unit 78 technical file

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  • 1. Unit 78 Technical File By Chris Munro

2. Pixel and Resolution Pixel Resolution is the pixel count in anydigital image. Pixel Resolution is describedwith 2 sets of numbers the first number isthe pixel columns and the second is thepixel rows (7680 by 4320) 3. Vector and Raster images There are two types of graphic vector andraster when it comes to computer graphics. Raster images are called Bitmap Images Bitmap images use a grid of individual pixelsand each pixel can be a different colour. Vector images use mathematic relationshipbetween points and the paths. 4. File formats and uses JPG Used for websites and emails as the file can be compressed making a small file size. But the smaller the file sizethe lower the quality, the bigger the file size the higher the quality. PNG was created for developers, as they needed high quality, low resolution images that load quickly and lookgreat. PNG are lossless, so they wont lose quality during editing. They are larger files than Jpeg. PNG also doesnot support animation. GIFs - are used in web graphics and they are lossless so the dont lose quality when compressed. GIFs can beanimated, and the pixels can be transparent to blend in with backgrounds. However the pixels must be fullyopaque or fully transparent. PDF will keep all fonts, colours, graphics and formatting of any source document. Adobe created PDFs so thismeans they can be shared, navigated, viewed and printed by anyone using free Adobe Acrobat Readersoftware. BMP Bitmap to save files it uses a Raster Graphic. At first it was only available for windows but is now recognisedacross all platforms such as Mac. BMP store colour data for each pixel for allows for high quality, crisp graphics.But creates a large file size.BMP is best used for printable images. TIFF Is the leading commercial and professional standard. It supports a wide range of colour spaces such as RGB,CMYK, YCbCr, etc. Tiff files are mostly used by photographers bot amateur and professional. PSD is a Photoshop file format. It allows us to edit in Photoshop as its a working file. Photoshop will open anyimage file and temporary convert it into a PSD. EPS Special software is required for EPS files as its a vector file requiring PostScript to draw the image. EPS hashigh resolution image data AI is a Adobe Illustrator File, which deals with vectors. Commonly used for Print media and logos. 5. Compression There are two types of image compressionLossless and Lossy Lossless can compress the file to an exactduplicate of the original but thecompression ratio is not high at all Lossy gives you a higher compression ratio asits strips the file of some of it redundantdata 6. Optimising Optimising digital graphics means taking animage file and reducing the file size. By reducing the file size of the image it can thenbe downloaded by a webpage faster thusenhancing the users experience. How it works is by reducing visual informationso this will effect the image quality as itdecreases the number of colours and/ortones. 7. Storage and Asset Management Storage and Asset Management can be simple and easy if done right. The digital world has many of storage devices with a lot of storage space to hold your digital files. such as hard drives, usb drives, memory cards and now even Cloud storage. The way you manage your digital files is down to you. Many would recommend using appropriate file names and types and saving them within folders to create a library. And creating regular back ups or copies and saving the to an alternate storage device. A good security system would help using passwords to gain access etc. There is even software you can buy to help you for example http://www.metacommunications.com/products/digital_storage_man ager/ 8. Sources http://www.fileinfo.com/extension/gif http://www.atalasoft.com/png http://en.wikipedia.org/wiki/Display_resolution http://www.alliancegroup.co.uk/pdf.htm http://www.techterms.com/definition/bmp http://www.scantips.com/basics9t.html http://www.photoshopessentials.com/essentials/file-formats/