I'm using Linux more and have landed on i3 as my preferred WM. Due to low vision, I use the Windows and iOS magnifier programs throughout the day. For Windows, it allows Ctrl + mouse wheel to change the zoom level, with the mouse cursor staying in the center of the screen to move around. I've seen this in Ubuntu previously with compiz. Macs also do this exceptionally well, but that is not my way.

The two main computer accessibility tools are screen magnifiers and screen readers. If you have little to no usable vision you will be best served with screen reading software, which reads aloud all of the text and text-based elements displayed on a computer screen. If you have some usable sight, you might find screen magnification software, which enlarges the information displayed on a computer screen, helpful on its own or used in concert with a screen reader.


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Built-in versions of screen readers and screen magnifiers are included on both OS X and Windows 7 and 8.1 computers. In addition, there are both free and paid options available that we will discuss later in this guide. First, let's take an introductory look at how these programs help users with visual impairments use a computer.

The most basic task of screen magnification software is to magnify the screen. Some screen magnifiers enlarge text, icons, and other graphics up to 20 times or more. If you are typing an e-mail while using a screen magnifier, for example, the program will enlarge the words you type to make them easier to read. As you type characters, issue keyboard commands, or move your mouse, a magnified screen view will keep up with what you are doing and where you are focused on the screen.

Screen magnifiers can also enlarge and enhance mouse and text cursors to make them easier to see and track. Magnifiers can also sharpen edges, increase contrast, and change color combinations to make things easier to see.

Screen readers speak letters, words, numbers, punctuation, and elements aloud, sending the voice output to your computer speakers or connected headphones. Screen readers are the default computer access method for people who are unable to see the computer screen. Even users with partial sight will want to learn about, and most likely use, screen readers. Perhaps right now you can operate a computer perfectly fine with just a bit of screen magnification, but what if your vision deteriorates? Even if your functional vision remains steady, pairing a screen reader with a screen magnifier will enable you to spend more time using your computer with minimal eye strain.

If you are learning to read and write braille, most screen readers offer an additional useful option. Instead of having your screen read out loud, you can obtain a refreshable braille display and use your screen reader without audible speech.

I'm trying to get an Ubuntu laptop functional for a visually impaired friend. Her impairment is such that a screen magnifier would solve the issue. I've tried out Kmag (as its the only hit when searching the software center for "magnifier"), but it seems odd the Ubuntu lacks a default. So I'm assuming I'm missing something obvious.

Canonical has abandoned visually impaired users and their actions are, to say the least, reprehensible and shameful. Every other OS creator provides quality full-screen zooming support for visually impaired users but since the advent of Unity, the actions of the devs of Ubuntu indicate that they no longer care about those users. I'll continue to use Ubuntu-based distros but Unity is now permanently on my "no-fly" list.

Literally every UNIX X11-enabled system typically has a set of tools, including a magnifier utility in question. Of course, nowadays most of them look quite old-school, but anyways they do what they were meant for. Here it is:

I wrote a how-to on installing gnome 3.10 on ubuntu on my blog which might be useful if you are interested in trying this out. GNOME Shell 3.10 magnifier has focus and caret tracking as well as mousetracking which I think is not offered by many.

More information about that is in another post about GNOME Shell's magnifier scaling which may be of use to you. It also explains how to scale the desktop view via gsettings without any magnifier at all.

Yes, as reported in a previous post, there is a specific problem with Ubuntu LTS 14.04 Trusty 64 bit (no problem with older 64 bit versions of Ubuntu, neither with 32 bit versions). If you dont feel like compiling the source of VMG, you may manually install the contents of the i586.rpm of the 3.2.1-1 version. The application executable file was "magnifier" instead of "vmg", and it works under Trusty 64 bit. Compared with the latest versions of VMG, you will lose direct control of zoom factor by mouse wheel in the magnified window, that's all, and this older version of VMG is still the best inmho.

The screenshot below shows how only part of a popup is visible when the user hovers over an info icon with a screen magnifier. However, when the mouse pointer is moved over to the popup it closes. So there is no way for the user to read it.

Color contrasts need to be good for people with low vision, and many design teams know how to check contrasts. However, most forget to check their contrasts on hover. This can create a big problem for users with screen magnification, who may have no choice but to hover over what they want to read.

Most people could just move the mouse pointer to another place and read the text. But a person using screen magnification will probably have no choice but to hover over the area to read it, since they need the text to cover all the screen for it to be readable.

For people who have impaired vision but still have some sight, a screen magnifier can help them to access and interact with digital content such as websites or documents. Screen magnification works by zooming in on the whole screen or sections of a screen as if you are looking through a magnifying glass. Some magnification packages can enlarge the screen by up to 64 times. There is inbuilt software which can magnify the screen for most users, but if you do need additional functionality you will need to consider paid for screen magnification software. Some of this can be very expensive.

SuperNova is designed for people with some sight. The program enables you to choose between magnifying the whole screen or by splitting the screen, so one part is zoomed-in and the other remains at the original size, as this can be easier to navigate around the screen.

Zoom Text also includes a feature that enables you to connect a camera (such as a webcam) to your computer, you will be able to magnify text on a paper document and use your computer screen and Zoom Text software to zoom in to the printed text.

There are different versions of both Zoom Text and SuperNova. The entry-level (basic) versions will magnify text and the more advanced (and expensive) versions include features such as reading out the contents of the screen.

Having a good-quality monitor or display will often make a huge difference in how clear the screen is and will minimise the amount of blur when you zoom in. Be aware that your choice of magnification software will depend on:

Screen magnification software allows users with low vision to read what is on the computer screen by enlarging and enhancing the text. The software often has some basic screen-reading functions as well.

Because I have poor eyesight I quickly noticed that some darktable YouTube videos appear to have a screen magnifier effect that is especially valuable when it is applied to the modules panel in darkroom. I would like to understand how this is implemented:

On my Linux Mint install that effect is not achieved by the application of desktop zoom in the visual tab of the accessibility option within system setting. That function enlarges an area of the screen uniformly. What I am seeing, on certain YouTube videos, is as if the modules panel alone has become a separate window which is enlarged so that it appears to overlap the centre image display area.

SuperNova is a range of assistive technology for people who are blind or partially sighted. You can rely on SuperNova to provide exceptional magnification, screen reading and braille support. It enables you to explore your computer screen and read on-screen information independently.

Simply plug the SuperNova USB into a Windows laptop, PC or tablet to access SuperNova screen magnification, speech and braille support. Your preferred settings and customised views are saved and ready to go.

Screen readers are great at providing information about which screen is open, whether a link has already been clicked, and whether the text is underlined or bolded. Users with low vision or limited hearing can find them especially useful, as the text on their computer screen can also be converted into Braille characters.

As we said above, screen magnification is an excellent technology for enlarging areas of your display. Aside from that, it can also emphasize specific areas on your screen with color contrast and shading. This is especially useful if you have trouble reading some text or easily get lost around the screen.

Screen magnification software allows you to customize your mouse pointer (cursor) by circling it, for example. This helps you locate it easily on your screen. Similarly, it offers you the option of smoothing the edges of text that is hard to read or inverting your screen colors from black-on-white to white-on-black.

You can choose different screen magnification modes. For instance, you can use the software as a magnifying glass for the entire screen or a fixed position where you usually scroll. Also, you can use the standard magnifying lens that magnifies around your cursor and zooms in on different parts of the computer screen.

The ideal target audience for a screen magnifier is people who have impaired vision but still have some sight. For them, screen magnifiers work well in the way they help them access and interact with digital or web page content. 2351a5e196

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