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Colour is a sensation and as such it is a subjective and incommunicable quantity. Colour measurement is possible because we can create a correspondence between colour sensations and the light radiations that stimulate them. This correspondence concerns the physics of light radiation, the physiology of the visual process and the psychology of vision.Historically, in parallel to standard colorimetry, systems for colour ordering have been developed that allow colour specifications in a very practical and concrete way, based on the direct vision of material colour samples arranged in colour atlases. Colour-ordering systems are sources of knowledge of colour vision, which integrate standard colorimetry.Standard Colorimetry: Definitions, Algorithms and Software:* Describes physiology and psychophysics useful to understand colorimetry* Considers all the photometric and colorimetric systems standardized by CIE (XYZ, CIELAB, CIELUV, LMS)* Presents colorimetric instrumentation in order to guide the reader toward colorimetric practice* Discusses colorimetric computation to understand the meaning of numerical colour specification* Considers colorimetry in colour syntheses and in imaging colour reproduction* Includes ready-to-use, freely-available software, "Colorimetric eXercise", which has multiple toolboxes dedicated to* displaying CIE systems, atlases, any colour and its whole numerical specification* colour-vision phenomena and testsStandard Colorimetry: Definitions, Algorithms and Software is an accessible and valuable resource for students, lecturers, researchers and laboratory technicians in colour science and image technology.Follow this link to download the free software "Colorimetric eXercise": Standard Colorimetry: Definitions, Algorithms and Software is published in partnership with the Society of Dyers and Colourists (SDC). Find out more at www.wiley.com/go/sdc
Mathew Schwartz reported for: If you want to break into a house, why spend time prying open the front door if the back door is wide open? Same goes when breaking into computer networks. Most networks and servers are set up with configuration errors that are well known to hackers, who can download free tools that will scan many different networks looking for those easy-open entry points. No genius-level code manipulation or high IQ is needed.
It also helps to know the anatomy of an attack. Many hackers follow similar patterns: running an automated script that scans networks, breaks into systems, downloads tools and then notifies the hacker that a compromised system is ready for use. The downloaded tool kit gives hackers instant access to the compromised system and the ability to rewrite the kernel or use it for anything from launching denial-of-service attacks on other sites to compromising private company data. 2b1af7f3a8