Lesson 4 - RW, Culture - ARTS AND CRAFTS - Page2

Z Studia Informatyczne
Przejdź do nawigacjiPrzejdź do wyszukiwania

Page1 Page2 Page3 Page4 Page5 Page6

Answer the questions.


Adobe Photoshop is an application for editing

bitmap images

vector images


Adobe Illustrator and Corel Draw are applications for editing

bitmap images

vector images


Of the two kinds of graphics, ........................ have usually a smaller size (take up less memory).

bitmap images

vector images


Read this excerpt from Grokking the GIMP, a manual for the GIMP, an open source raster graphics application, and answer the questions. You can view the entire manual at http://gimp-savvy.com/BOOK/


Which Format: GIF or JPEG?


There are two image file formats that can be interpreted by all major Web browsers: GIF and JPEG. The question is which one is better? The answer is: it depends. For Web-safe color, the answer is clear. Only GIF images can guarantee that almost every monitor will be able to display your image as you composed it on your own computer. This should be taken with a small grain of salt, because the color balance of every monitor is a little different. However, within limits, GIF can provide pretty uniform access to your Web images [...].


JPEG, on the other hand, is an image format that has two major features. The first is that it saves images in 24-bit color. For photographs, where there are typically subtle variations in color, 24 bits is required to get a high fidelity representation of the image. Of course, out on the Internet, only those who have high-color (16 or 24 bpp) systems can see the image as it was originally composed. The image is dithered for those with low-color (8 bpp) systems.


Alternatively, using only 8 bits of color for a photo is almost certainly insufficient to represent all its color variation. Thus, converting the image to GIF requires dithering anyway. The conclusion is that, for most images having a high degree of color variation, which includes most photographs of real world scenes, the use of JPEG is clearly preferable. It allows those with high-color systems to view the image as it was originally prepared; whereas the degradation in image quality for those with low color systems is similar whether the image is in GIF or JPEG format.


The second major feature of JPEG files is that they can provide a high degree of perceptually optimized image compression. This is useful especially for Web site designers concerned about the overall bandwidth required to view their site. JPEG image files can achieve much greater levels of compression than GIF files can. Furthermore, the degree to which an image is compressed using JPEG can be specified by the user. Thus, for any particular image, it is possible, by making several tries, to find just the right balance between minimizing the file size and maintaining the visual integrity of the image.


The conclusion is that for images with subtle variations, such as most photographs of real world scenes, use JPEG. For images that contain only a small number of colors, such as those created using the GIMP's painting or rendering tools, use a web-safe color palette and save as a GIF.



Which format is recommended for ensuring that the image will be displayed in the same way on all monitors?

JPEG

GIF

Which format is recommended for most photographs?

JPEG

GIF


Now read the text again. Which advantages of the JPEG format are mentioned in the text?


It saves images in 24-bit colour, which enables a high fidelity representation of the image.

True

False

In can provide a high degree of image compression.

True

False

The degree of compression can be specified by the user.

True

False


  • Ćwiczenie 6 aqm


Fill in the missing prepositions. If necessary, look at the text again.


Let’s convert the image .......... GIF.

by

in

of

on

to

This application saves images .............. 24-bit colour.

by

in

of

on

to

There are typically subtle variations ............. colour.

by

in

of

on

to

We need a greater level ............... compression.

by

in

of

on

to

We need a higher degree ................. compression.

by

in

of

on

to

Unfortunately, there’s nothing we can do about the degradation ............. image quality.

by

in

of

on

to

We saw the images ............. the Internet.

by

in

of

on

to

We need a high fidelity representation ............. the image.

by

in

of

on

to

This is insufficient ............... represent all the colour variation of the image.

by

in

of

on

to

The degree of compression can be specified .................. the user.

by

in

of

on

to

WRITING

When you visit the web page of the British Museum, you can take one of many virtual tours of the Museum. Go to

http://www.thebritishmuseum.ac.uk/compass/ixbin/hixclient.exe?_IXDB_=compass&search-form=graphical/gt/gtindex.html&submit-button=search

and chose one tour that is of interest to you. Then read the text, and listen to the speaker.

Imagine you went to the Museum to see the exhibition. Finally, write an email message (about 150 words) to a friend telling him/her about what you found interesting about that exhibition.


You can begin in this way, for example:

Hi XXX,

Yesterday I went to see an exhibition at the British Museum entitled “A Kind of Magic.” It was interesting because there were lots of...


Page1 Page2 Page3 Page4 Page5 Page6