F-STOP CORRECTION

Here is a simple way to adjust exposure in the f-stop increments that is second nature to photographers. The key to this technique is that the Screen and Multiply layer blending modes, at an opacity of 38%, produce an effect very similar to lightening or darkening by one full f-stop. (For half-stop adjustments, use 19% opacity, for one-third stop use 13%, and  so on.) In this example, we’ll darken the image by one stop.

DIGITAL LIGHT PAINTING

Digital light painting is a powerful Photoshop technique that can be used to turn lifeless images into works of art. In fact it is the digital equivalent of a photographic lighting technique called painting with light. Painting with light needs to be executed in relative darkness so that a small handheld light source can be used to paint light energy over a subject during a long exposure. This painterly lighting effect works well on subjects that are stationary but falls short on animated subjects such as people. Light painting people usually renders static looking results. Digital light painting has major advantages over painting with light. It is not a “blind one way” process—the painting effect is visible as you create it, you can modify it at any time, and you do not have to work in darkness. This technique works best with flat lighting so frontal lighting is most favorable—all highlight and shadow will be created in Adobe Photoshop.

CREATING THE MAGICAL MIRROR EFFECT

“It’s all done with mirrors” is a popular saying among professional magicians.

Well, these days, digital photography artists are using mirrors, of sorts, to create magical effects on their computer monitors. Basically, a mirror image is one in which one side of a frame is perfectly mirrored (reflected) on the opposite side of the frame—side to side or top to bottom. In Photoshop, we use Canvas Size, Copy and Paste to create the effect. It’s that easy!

CREATING METALLIC TYPE

The effect in this exercise is as widely used as the drop shadow. Metallic type can be found in car ads, CD covers, and movie logos. A glance through any magazine will produce a myriad of examples. There will be many intermediate steps to this exercise. Keep in mind that the end result is not really what is important here but rather the steps. These steps with a minor alteration—as the use of a different color—will provide the solution to many other situations.

HOW TO MAKE YOUR OWN CAT 5 TWISTED-PAIR NETWORK CABLES

INTRODUCTION. The purpose of this article is to show you how to make the two kinds of cables which can be used to network two or more computers together to form quick and simple home or small office local area networks (LANs). These instructions can also be used to make patch cables for networks with more complex infrastructure wiring.

INSTALLATION GUIDE FOR QUARTUS ON UBUNTU LINUX

Preface
This guide is for intended for those wishing to install Quartus, Modelsim and Megacore IP on an Ubuntu system and is based upon the Quartus for Ubuntu availiable at the Nios Wiki (http://nioswiki.jot.com/) which can be found here. It has been tested using Quartus 7.2, Modelsim 6.1g and Megacore IP 7.2 for Linux on an Ubuntu  7.10 system, which, at time of writing are the latest versions avaliable although it may work for other versions and even other Linux flavours.

SCRIPT TO CLEAN UP COREFILES

SCRIPT TO CLEAN UP COREFILES
Create a file called rmcores(the author calls it handle−cores) with the following in it:

#!/bin/sh
USAGE="$0 <directory> <message−file>"
if [ $# != 2 ] ; then
echo $USAGE
exit
fi