PC Representation - From Megabytes To Unobtrusive Bytes.


128 views
Uploaded on:
Category: Fashion / Beauty
Description
PC Design - From Megabytes To Unassuming Bytes. By Murray Niman G6JYB. The Issue. SIZE MATTERS ! How is it I can download a website page, for example, BBC News which might have 40 Pictures in almost no time?
Transcripts
Slide 1

PC Graphics - From Megabytes To Modest Bytes By Murray Niman G6JYB

Slide 2

The Problem SIZE MATTERS ! How is it I can download a site page, for example, BBC News which may have 40 Images in almost no time? In any case, my mates send me Megabyte photographs which take ages to load and expense a fortune on the telephone bill (or inkjet cartridges) OR I must have the most recent 6-Megapixel camera - and I get the same issue

Slide 3

Common Formats BMP - Bit Map (1, 16, 256,32K or 16M Colors, no pressure) GIF - Graphics Interchange Format (Compuserve) (1, 16, 256) JPG/JPEG - Joint Photographic Experts Group (16m just) TIF - Tagged Image Format (Usually 16m) Also bunches of others:- PNG - Portable Network Graphics, PCX, WMF, PBM, EPS and so forth and so forth Most of the ones we are worried with are crude pixel information. Try not to mistake for WMF, PDF, Flash, brilliant shapes, Wordart and so on

Slide 4

Other Formats Powerpoint - joins any Pictures with content and representation Shockwave (SWF) & Flash - Vectored activity Movies:- AVI Microsoft Video (yet can be compacted into WMV, DivX) MPG - Motion Picture Experts Group MOV - Apple Quicktime Movie GIF - Animated - Very wasteful yet alright for website pages.:

Slide 5

Colors A Pixel = A Picture Cell - one dab that is a shading Everything is parallel: 1 bit = 0 or 1 = Black or White 16 hues = 4bits or a large portion of a byte One Byte 2^8 = 256 hues = a touch low for Color photographs Three Bytes = 24 bits, 2^24 = 16million hues (256 Red, Blue and Green) Note - a dark/white photograph is dim (RGB are all the same) Color uses RGB so needs upto three bytes rather than one

Slide 6

Pixels Pages and Sizes DPI - Dots per Inch (or pixels per inch ) An A4 page is ~12x8” dpi Pixels Total Pixels 75 900x600 540,000 100 1200x800 960,000 150 1800x1200 2,160,000 200 2400x1600 3,840,000 300 3600x2400 8,640,000 600 7200x4800 34,560,000 1200 14400x9600 138,240,000 2400 28800x19200 552,960,000 -and recall is frequently 3bytes for every pixel for full shading

Slide 7

Cameras, Scanners, Screens & Printers They are all diverse ! Screens are 75-90dpi Printers are 300-2400 Cameras/Scanners can zoom (Optical Zoom spares megapixels) You can\'t get a 1:1 size from Scanner to Screen to Printer If you know its last utilize, pick the size ahead of time

Slide 8

Size & Area This can give Big Gains . . . A photo that is a large portion of the size is a zone\'s quarter/no of pixels Crop superfluous things around the fringes Resizing the rest of by 30 or half Line Graphics: If a picture is a chart, circuit outline, map and so on it will just need somewhere around 2 and 256 hues - Using GIF is exceptionally financial and preferable quality over Jpeg High JPEG Compression doesn’t spare much however can demolish photographs

Slide 9

Noise Need great quality firsts: Clean high complexity pictures use far less space than loud/occupied ones (Lots of pixels can be tied up on grass cutting edges, leaves and so on) Raising difference and diminishing/consolidating hues can spare a considerable measure Flooding a somewhat uproarious foundation with dark or white and so on can spare a ton If it is practically dim, then make it a greyscale and lessen to 16 hues

Slide 10

How Many Colors? Charts/graphs might just need 16 hues A photograph may utilize 16million! (in any case, once in a while needs every one of them) A photo that is a large portion of the size is a range\'s quarter/no of pixels Many pictures on the web are lessened to 256 or less So not just does size make a difference, shading tally does as well

Slide 11

Example JPG: 56418 BMP: 751470 TIF: 750666 GIF(256): 103552 GIF(16): 33770 GIF(16) as JPG: 73647! 3200 Colors being used in Original 16 Colors being used in GIF(16)

Slide 12

Conclusions Formats Use the most proper for both quality and effectiveness JPG for most Photos, GIF for Graphs, Circuit Diagrams and so on Use a better than average PhotoEditor like Paintshop Pro and so forth - not the freebies with scanners/cameras - they give you control over hues, pixels and so forth Sizes/Pixels, No of hues - Do you truly require it all? Resize, crop. Keep a pleasant unique, however utilize/send just lessened renditions

Slide 13

.:tslid

Recommended
View more...