Paniting programs presentation

451 views

Published on

describes paint programs.

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
451
On SlideShare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
3
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Paniting programs presentation

  1. 2. Painting Programs <ul><ul><li>Paint programs create bitmap images made of pixels. </li></ul></ul><ul><ul><li>A bitmap (raster image) is an image made of pixels. </li></ul></ul><ul><ul><li>Greater pixel density gives greater resolution. </li></ul></ul><ul><ul><li>Resolution is defined as dots per inch (DPI) or by the number of pixel rows and columns (640x480). </li></ul></ul>
  2. 3. Compression <ul><ul><li>The longer the internet bandwidth, the faster the download time of a picture. </li></ul></ul><ul><ul><li>Bandwidth is the speed at which a computer can transmit information along a network. </li></ul></ul><ul><ul><li>Compression in graphic files is the process of reducing the size of an image. </li></ul></ul><ul><ul><li>Lossless compression does not change any pixel data. </li></ul></ul><ul><ul><li>Lossy compression reduces or changes some pixels while making the file smaller. It also distorts the image. </li></ul></ul>
  3. 4. BMP (Bitmap) <ul><li>Most common bitmap file is a BMP(bitmap) </li></ul><ul><li>Usually used in word processors </li></ul><ul><li>File is often quite large </li></ul><ul><li>Limited to 256 colors </li></ul><ul><li>Work well with Microsoft Windows </li></ul>
  4. 5. TIF/TIFF (Tagged Image File Format) <ul><li>File type works well in all environments (Even Face book!) </li></ul><ul><li>Files are quite large </li></ul><ul><li>Are NOT compressed </li></ul><ul><li>Used for high resolution </li></ul><ul><li>printing </li></ul><ul><li>Many cameras use TIFF </li></ul><ul><li>as their picture format </li></ul>
  5. 6. GIF (Graphic Interchange Format) <ul><li>Developed by CompuServe </li></ul><ul><li>Only uses 256 colors </li></ul><ul><li>File sizes are quite small </li></ul><ul><li>Used to create line </li></ul><ul><li>drawings, images with </li></ul><ul><li>transparent backgrounds, </li></ul><ul><li>and animated figures </li></ul>
  6. 7. GIF continued… <ul><li>GIF compression is lossless using the LZW (Lempel-Ziv-Welch) formula </li></ul><ul><li>GIF can be version 87a or 89a </li></ul><ul><li>Most users choose 89a for its ability to make the image transparent. </li></ul><ul><li>Both Photoshop and </li></ul><ul><li>Paint Shop Pro offer version </li></ul><ul><li>options </li></ul>
  7. 8. GIF continued… <ul><li>A GIF can also be interlaced or noninterlaced </li></ul><ul><li>Interlaced images load onto a web page in stages until max. resolution is reached </li></ul><ul><li>Noninterlaced images build from the top down until a complete image appears </li></ul><ul><li>Both Photoshop and </li></ul><ul><li>Paint Shop Pro offer interlacing choices </li></ul>
  8. 9. JPG/ JPEG (Joint Photographic Experts Group) <ul><li>Uses up to 16 million colors </li></ul><ul><li>Most digital cameras use JPG as their picture format </li></ul><ul><li>Allows you to choose the amount of compression you want </li></ul><ul><li>Standard encoding draws the image on the screen only when the complete picture has been transferred </li></ul><ul><li>Progressive encoding </li></ul><ul><li>displays the image </li></ul><ul><li>in stages </li></ul>
  9. 10. PNG (Portable Network Graphics) <ul><li>Retains 16 million colors </li></ul><ul><li>Has some valuable features </li></ul><ul><li>Not supported by all web browsers </li></ul>

×