This article will cover the steps required to get Kali up and running in Oracle VirtualBox so you can try out the operating system and learn about ethical hacking. VirtualBox Browse to the VirtualBox downloads page and select the appropriate download for your operating system. Also from this page, download the VirtualBox Continue Reading
Learning
Learning and development resources and notes.
Installing Kali 2021 in VirtualBox
In this article, we will cover installing and configuring Oracle VirtualBox, creating a Kali Linux VM (Virtual Machine) and making sure the OS is up to date. Note: A revised artivle covering the installation of Kali 2025.2 is available. VirtualBox Browse to the VirtualBox downloads page and select the appropriate download for Continue Reading
Removing objects
This is a useful feature of Photoshop. There are two phases in removing an object from an image: The removal of the object Filling the area left by the removed object 1 – The removal of the object Selecting the Rectangular Marquee tool. Creating a marquee (click and drag action) around Continue Reading
Black and white conversion
Black and white conversion may be required when producing black & white printed material or to provide an ageing effect. Choosing the Image -> Duplicate menu item. Using the Duplicate Image dialog box. Entering a name for the duplicate image to be created. Using the duplicate image we are ready Continue Reading
Image Cropping
Using the crop tool it is possible to remove excess pace from the image. Selecting the Crop tool. Highlighting (click and drag motion) the portion of the photograph that we wish to keep. Adjusting the edges of the highlighted area (click and drag motion on the top, bottom, right and Continue Reading
Evolution of Adobe Photoshop
Adobe Photoshop reached version 8 in 2003. Then packaged with other apps in Adobe Creative Suite (CS). CS6 is 13th full release. Some new features added when rebranding from Photoshop to CS include: smart guides lens blur filter match colour command Macrovision copy protection (based on DRM technology) scripting support Continue Reading
Layers
Can hold separate elements forming a collage or separating elements of single image for manipulation. Layer visibility can be turned on and off. Layer opacity can be changed from 0% (transparent) to 100% (opaque).
Modes and Colours
Can use Photoshop to change mode of image i.e. how each pixel is represented. Predominant mode is RGB. Pixels represented by varying degree of intensity of red, green & blue. Performed via Image -> Mode.
Resampling
Changing physical size of image may require changing size or resolution. Resolution – number of pixels per inch square. If resolution of image does not match resolution of device displaying it, image resolution must change. If image does not fit destination space in current resolution then image needs to be Continue Reading
Introduction
Photoshop is the leading app for image editing, not easy to use though. Key tasks include: Removing a colour cast (i.e. the unnatural predominance of a single colour). Removing unwanted background objects. Superimposing text on a picture. Giving a 3-D bevelled appearance to text objects. Creating a collage from a Continue Reading