Samacheer Class 7 Science - Visual Communication

Raster Graphics are created on the basis of PIXELS.
The photos taken by camera and the photos scanned by a scanner are of the Raster type.
When we enlarge this type of photos we could see the pictures as rectangular layers or grids.

The two dimensional 2D images have only the two dimensions – length and height. But three dimensional images (3D) have length, height and width. 3D images appear in front of our eyes like it happens in the real world.

S. No
Raster graphics
Vector graphics
1.
Raster graphics are created on the basis of Pixels
Vector graphics are created on the basis of Mathematics
2.
Raster File types are .png, .jpg, .gif, .tiff, .psd
Vector file types are .eps, .ai, .pdf, .svg, .sketch
3.
Software used to edit Raster Graphics is Adobe Photoshop
Software used for Vector Graphic Images – Adobe Illustrator, Sketch

Microsoft Photostory can be used to make videos using photos. First we have to upload
the photos and then select music for the video.
Step 1: Open the application of ‘Microsoft Photostory’. In that select ‘Begin A New Story’ and click on Next.
Step 2: Click ‘Import Picture’ in the next screen. Now, the files in our computer will appear. Select Saved pictures for video.
Step 3: Now we can input small text which is apt to the pictures. Then click on ‘Next’ and give animation to the videos. We can give audio effect also to these images. After finishing this click on ‘Next”.
Step 4 : To provide background music, we can select a music file through “Select Music” and click on “Next”.
Step 5: Next select a title for the story and select the place where it has to be saved in your computer. Then, through SETTINGS, change the format of the video.
Step 6: Now our video is ready to view. Click ‘VIEW YOUR STORY’. You can see your video now.