Unit 78 technical file
- 1. Unit 78 Technical File By Chris Munro
- 2. Pixel and Resolution • Pixel Resolution is the pixel count in any digital image. Pixel Resolution is described with 2 sets of numbers the first number is the pixel columns and the second is the pixel rows (7680 by 4320)
- 3. Vector and Raster images • There are two types of graphic vector and raster when it comes to computer graphics. • Raster images are called Bitmap Images • Bitmap images use a grid of individual pixels and each pixel can be a different colour. • Vector images use mathematic relationship between 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 size the 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 look great. PNG are lossless, so they wont lose quality during editing. They are larger files than Jpeg. PNG also does not support animation. • GIF’s - are used in web graphics and they are lossless so the don’t lose quality when compressed. GIF’s can be animated, and the pixels can be transparent to blend in with backgrounds. However the pixels must be fully opaque or fully transparent. • PDF – will keep all fonts, colours, graphics and formatting of any source document. Adobe created PDF’s so this means they can be shared, navigated, viewed and printed by anyone using free Adobe Acrobat Reader™ software. • BMP – ‘Bitmap’ to save files it uses a ‘Raster Graphic’. At first it was only available for windows but is now recognised across 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 it’s a ‘working file’. Photoshop will open any image file and temporary convert it into a PSD. • EPS – Special software is required for EPS files as it’s a vector file requiring PostScript to draw the image. EPS has high 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 compression Lossless and Lossy • Lossless can compress the file to an exact duplicate of the original but the compression ratio is not high at all • Lossy gives you a higher compression ratio as its strips the file of some of it redundant data
- 6. Optimising • Optimising digital graphics means taking an image file and reducing the file size. • By reducing the file size of the image it can then be downloaded by a webpage faster thus enhancing the users experience. • How it works is by reducing visual information so this will effect the image quality as it decreases the number of colours and/or tones.
- 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/ • •