที่คุณสามารถใช้ประโยชน์จาก Keystone Correction และ Lens. Keystone correction (trapezoidal in nature) is used when projectors have been mounted at an angle (generally pointing down from a ceiling to a screen), and the opposing angular correction needs to be applied in order for the image to be correct. Whilst most current projectors offer this feature, in many areas, advanced functions are required.

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. Superfighters deluxe. 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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Manual Keystone Correction

Projector Keystone Correction Software Mac

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

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.

Projector Keystone Correction

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.

Projector Keystone Correction Software Mac Free

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.