Digital Imaging Week 6
Digital Imaging
I have been asked to create a production file on Digital Imaging this includes: Raster graphics and Vector graphics, Optimum Resolution for both Print and Web, CYMK and RGB, Popular File Formats and a recap of the quiz I completed. I have now been asked to create a poster in Photoshop and Illustrator and will first create layouts for my posters.
Raster Graphics and Vector Graphics
Raster
graphics is associated with Adobe Photoshop images in Photoshop are made
out of pixels (tiny small squares), these pixels are either Red, Green or Blue
also known as RGB this means that each pixels is either one of those pixels at
a certain shade so a very light blue would be a white same with all the colours
depending on the shade. With a pixel image in Photoshop the image easily gets
distorted and pixilated or poor quality looking if the image size is increased
as the individual pixels start to become more visible.
Vector graphics is associated with Adobe Illustrator
and the images in it are made of shapes not pixels this means that when the
image size is increased (zoomed in) the image does not become distorted or
pixilated at all as the image is being re-drawn every time the image size
increased this makes it strong with programs like video games, as they use lots
of uses of zooming in images this helps to maintain the quality of the game,
the only down-side of Vector graphs are that they are very poor at displaying
continuous shades and tones unlike raster graphs which are fairly good at it.
The characteristics of raster graphics are that in
images it uses pixels in its images this means that it uses an RGB format in
its colour this means that each pixel is either Red, Green or Blue. Zooming in
on the image, the pixels become more visible the more the image size is
increased meaning it becomes more distorted and broken up. Raster graphs are
also good at displaying continuous shades and tones in images.
The characteristics of vector graphics are that
instead of using pixels like raster graphs it uses geometric shapes and flat
colours this means that when you zoom in on the image or increase its size it
does not break up or distort this makes it greats for video games also the
images re-draw itself whenever it is increased or zoomed in.
The main common application for Raster graphics is
“Adobe Photoshop”. Some more uncommon applications are “Microsoft Paint”
although this is not very popular as it is a more amateur software, “GIMP (GNU
Image Manipulation Program), Pixel Style Photo editor and a few more “Paint”
programs.
The main common application for Vector graphics is
“Adobe Illustrator”. Some more uncommon programs are “Ink Scape” for Mac OS and
“Concept DrawPro” for Windows.
Optimum Resolution for Print and Web
This is the maximum resolution that you can make
an image so that still looks as sharp but is not too big so that it slows down
any systems for example printing.
The optimum resolution for web is 72 pixels per inch this is best as it is at a high resolution still and appears sharp and still has a small size so that it does not slow down any systems. An example of this is an image that is 138.29x77.75 cm and at 72 pixels per inch is 24.7 megabytes.
CMYK and RGB Colourspace
Colour Space is the range of colours that a certain format displays for example for the web, it would display RGB (Red, Green and Blue).With CMYK the colours used are Cyan, Magenta, Yellow and Black these are the colours used to print images. The print would be done several times one in each colour, these colours can appear washed out or dull however due to the colours used.
The colours used on the web are RGB this is Red, Green and Blue that is used for images on websites these are dots of each colour to create continuous tones and can work well with high contrasting colours. RGB has a much wider range of colours than what CMYK has, as CMYK conversion reduces the data in any original RGB image, when data is lost during conversion it cannot be retrieved. As RGB does not require any conversion it does not lose any data.
Popular File Formats
JPEG – This file format is the most popular file format out
of the possible formats. This works well with displaying on both print and web,
this file format works well all round, giving reliable quality but still
compresses down to a small size. An advantage of this format is that it offers
different quality types when you save the image. The only problem with this
format is that it can sometimes compress to much meaning it will not open up.
GIF – This stands for Graphic Interlace Format this is suited
to web use only, not print. This format allows you to cut out the background of
an image (using the transparency option), this enables you to save it as a GIF
and save it as just an image shape, this is good with computer graphics,
animation and games however it is not good with working in print work as it is
not strong at working with deep tones, colours and detail and is only suited to
web work.
EPS – This is a Photoshop format and is one of the older
formats used and stands for Encapsulated Postscript, this enables you to save it as a
much smaller file and then when it needs opening, you can open it back up in
Photoshop and it will expand it back to its original size without actually
losing any quality whilst working on it. This is good to use when saving work
that still needs finishing however you would really save this as a format for
the final product as you are restricted in what you can open it with (Microsoft
software will not open this format).
PSD – This is the default format that Photoshop saves work
in, this is similar to EPS in the way that it saves your work to be able to
only open it in Adobe software that is compatible so like EPS it will not open
in Microsoft software such as word, however unlike EPS this does not take down
the size of the file when you save it, it remains the same size taking up more
space however this is the best quality format to use whilst working in
Photoshop, this can save all your edit history unlike other formats. You would
not use this format for creating images for the web or print you would work in
this format until the final product is completed and then save it in another
format such as JPEG.
PNG – This stands for Portable Network Graphic and is a new
format. This also is strong at compressing files similar to JPEG (saves large
files and compresses it to a small file). But this can also save without a
transparent background similar to GIF so this has the option to not save a
rectangular background unlike PSD and JPEG. This format is best for web images
and not print.
Recap Quiz
1. Vector Graphics are made up of shapes.
2. A computer programme can redraw shapes and polygons very quickly, vector based graphics can be zoomed in and will made to move.
3. Raster Graphics can handle text very well, but break up easily when zoomed in. The ideal resolution for an image is know as Optimum Resolution.
4. For Screen Based Graphics, this is 72 dots per inch. This is because It most closely matches the number of dots on a screen monitor.
5. The ideal resolution for a printed graphic is 300 pixels per inch. This is because it is the best balance between file size and quality.
6. The use of colour as set up in digital imaging programme is known as Colourspace.
7. The use of colour for images seen on screen is based around the three basic primaries of white light and known as RGB colour mode. This stands for Red Green Blue.
8. The colour space for images designed for print is based around the four basic primary colours of printing ink and is known as CMYK colour mode. This stands for Cyan Magenta Yellow Black.
Photoshop Layout
Illustrator Layout
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